Hallo, I have some problem setting up the adressing jumper for an 8k eprom with the BASIC. The socket location is the u21 so the jumper for a rom 2364 would be B1 F4, the adress select for the 8k Basic would be K11-k12-k13-k14. but basic don't start . Some error in the jumper setting or I have to verify the eprom? thank you

Andrea
Italy

I don't know exactly what might be wrong, but this page tells us that modern 2764 have a different pinout to the historical 2364. Maybe that's the problem?

(Ahem: indeed, 28pins instead of 24, which would be obvious! Perhaps it's helpful anyway.)

I had a look at the SYM-1 Reference Manual, specifically
* page 37 (page 4-15) shows the memory system
* page 49 (page 4-27) shows the jumpers
* page 52 (page 4-30) describes jumper usage for rom sizes
* page 53 (page 4-31) describes jumper usage for rom placement

U21 is connected to signals S11, S12, S13 which connect to jumpers B, F, K. B1 F4 gets you A11 and A12 on pins 18 and 21. S13 is \CS, jumping to K-11 and K12, K13, K14 (wire-OR) should put an 8k ROM at C000.

All that confirms what you did: so perhaps it is worth checking the ROM. Is the machine able to run the monitor so you can read out some of the ROM content, or does it completely fail to do anything with the ROM installed?