Since I do own a 3K RAM expander, which IIRC uses the same PCB, I'd like to do the following mod:
- Soldering a 2732 EPROM in the upper place, with Hypra System (a floppy speeder),
- Soldering an 8K or 16K RAM chip in the other place, which should appear in BLK1 (and BLK2),
- modifing the PCB to get both chips working.
I'd produce a special version of Hypra System which places the transfer buffer into the area of $0400 .. $04FF. There will be no harm for BASIC, as the 3K gets deactivated anyway by the 8K or 16K RAM. It's still possible to revert to the standard 3K RAM expansion with POKE642,4:POKE644,30:POKE648,30:SYS64818, thereby deactivating Hypra System.
Has someone here done a similar mod?
Greetings,
Michael
Update: I found this article on Zimmers: Page 1, Page 2, and Page 3. It however states using the 2732 causes "problems", and it doesn't mention populating the sockets with RAM. Well, I'm not afraid cutting traces, and re-wiring the PCB.
![Wink ;)](./images/smilies/icon_wink.gif)
Update 2: In case you're wondering what became of this project, look here: VIC-2020 MINIMON.
![Mr. Green :mrgreen:](./images/smilies/icon_mrgreen.gif)