m o r e

So you want more? Pictured here are a bunch of different ROM types.

With the help of Dan Boris, we analysed the second one in the row, an EPROM holding32 in 1 by Atari Inc, 1988 (CX26163). It was found on a fleamarket and the origin is unknownas well as why (this) 32 on 1 is on an EPROM and how it came there. But it made a decent scan toanalyse.

  1. 64K EPROM chip2. Chip identification numbers3. The actual IC chip as seen   through the erase window4. Binary counter IC chip5. Inverter IC chip6. Card edge connector7. Printed Circuit Board (PCB)8. Capacitors9. Transistors     

You can see this is a 64K chip by the first number (2): "AM27C512". AM stands for AMD,the manufacturer, and 512 divided by 8 makes 64K. The other line stands for the speed of thechip (-175), DIP package (D) and the Commercial Temperature Range (C, the temperature range thatthe chip can operate under, in degrees Centigrade. The last number (85005AJ) is the ManufacturerDate, and states that it was made in 1985. Dates code are different for every manufacturer and theygenerally don't make public what they mean.
The IC chip (3) is holding the games (ROM Image). Now the Binary Counter Chip (4) takes care ofcounting which game is currently on, and which will be next when you switch the Atari on and off.The Capacitors (8) store an electrical charge to keep the counter chip "alive" whilethe power of the 2600 is cycled. The 2 small blue ones are de-glitching capacitors and help smoothout the power going to the IC chips. That is all there really is to it.

More ATARI 2600 carts turned inside out and exposed on the Inside-Out page, and more Die-Hard info on EPROMs and such on manufacturerAMD's Website: http://www.amd.com/products/nvd/techdocs/techdocs.html

Thanks again to Dan Boris for teaching me all about EPROM.

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