The Commodore SuperPET SP9000 -- Wow, there are not one, but TWO revisions of the SP9000 expansion board. The older is a double expansion board, feeding off the main power supply directly, having 16 or so memory chips to make up the 64K expansion, and actually double-deckered over the main board. The newer (the one I use) is a single integrated expansion board drawing power from the little 5 pin port near the back of the main board, and having only 8 memory chips. This stuff is merely amusing, but not perplexing. What I don't understand though, is the last difference between them. The older board had, mounted on the right hand side, a second pair of switches in addition to the standard "Read/RW/Prog" and "6502/6509/Prog" switches. These other switches were two-position instead of three, and one was marked "RAM/ROM" and the other was marked with the name of a chip socket, and something like "disable, enable". These switches were attached in two places. One was to a pair of chips in the expansion sockets of the main board. The other was to an extra 3 pin port on the lower of the two expansion board (one not present on newer version). Can someone with an older superPET tell me what this extra pair of switches does? I couldn't tell myself because there is apparantly something wrong with the memory on the expansion board -- none of the languages would boot, but would lock up the computer. BTW, why doesn't the standard 64K expansion software work with a SuperPET? Is it addressed differently? The Commodore B500 -- Disappointing. I imagined a 64K B128 with an older BASIC in there. Instead I got a B128 -- 128K -- BASIC 4.0. The only difference I can see is the eprommed kernal and BASIC chips instead of the factory run chips. Anyone have any different experiences with this machine? At least it came with the box.. - Bo - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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