Folks may remember, from last year, the Tri Mod CBM Adapter. Site is (was) at https://dl2dw.de/en/diy-projects/commodore/50-trimod-cbm-adapter <https://dl2dw.de/en/diy-projects/commodore/50-trimod-cbm-adapter> (sadly, looks like site is down for maintenance) We discussed it: http://cbm-hackers.2304266.n4.nabble.com/IEEE-488-adapter-for-1541-td4668108.html And it's been discussed at Forum64 as well: https://www.forum64.de/index.php?thread/91569-1541-to-ieee488-trimod-adapter/ As noted in the CBM-Hackers thread, I started a similar project, but was not able to finish before the other one came out. Still, I wanted to finish mine, which I'm pleasantly surprised seems to work on first design: https://github.com/go4retro/Nu2031/ I'm working to reduce board size, in hopes of fitting in the 1541-II, and will need to rrdo the PCB. As I do, I'm wondering if there are features to consider. It might be possible to include the parallel port connection on the revised PCB, but I'm also wondering if there's value in adding some capability to auto-switch from 1541 to 2031 or vice versa modes. Right now, it's a physical switch. (I was thinking some specific data on PORT A and PORT B to "knock" for access. I also would like to revisit Spiro's note in the cbm-hackers thread about making the ROM compatible with the 4040 (though, the thread was confusing. It sounds like later 1541s are compatible with the 2031 and 4040, and I used a -05 ROM and Andre's patching routine to create the pseudo-2031 ROM. Thus, it's unclear if the resulting patched ROM is 4040/2031 compatible or not. Jim -- Jim Brain brain_at_jbrain.com www.jbrain.comReceived on 2020-10-21 15:00:03
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