You FPGA guys were so nice to me when I asked questions about decapping ICs and reverse engineering PALS...I have one more for you. :)
I want to reproduce Steve Wozniak's video circuit from the Apple 1. I can't reproduce it part for part since some of the parts are discontinued, but it could at least be logically accurate.
The datasheets I'm looking for are:
2504 - 1024x1 DRAM
2513 - Character generator rom
2519 - 40x6 Static Shift Register
The 2513 from the Apple 1 is marked like this:
S7625
2513N CM2140
The 2519 from the Apple 1 is marked like this: S7640
2519B
The 2504 from the Apple 1 is marked like this: S7632
2504V
1404A
I downloaded
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and on page 283 it says the 2513 CM2140 is a "New ASCII Character Generator, Upper Case, 7x5, Horixontal Scan".I'd really like to find this chip to find the exact dotpattern of the font. If anyone knows how to help me that would be great. I will be keeping track of the project at
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but please respond to this thread directly. (I just mention the web address for the web archives...)Thanks, Grant