drj1736@ritvax.isc.rit.edu (JACOBS, DR) (12/03/90)
I am desperately seeking help!! I own an Original Tandy 1000 i recently upgraded the memory to 640k. one problem though... on the memory upgrage board there is a small jumper wire that connects 2 of 4 pins. this has to be moved from pins 1&2 to another set.... DOES ANYONE KNOW WHICH 2 PINS THIS JUMPER GOES ON FOR 640K???? confused, ThE sLeEpInG<>DeMoN P.S. CALL ... the best BBS in the Rochester area!! CALL OBLIVION ]I[!!! (716)-475-3178
yetsko@interlan.interlan.com (Mike Yetsko) (12/05/90)
Depends on what memory board you have. Is it a board with 64K chips, and you added a second board? Or is it a single memory board with 256K chips and a double row of pins for a header connector right near the card-edge connector (i.e., a "PLUS" board)? If it is a "PLUS" board, the jumpers are labeled 64/256 for the left, and 256/512 for the right. I will have to check, but the left jumper is for selection of 64K cs 256K RAM chips. This was so Tandy could have a 128K memory board for early HD system. If you have 256K chips, then you can have either 256K or 512K, depending on if you have one or 2 rows stuffed. If you were asking about the physical orientation all jumpers (you should have little push on shorting blocks, NOT a wire jumper) is vertical as the boards are plugged into the chassis. I have both boards as home, so I can check. But what board(s) are you working with, and what is on them? Mike Yetsko