mirror of
https://github.com/Alex-Kw/Brain-Board-II.git
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263 lines
13 KiB
HTML
263 lines
13 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<!-- saved from url=(0035)http://www.willegal.net/appleii.htm -->
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<title>Brain Board</title>
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<meta http-equiv="Content-Type" content="text/html;
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charset=windows-1252">
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</head>
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<body>
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<h1 align="center">The Brain Board with Wozanium Pack</h1>
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<h1 align="center"><a
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href="file:///Users/mwillega/Documents/personal/web/willegal.net/appleii/Brainboard-assembled.jpg"><img
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style="border: 0px solid ; width: 800px; height: 554px;"
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alt="The Brainboard" src="Brainboard-assembled.jpg"
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hspace="10" width="800" height="554" vspace="10" border="0"></a></h1>
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<h3>The Brain Board</h3>
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See my <a href="appleii-fwboard.htm">firmware board page</a> for
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information on a prototype version of this board.<br>
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<br>
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The brain board is a firmware board for your Apple II/Apple II plus
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or Apple IIe computer. The board uses inexpensive and readily
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available 27c128 or 27c256 PROMs. Because of the denser PROMs used,
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6 sockets are replaced with one and the resulting size of the board
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is reduced to under 3 by 4 inches. The original Apple firmware board
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was able to replace motherboard ROM functionality with it<69>s own
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ROM<4F>s. This allowed an Apple II to have Applesoft in ROM or an Apple
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II plus to have Integer basic in ROM. A softswitch (flip-flop) is
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included which allows for switching between the firmware card and
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motherboard ROMs through software control. The board also includes a
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little known and seldom used capability that allows multiple
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firmware cards to coexist in the same system as long as they are in
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adjacent slots. Firmware cards were normally located in slot 0, but
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they could be located in any slot.<br>
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<br>
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Later on in time, a 16K ram (language) card was developed that had
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the same functionality, except the appropriate BASIC was loaded into
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the language card from disk when DOS was booted. The multiple card
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support was dropped.<br>
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<br>
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The base design of the Brain Board includes all the capability of
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the Applesoft/Integer Basic Firmware ROM board that Apple Computer
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released around 1978 including:<br>
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<ul>
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<li>a switch for enable/disable</li>
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<li>a software controlled switch (soft switch) for changing
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between motherboard ROMs</li>
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<li>firmware board ROMs jumper for enabling monitor ROM F8 - this
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was a solder pad jumper in the Apple design </li>
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<li>daisy chain enable functionality via DMA bus connections for
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multiple card support</li>
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</ul>
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In addition, I have added several enhancements in order to maximize
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usefulness of the board.<br>
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<ul>
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<li>The modified design will allow booting a ROM-less motherboard
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into DOS, which is not possible with the original firmware board
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27C256 PROMs allow support of two complete ROM images on the
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Brain Board. Images of both Applesoft and Integer BASIC with
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matching monitors could be installed and used from the single
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PROM.</li>
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<li>An extra soft switch is used to select whether the high or low
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half of the PROM is in use. This soft switch can be configured
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by external switch, through software control or by jumper.</li>
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<li>The Apple II peripheral bus I/O select signal is connected to
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the lowest 256 bytes of the PROM bank that is currently selected
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by the bank select flip flop. I/O select is connected to a
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different address depending upon the slot the board is located
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in. Slot 0 does not have a I/O select signal, so this feature
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cannot be used if the Brain Board is installed in slot 0. The
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starting address for these 256 bytes is computed by multiplying
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0x100 by the slot number and adding 0xC000. Thus slot 1 is
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0xC100, slot 2 is 0xC200, etc.<br>
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</li>
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</ul>
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<div style="text-align: center;"><big><br>
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</big>
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<h3 style="text-align: left;">Wozanium Pack</h3>
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</div>
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The low bank of the PROM provided with the Brain Board optionally
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includes a special program that will transform your Apple II into a
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operating facsimile of an original Apple 1 with 16K of expanded
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memory. This expanded memory was an authentic modification made to a
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number of original Apple 1s. If the Brain Board is installed in slot
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1, you will also obtain access to an authentic Apple Cassette
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Interface (ACI) driver located at address C100, just like the
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original Apple 1. Input and output to your transformed Apple is now
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limited to the keyboard, video and cassette interfaces, also just
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like an original Apple 1. Software in PROM is limited to a ported
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version of the orignal Apple 1 monitor and the latest known version
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of Apple 1 BASIC (the so called Huston Basic) which is located at
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the same address in memory (E000) as it would be located at, in an
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actual Apple 1.<br>
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<br>
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Your transformed Apple will be able to run most original Apple 1
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assembly and BASIC programs. Programs must either be keyed in
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through the monitor or loaded via the ACI (Apple Cassette
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Interface). No other options are standard, though you could add
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drivers for serial ports or other expansion cards, if you wished to.
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More details are provided in the manual.<span style="font-weight:
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bold;"><br>
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<br>
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</span>
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<h3><span style="font-weight: bold;">Example Wozanium Pack - User
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Driver</span></h3>
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The Wozanium Pack provides a capability for user device
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drivers for input and output. Applications that directly
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access the Apple 1 PIA for keyboard input may or may not access the
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hooks that are used to enable these drivers depending upon how they
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are implemented. Here is a simple example driver for the
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Super Serial Board (slot 2 only). This driver should be loaded
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into locations 6000. 605B using the cassette interface. Once
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loaded type 6000R to initialize the driver. Here is an <a
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href="serial6000.605BR_6000R.aif">AIF encoded version</a> of this
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driver ready for loading onto your digital music player. <br>
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<br>
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<small><small> PROCESSOR 6502<br>
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LIST ON<br>
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ACIASTAT EQU $C0A9<br>
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ACIADATA EQU $C0A8<br>
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ACIACMD EQU $C0AA<br>
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ACIACTRL EQU $C0AB<br>
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<br>
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READVECTOR EQU $BC02<br>
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WRITEVECTOR EQU $BC04<br>
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RETTOMON EQU $FF1F<br>
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<br>
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ORG $6000<br>
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<br>
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INIT<br>
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LDA #$2B
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;ODD PARITY, NO ECHO, RTS LOW/W NO INT, IRQ DISABLED, DTR LOW<br>
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STA
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ACIACMD ;<br>
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<br>
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LDA #$3E
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;1 STOP BIT, 7 DATA BITS, 9600 BAUD<br>
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STA
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ACIACTRL ;<br>
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<br>
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;SAVE OLD VECTORS<br>
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LDA READVECTOR<br>
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STA READRET<br>
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LDA READVECTOR+1<br>
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STA READRET+1<br>
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<br>
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LDA WRITEVECTOR<br>
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STA WRITERET<br>
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LDA WRITEVECTOR+1<br>
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STA WRITERET+1<br>
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<br>
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;OVERWRITE VECTORS WITH NEW FUNCTIONS<br>
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LDA #<READ<br>
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STA READVECTOR<br>
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<br>
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LDA #>READ<br>
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STA READVECTOR+1<br>
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<br>
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LDA #<WRITE<br>
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STA WRITEVECTOR<br>
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<br>
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LDA #>WRITE<br>
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STA WRITEVECTOR+1<br>
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JMP RETTOMON<br>
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<br>
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WRITE:<br>
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PHA
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;SAVE BYTE TO WRITE<br>
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WRITE2:<br>
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LDA
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ACIASTAT ;READ STATUS REGISTER<br>
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AND #$10
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;TRANSMIT REGISTER EMPTY?<br>
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BEQ
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WRITE2 ;WAIT FOR EMPTRY<br>
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PLA
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;CHARACTER TO WRITE<br>
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STA ACIADATA ;WRITE IT<br>
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; RTS
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; RETURN, WITHOUT DISPLAY<br>
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JMP (WRITERET) ; RETURN,
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AND DISPLAY<br>
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<br>
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READ2<br>
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JMP
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(READRET) ;ALLOW KEYBOARD INPUT TO OCCUR<br>
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READ<br>
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LDA ACIASTAT ;READ STATUS
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REGISTER<br>
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AND #$08
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;READ READISTER FULL<br>
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BEQ READ2
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;NO, WAIT FOR CHAR TO ARRIVE<br>
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LDA
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ACIADATA ;FETCH CHARACTER<br>
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ORA #$80
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;SET MS BIT - APPLE 1 ASSUMES THIS<br>
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READ3<br>
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RTS
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;RETURN<br>
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<br>
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WRITERET DC.W 1<br>
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READRET DC.W 1</small></small>
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<h3 style="text-align: left;">Video Demo of the Wozanium Pack</h3>
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See the first public demo of the "BRAIN BOARD" on my video
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podcast #24<br>
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<a href="http://www.willegal.net/feed.xml">http://www.willegal.net/feed.xml</a><br>
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<br>
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<h3>Follow My Blog Posts Related to the Brain Board/Wozanium Pack</h3>
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<a href="http://www.willegal.net/blog/?cat=14">http://www.willegal.net/blog/?cat=14</a><br>
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<br>
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<h3 style="text-align: left;">Brain Board with Wozanium Pack
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Assembly and Operations Guide</h3>
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Click <a href="bb-v5_3.1.pdf">here</a> to download Version 5.3.1 of
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the manual in PDF format.<br>
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<br>
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<h3 style="text-align: left;">Wozanium Pack Source Code</h3>
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Build with the 6502 DASM cross assembler.<br>
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Use the following command line:dasm a2a1emulv5_1.asm -DBLD4ROMBD=0
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-DHUSTNBASIC=0 -oa2a1rbh.o -la2a1rbh.lst<br>
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Included in this zip is<br>
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<ul>
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<li>a1basic-universal.asm - Apple 1 BASIC modified to
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run on Brainboard/Wozanium (note copyright at beginning of this
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file)</li>
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<li>COPYING.txt - GNU lincense</li>
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<li>a2a1emulv5_1.asm - Wozanium source code</li>
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<li>a2a1emulv5_1.lst - Listing</li>
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<li>a2a1emulv5_1.o - Object file</li>
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<li>a2a1emulv5_1.rom - 12K rom file that can be used with A2
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emulators, such as Virtual II.</li>
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</ul>
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Click <a href="a2a1emulv5_1.zip">a2a1emulv5_1.zip</a> to download
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Version 5.1.<br>
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<br>
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Also included in this zip package, is a ROM file suitable for
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emulators, such as Virtual II. This allows you to run and debug
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Apple 1 software in the Apple II emulator environment. Just select
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the .ROM file as the ROM for your machine and reset your virtual
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machine. Just as in the Brain Board, right arrow will clear the
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screen. Using the emulated cassette interface built into
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Virtual II, you can download AIF files of A1 basic and assembly
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language programs and run them in your emulated Apple II. Note
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that this ROM version does not include the ACI driver at C100, so
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you must enter the cassette driver by entering <20>D000R<30>, instead.<br>
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<h3>Obtaining Your Own Brain Board Kit</h3>
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I no longer sell Brain Board kits, but you can get your own boards
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made with the design files that can be downloaded. I will
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assume no liability for any use of the files. You are on your
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own. Do be aware of <a
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href="http://www.willegal.net/blog/?p=1880">this grounding issue</a>
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which I never resolved.<br>
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<a href="brainboard-rcva31.zip">download Gerber Files</a><br>
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<a href="brainboardva31.osm">download Osmond PCB Fil</a>e<br>
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<br>
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<br>
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<span style="font-weight: bold;"></span>
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<hr style="width: 100%; height: 2px;"><br>
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<div align="center"><font size="+2"><font size="+2"><a
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href="../../index.htm" target="_top">Back to Mike's Hobby
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Home Page</a> </font></font></div>
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</body>
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</html>
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