This board replaces the 6 original ROMs (D0,D8,E0,E8,F0,F8) on the motherboard.
The board is compatible with Apple II, Apple II+, Apple II
Europlus. (Note is is not compatible with J-Plus, send message to me for J-Plus version).
You get two replacement ROM images, one with exactly the same content as your original ROM’s containing AppleSoft Basic, and another ROM with the original Apple II Woz Integer Basic plus also a few diagnostic tools.
The 32Kx8 EPROM on this board contains 2 ROM images or banks, selectable with a jumper.
The first bank (Jumper ON) contains the exact same contents as the original ROM’s, the five Applesoft BASIC ROMs D000, D800, E000, E800, F000 and the auto start boot ROM F800.
The second bank (Jumper OFF) contains the original Apple II Woz Integer BASIC and also includes Inspector and Watson, Disk and Memory debug tools/utilities, see photo screenshots (it also contains a duplicate copy of the auto start boot ROM F800)
The manuals for Inspector and Watson are available in PDF form if you do a google search.
See the memory map of the Eprom in one of the attached photographs.
To run Inspector and Watson, make sure to be in Integer Basic (jumper removed on card) and then to start Watson, do a CALL -12288 or type D000G in the monitor. Watson is in the D0 rom and the Inspector is in D8.
Note on INTEGER BASIC: When booting the INTEGER BASIC bank (jumper removed) you first boot into the monitor program. To actually start the BASIC, you need to press CTRL + B and then RETURN.
There is a listing on ebay selling this software for $400. . https://www.ebay.com/itm/388917585965
There are also a few photos that show the process and tools used to make the actual ROM contents, should you want to make your own ROM's.
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There are two physical versions of this ROM replacement board available on Ebay.
The Classic version and the Mini version. (See photos attached)
They are both functionally identical.
The Classic version uses all 1970’s technology, through hole mounted TTL IC’s in Sockets, just like the rest of your motherboard is built.
The Mini version uses modern non-through hole SMT technology to mount the IC’s directly on the board without the use of sockets. Because of this more modern technology, the board size is smaller.
Everything else is identical between these two versions.
This is the smallest board of this replacement ROM you will find on the internet.
Installation of the ROM card:
First remove all the six ROM’s from the mother board and also the IC at location F12.
The board plugs into the D0 socket and also into the socket at location F12 (you have to remove the IC there (74LS138).
There are many detailed documentations on the web available to assist you. See some links on one of the photos.
Take your time to make sure all the pins are aligned before putting pressure on the board to seat it. Use a flashlight, small mirror or a good pair of magnification glasses to look at the socket.
WARNING: The board will obstruct installation of expansion
cards longer than Apple Disk II controller into slot 6 (see photos)
(Note, on most of the ROM cards available
on the internet it blocks both slots 6 and 7 and slot 7 is a key slot
for Video cards, see photos)
One more thing: (where did I hear that before?)
This board has small gold plated pins of only 0.5mm diameter to plug into your Apple II mother board.
These are the thinnest pins available and will not damage
your precious mother board sockets. (see photo)
Some other ROM boards have round 0.6mm pins or square pins of 0.65mm (normal header pins, like the one on this board for the Jumper).
The EPROM socket is also gold plated, round machined pins that are of high quality compared to standard IC sockets. Should you want to remove this EPROM to modify its contents then you have nothing to worry about. You won't find this product with the same price and quality elsewhere.
The board can contain a 27C256 EPROM or a 27E257 EEPROM, both are 32Kx8 ROM memories. If you have a preference either way, send me a message before you buy.
Please be aware that the software contained on
the Apple II ROMs is still under license by Apple! If you own an original Apple
II then you are implicitly licensed to use the software in the ROM of that
machine.
Under no circumstance should you use any Apple II ROM image if you are not
legally entitled to do so.