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‎public/cbmhw/c64csa/c64csa.png

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‎public/cbmhw/c64csa/c64csa.ps.gz

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‎public/cbmhw/c64csa/c64csadesc.txt

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Adapter Commodore 64 <-> CS/A bus
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---------------------------------
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whatsit : Adapter to use CS/A cards in a C64
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I/O : window to CS/A bus at $de00-$de7f and VIA 6522 at $de80-$deff
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Mem : --
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This is an adapter to make most of the CS/A bus cards available to the
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Commodore 64 home computer. It also serves as an example on how to
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use the CS/A bus on other 6502-based computers.
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The C64 has two available I/O areas on the expansion port, $DE** and $DF**.
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Preferably $DE** is used.
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IC1 buffers the data bus to the card. IC2 buffers the available address
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bus lines A0-A7. A part of IC3 buffers the R/W line.
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IC7 (together with another part of IC3) delays the rising transition
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of the system clock Phi2 by approx. 100ns. This makes the active part
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of Phi2 (high) shorter, but provides that the address lines are already
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stable when Phi2 goes high (during Phi2 low the Video chip has the bus
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and switching is too slow). This is needed for chips like the 6522 that
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samples the address bus at the rising flank of Phi2.
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The CS/A bus has a line 2Phi2 that can be used as /RAS signal for dynamic
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RAM. It is produced with IC4 (should be a slow version, no 'LS or faster)
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and IC5.
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As only 8 address lines are available, we need to produce more
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address lines for the full CS/A bus. Therefore the address line
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A7 is used to select a 6522 that produces the bus address lines
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A7-A19. Also it switches between I/O space and Memory space on the
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CS/A bus. This is implemented with IC6.
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Thus we have a window of 128 byte to the CS/A bus address space,
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where the window can be moved with VIA PA and PB.
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‎public/cbmhw/c64csa/c64csaparts.txt

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Parts list for C64-CS/A adapter, version 1.0
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--------------------------------------------
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IC 1 74LS245
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2 74LS541
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3 74LS08
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4 7404
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5 74LS86
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6 74F139
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7 74LS74
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8 R6522A
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P 1 C64 expansion port card edge connector
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2 CS/A bus connector, female
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‎public/cbmhw/c64csa/index.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN">
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<html><head><base target="_top">
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<meta name="author" content="Andr&eacute; Fachat">
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<meta name="robots" content="noindex">
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<meta http-equiv="content-type" content="text/html; charset=iso8859-1">
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<meta name="keywords" content="C64, bus adapter"> <meta name="description" content="CS/A bus adapter for the C64">
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<title>CS/A adapter</title>
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<link rev=made href="mailto:[email protected]">
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</head>
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<body bgcolor="#ffffff" text="#000000" link="#0000ff" alink="#ff0000" vlink="#220088">
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<h1>C64 &lt;-&gt; CS/A bus adapter</h1>
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<h2>(C) Andr&eacute; Fachat (<a href="mailto:[email protected]">[email protected]</a>) [file:///home/fachat/Current/WWW/8bit/home-8bit/html]</h2>
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<p>
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This is the description of an adapter to use most CS/A boards in a C64.
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A lot of CS/A boards, including a video card, serial interfaces, floppy
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controller and an SCSI card can be found on the
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<a href="../../csa/index.html">CS/A65</a> homepage.
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Below is the schemactics for a <em>C64 SCSI card</em>, derived from this
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adapter and the CS/A SCSI card.
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</p>
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<div class=disclaimer>
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<hr class=disclaimer>
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<H1 class=disclaimer>Disclaimer</H1>
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<P class=disclaimer>Before you go on, you should know that all this stuff
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comes with <strong>no warranty at all </strong>. Of course this hardware is <strong>not</strong>
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to be used in any important or even life-critical systems.
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The hardware schematics and software
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are provided 'as is', without warranty of any kind. The entire risk as
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to the quality and performance of the hard- and software is with you. Should
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the hard- or software prove defective, you assume the cost of all necessary
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servicing, repair or correction.</P>
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<hr class=disclaimer>
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</div>
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<H2>Distribution</H2>
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<p>
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<font size="+1">
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Warning: This computer system is free for <strong>NON-COMMERCIAL</strong>
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purposes only! If you want to do something useful with it, please
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contact me. Also if you like to produce PCBs, or want to earn money
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with it, please contact me first.
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The disclaimers in section 11. and 12. of the GNU public license apply.
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</font></p>
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<p><hr>
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<H2>Description</H2>
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The interface itself is, in fact, pretty simple.
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It is a board that is plugged into the C64 expansion port. On the
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other side it provides a socket for a CS/A bus card.
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Two things have to
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be considered for the schematics:
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<ul>
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<li>The C64 Video chip releases the bus with rising Phi2. This is too late
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for the 6522. Thus the rising edge of Phi2 must be delayed to the
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CS/A bus, to be sure. The CS/A bus is specified to run up to
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2 MHz, so there is no speed problem.
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<li>The I/O area in the C64 is 256 byte only. To cover the whole
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CS/A bus address space (1M memory and 4k I/O) additional address
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lines have to be generated. This is taken care of with a VIA 6522
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on the adapter. More in the <a href="c64csadesc.txt">description</a>.
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</ul>
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<p>schematics as <a href="c64csa.png">c64csa.png</a> or
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<a href="c64csa.ps.gz">c64csa.ps.gz</a> (gzip'd postscript),
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<a href="c64csadesc.txt">description</a>,
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<a href="c64csaparts.txt">parts list</a>
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</p>
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<hr><p class=endofpage>
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Contents last modified Jan 13 12:44 |
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Go to <a href="../../index.html">Homepage</a>
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</p>
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</body>
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</html>

‎public/cbmhw/index.html

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<html><head><base target="_top">
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<meta content="André Fachat" name="author">
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<meta content="text/html; charset=iso8859-1" http-equiv="content-type">
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<meta content="Commodore 8-bit hardware modifications" name="description">
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<meta content="Commodore, 8-bit, hardware" name="keywords">
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<title>www.6502.org: Andr&eacute; 's CBM hardware modifications</title>
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<link href="mailto:[email protected]" rev="made"></head>
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<body alink="#ff0000" bgcolor="#ffffff" link="#0000ff" text="#000000" vlink="#220088">
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<img align="left" alt="logo" src="logo2.png"><A HREF="http://www.6502.org"><br>
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<h1>Andr&eacute; 's CBM hardware modifications</h1><h2>(C)
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- Andr&eacute; Fachat
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&lt;<a href="mailto:[email protected]">[email protected]</a>&gt;
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[<a href="http://home.arcor-online.de/andre.fachat">Homepage</a>]</h2>
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<p>
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On these pages you will find a number of hacks I applied to my Commodore
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8-bit equipment. Some of them are designed by me, others are taken
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from magazins or the web. If there are no schematics available and
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you desperately need them, mail me and I will (probably) write them
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up and put them here.
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</p><hr><h3>RS232</h3>
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The RS232 interface is a standard interface in the PC world and I use
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it as a terminal connection to my multitasking OS for the C64 or the
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CS/A65 or Gecko computers.
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<ul><li><strong>C64-1</strong>
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:
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The userport of the C64 can do more than the approximately 2400 baud
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the original kernal software can handle. With a small modification, invented
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by Daniel Dallmann, it can do 9600 baud. See
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<a href="http://www.zimmers.net/anonftp/pub/cbm/documents/projects/rs232/rs232-userport-9600.zip">http://www.zimmers.net/anonftp/pub/cbm/documents/projects/rs232/rs232-userport-9600.zip</a>.<br><br></li><li><strong>C64-2</strong>
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:
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Originally I built a 6551 interface for the C64 that was mounted between the
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SID and its socket in the C64. Nevertheless, this IC is crap compared to
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the UART 16550A with 16 byte FIFO, especially if you use a
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multitasking OS like my <a href="../osa/index.html">GeckOS</a>.
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So I modified the interface to use an UART. Find the description, schematics
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and some source code in
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<a href="http://www.zimmers.net/anonftp/pub/cbm/documents/projects/rs232/c64-uart-1.tar.gz">c64-uart-1.tar.gz</a>.<br><br></li></ul><hr><h3>C64 Modifications</h3>Besides the above modifications I did some more.
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Also the original C64 kernal is not very comfortable. So I decided to do some
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modifications to it.
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<ul><li><strong>EPROM</strong>
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:
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First of all, to modify the kernal, you have to replace an 8k ROM chip.
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As, normally, you will not have a ROM, but an EPROM chip, you need an
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adapter. I originally used the Kernal switch adapter of the 64er
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magazin. However, as I am about to overhaul all my CBM devices
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now, I guess I am doing my own one (where all kernals are in one
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EPROM only, saving place and soldering...).
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Wait for the schematics coming soon (I hope).<br><br></li><li><strong>Kernal</strong>
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:
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The software to modify the ROM is a bit of a mess, because it is
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quite old and you have to fit the new code into the holes made by
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removing the tape and/or the old RS232 code.
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Find them on my page with the <a href="kernal/index.html">new C64 kernals</a>.
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I hope I find the time to clean that up a bit.
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It includes drivers for the CBM IEEE488 interface, an UART 16550A
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RS232 driver, function key mapping and a DOS wedge.<br><br></li><li><strong>Burst mode</strong>
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:
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To use the burst mode of the VC1571 in my C128D
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I implemented some schematics to connect the CIA shift registers
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with the IEC bus. I used it in the BDOS
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program, that reads PC disks with the VC1571 and runs on the
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C64 or C128.
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Sorry, no schematics at this time.<br><br></li><li><strong>Modules</strong>
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:
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To be able to switch the IEEE488 ROM off when I like it,
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I built two switches into the C64, that could set the <code>EXROM</code>
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and <code>GAME</code> line to either open, GND, or the module.
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Sorry, no schematics at this time.<br><br></li><li><strong>CS/A65</strong>
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:
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I have built an interface for the C64 expansion port
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to use all the memory and I/O cards of the
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<a href="../csa/index.html">CS/A65</a> computer - which includes
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another video card, extra RAM, IEEE488 and SCSI interfaces.
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For the SCSI interfaces see the <a href="../scsi/index.html">SCSI-64</a>
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pages also.
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For more on the adapter see the <a href="c64csa/index.html">C64-CS/A</a> pages.<br><br></li></ul><hr><h3>VC1541 Modifications</h3>My old VC1541 (a really early one in a white case, fitting the color of
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the VIC20 and not the color of the C128 like later white versions)
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really got some history. First I had speeddos installed, later I
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built the IEEE488 interface into the drive. Then I experimented
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with a DOS-1 (670 blocks free) and a 2MHz modification.
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Also I disabled the original power supply and use a PC power supply.
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I will try to get these things out of my archives and prepare them
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for the web (actually now I don't even remember whether it worked at all...).
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<ul><li><strong>Power supply</strong>
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:
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I removed the power regulators and used a PC-style
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power supply instead.
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Sorry, no schematics at this time.<br><br></li><li><strong>&gt;Write-protect</strong>
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:
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With this switch you could remove the write
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protection of a protected disk. This is a fixed switch, so it has to
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be set back to normal when a disk is changed, to make the VC1541
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recognize the disk change.
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Sorry, no schematics at this time.<br><br></li><li><strong>LED</strong>
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:
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I removed the power LED and used a two-colored
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LED in the drive only to indicate power and activity (green is idle,
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red is active/error)
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Sorry, no schematics at this time.<br><br></li><li><strong>2 MHz</strong>
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:
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If you use the IEEE488 bus (and not the time-critical serial
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IEC bus) you can speed up the drive - I thought. I tried but yet no
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success.
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Sorry, no schematics at this time.<br><br></li><li><strong>DOS</strong>
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:
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I experimented a lot with the VC1541, but currently only
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the IEEE488 DOS is installed. I see whether I can get the other stuff
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out of the archives.
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<br><br></li></ul><hr><h4>Disclaimer</h4>All Copyrights are acknowledged.
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There is no warranty of any kind attached to the information herein.
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You may use this information for NON-COMMERCIAL use, unless where the
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GNU Public License applies. Then its conditions hold.
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<hr>Contents last modified 15 June 2000
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</body></html>

‎public/cbmhw/kernal/MYCOPYING.ASC

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Copyright notice Andre Fachat
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-------------------------------------------------------------------------
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[email protected] 24.Nov.1995
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0. Scope
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This is the Copyright notice for the package you found this notice
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in. It applies to all the files and Programms in this Package. It
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states the conditions for copying and use of the package, as well as
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the warranty.
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You may not copy, modify, sublicense or distribute the Package except
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as expressly provided under this Notice.
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The Copyright is held by
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Andre Fachat, Nussbaumer Winkel 22, 51467 Bergisch Gladbach, Germany.
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[email protected]
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1. Warranty
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This program is licensed free of charge so far, so that there is no
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warranty for the program at all. The package is provided "as is", without
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warranty of any kind, either expressed or implied, included, but not
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limited to, the implied warranties of merchantability and/or fitness
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for a particular purpose. The entire risk is with you! Should the
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program prove defective, you assume the cost of all necessary
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servicing, repair or correction.
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If any damage arises from the use or inability to use the program,
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including, but not limited to loss of data or data being rendered
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inaccurate, or the failure of the program to operate with other
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programs, you are on your own!
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You are warned.
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2. Copying
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You may copy and distribute verbatim, unchanged copies of the Package in
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its whole, in any medium, provided that you conspiciously and appropriately
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publish on each copy an appropriate copyright notice and disclaimer
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of warranty.
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Keep intact all the notices that refer to this Copyright notice and to the
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absence of any warranty and give all the recipients of the Package
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a copy of this License along with the Package.
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You may charge a fee for the physical act of transferring a copy.
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3. Usage
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You may use this Package freely for any non-commercial use. This includes
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any private and scientific use, as long as you do not make money with it.
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However, if you like this program, and use it regularly, you may want to
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consider sending me some amount of money, to support the development
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of this program in special and the idea of free software in general.
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Please contact me for further details.
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If you want to make money with it, i.e. make money from pure distribution
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of the program, or benefit financially from the use of the program in
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any kind, please contact me for regulation of license fees.
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4. Epilogue
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If you are interested in additional documentation/source code/new versions,
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or you want to distribute changed versions, use it commercially or want
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something else not allowed with this notice, feel free to contact me
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(Address see above).
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Bugreports and -fixes are welcome!
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‎public/cbmhw/kernal/bs-l.s07

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‎public/cbmhw/kernal/bs-l.s07.txt

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10000 sys7*4096:.OPT OO
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10005 *=$33C:Z0 =$FC:Z1 =$FE
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10010 LDY #0:STY Z0:LDX #$20
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10020 LDA #$E0:STA Z0+1
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10040 L1 LDA (Z0),Y:STA (Z0),Y
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10050 INY:BNE L1:INC Z0+1
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10060 DEX:BNE L1
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10070 LDA #$A0:STA Z0+1:LDX #$20
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10080 L2 LDA (Z0),Y:STA (Z0),Y
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10090 INY:BNE L2:INC Z0+1
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10092 DEX:BNE L2:RTS
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10099 .end
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10100 sys828:clr:rem CLR LABELS
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10105 rem ****************************
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10110 sys7*4096:.OPT OO,P
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11000 *=$E4B7
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11010 LTEXT LDX #0
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11020 L0 LDA TEXT,X
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11030 STA $0277,X
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11040 INX
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11050 TAY
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11060 BNE L0
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11070 STX $C6
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11080 RTS
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11100 TEXT .BYT "L","<shift-o>",34,"B","*",13
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11110 .BYT "R","<shift-u>",13,0
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12000 *=$FF7D ; RESET ROUTINE to BOOT
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12010 JMP LTEXT
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19000 *=$E1D9; defAULT load/save ADDRESS
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19010 LDX #8
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20000 .end

‎public/cbmhw/kernal/c64bs2.lzh

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