VOGONS


First post, by Gandalf 75

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Hey guys does anyone here have an idea what these might be?
One is full of memory banks, the other one: no clue

Reply 3 of 5, by Grem Five

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keenmaster486 wrote on 2023-07-13, 15:13:

Yep I don't think I have seen a 5160 that didn't have one of these in slot8. Both of my XTs had one in them. ( one an earlier model 5160 and one a very late model 5160 ).

Reply 4 of 5, by mkarcher

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Tiido wrote on 2023-07-13, 14:34:

One with the big DIP40 chip is a COM port card, the other is a RAM expansion for some XT type machine.

The RAM expansion card has 256K in Bank 1, and 64K in both Bank 1 and Bank 2. The card is extremely likely configured to extend a 256KB PC/XT mainboard (both the 2nd generation PC mainboard and the XT mainboards had up to four banks of 64K, yielding 256KB total) to the maximum "conventional" memory amount of 640KB.

Reply 5 of 5, by mkarcher

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Grem Five wrote on 2023-07-13, 16:25:

Yep I don't think I have seen a 5160 that didn't have one of these in slot8.

According to -0°, you need to set the single jumper if the card is fitted in slot 8 (to drive the "CARDSLCT" line on contact B8). As the card on the photo doesn't have the jumper set, it is likely not directly pulled from slot 8 in a 5160 board. That jumper shouldn't be set if the card is fitted into an AT or newer machine, because ISA contact B8 is 0WS meaning in AT-class machines.