I've been scouring the manuals to figure out how set the jumpers to get a pair of 2732 chips with BASIC into my SYM-1.
Does anyone have a source for a SYM-1 schematic? There's one in the "theory of operations" manual PDF file, but it's split over several pages and missing information ... and, of course, some of the missing area covers the jumpers and select logic for the ROM sockets.
With a 4K EPROM in U21 (P1) and U22 (P2), I'll need to configure three signals in each socket:
Code:
S11 (U21 pin 18, #Enable)
S21 (U22 pin 18, #Enable)
S12 (U21 pin 21, A11)
S22 (U22 pin 21, A11)
S13 (U21 pin 20, #Gate)
S23 (U22 pin 20, #Gate)
What I've got so far is this:
Code:
11-K and 12-K to get #Gate to the $C000 and $C800 decoder outputs
13-L and 14-L to get $Gate to the $D000 and $D800 decoder outputs
1-F to get A11 to U21
1-G to get A11 to U22
2-B to tie #Enable low for U21
2-C to tie #Enable low for U22
Does that look right?