What floppy controller mod is this? STF

32bitminus · Post by **32bitminus** » Wed Jan 04, 2023 8:15 pm

Was cleaning out my old bin of stuff to sell some things and found this. Appears to be a diode on the floppy controller?

: PXL_20230104_185424441.MP.jpg (378.22 KiB) Viewed 996 times

Post by **exxos** » Wed Jan 04, 2023 8:29 pm

Drops the voltage to the chip to "solve" bus noise issues. It was "common practice" on the IMP DMA chips and IMP shifters. Though don't recall ever seeing a diode on the 1772 itself. These were "factory bodges" done by Atari.

32bitminus · Post by **32bitminus** » Wed Jan 04, 2023 8:42 pm

I knew you would know! it is crazy how many revisions these systems went through

Post by **exxos** » Wed Jan 04, 2023 9:22 pm

32bitminus wrote: Wed Jan 04, 2023 8:42 pm I knew you would know! it is crazy how many revisions these systems went through

Yeah absolutely. Also why I ultimately gave up and designed a new motherboard. It was just easier

exxos's Atari, Amiga & retro forum

What floppy controller mod is this? STF

What floppy controller mod is this? STF

Re: What floppy controller mod is this? STF

Re: What floppy controller mod is this? STF

Re: What floppy controller mod is this? STF