HP integral , 82297a

Alas not me. I've upgraded an HP9816 mainboard from 256K to 1M (and for that matter an HP42S from 8K ro 32K), but that's all. However, my Integral came with a 1M memory board which claims to be an HP82916 (PCB 82916-60001). No, there will amost certainly be some links to move too. If nothing else, you need to inclesae the address range the card will respond to, and change the ID byte so that the card so that the system firmware knows it's a 1M card and configures its address appropriately. The board I have could clearly be fitted with 1 or 2 banks of either 64K or 256K bit DRAMs (all chips have to be the same type). There are many links on the board, as follows : W1, W2, W3 set the size of each bank (one link only must be fitted) W1 : 2 off 64K bnaks (256K bytes) W2 : 1 bank only (128K bytes or 512K bytes) W3 : 2 off 256K banks (1M bytes) W4-W9 (6 links) set the size of address range the card will occupy : W4 : A17 is 'don't care' in card selection W5 : A18 is 'don't care' in card selection W6 : A19 is 'don't care' in card seelction W7 : A17 matters W8 : A18 matters W9 : A19 matters Allowable settings : W7, W8, W9 : 128K bytes W4, W8, W9 : 256K bytes W4, W5, W9 : 512K bytes W4, W5, W6 : 1M bytes W10 : CAS jumper If 64K chips are used, then U45 ('157 mux) may be omitted, in which case fit W10 to link CAS/ from U47 (TMS4500) to the CAS logic. If U45 is fitted, W10 must be out. W11-W16 : Card ID jumpers W11 : ID bit 2 = 1 W12 : ID bit 1 = 1 W13 : ID bit 0 = 1 W14 : ID bit 2 = 0 W15 : ID bit 1 = 0 W16 : ID bit 0 = 0 I don't know all legal settings for these jumpers (they are simply read by the irmware, there's no obvious way to deduce their function from the schematics). I can tell you that a 1M card has W12, W13, W14 fitted. The first version of my Integral schematics is on the Australian museum site. This version is know to have errors (in the address decoder circuit on logic board A), but I think the RAM PCB diagram is correct. -tony