Found these inside a non-working 71B
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03-14-2018, 04:20 PM
Post: #85
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RE: Found these inside a non-working 71B
(03-13-2018 07:17 PM)J-F Garnier Wrote:I would be interested in actual documentation of the chip as well.(03-13-2018 06:19 PM)Paul Berger (Canada) Wrote: Reading a little more about the memory configuration you could have a RAM module that contains more than 32K bytes the 64K nibble limit is for an individual chip but a module could contain more than one chip, ...The HHP card reader RAM modules (made of 32K boards) can be configured to create a 64K port from two boards. See here for instance (the link to the file is dead, use this instead). I will have to try that 64K mod I have a 128K module in pieces right now because the SRAM was bad on one of the boards, that is fixed now, at least I ran diags for about 18 hours and it did not find a problem. I was not so lucky my bad SRAM was was on the base board in the middle of the stack and had more than one bad chip, it is now a single 32K SRAM. I should look and see if the later modules that used a single 32K SRAM instead of 4 8K have a similar arrangement, if not I can always lift the pin and ground it. Paul. Is that your document? I can fill in more of the pinout of the 1L?4 chip if you wish. |
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