I recently acquired an A4000D, Rev B motherboard in amazing condition. It was restored very nicely and was working great (notice "was")
Well, it actually is still running great with a small caveat. I can't seem to get the floppy drive configured properly. Background:
- The system came with a CF IDE disk with OS 3.1 and 3.9 installed with 3.1 ROMs.
- It had a CD drive.
- It had a stock 68040 Amiga 3640 CPU card.
- It had a 256 Mb RAM card (Individual Computers).
Booted, ran everything great.
I did the following:
- Added a MTN ZZ9000 RTG card and audio card.
- Installed 3.2.2 ROMs.
- Installed the new A3660 CPU card.
- Configured a new CF card with OS 3.2.2.1.
The PSU also happened to blow up (see here:
https://forum.amiga.org/index.php?topic=76195.0). I repaired the PSU and the system seemed to be ok until I reconnected the floppy drive.
After reconnecting the floppy and CD ROM drive, I got a software error during startup. I had NOT changed any jumpers or anything other than installing the 3660, ZZ9000, and ROMs. I read the manual and I have to believe I'm not understanding something I thought I did understand. Right now, jumper J351 is "open" and jumper J352 is set to 1-2 which I understand is an internal DF0: (Changing it to "EXT" didn't really change much).
I have been able to get it booting and recognizing the floppy, sort of. Here are some details of what I've investigated and identified:
- I disconnected the CD ROM and floppy and it booted fine.
- Took turns with the CD ROM drive and floppy drive connected/disconnected and saw it was the floppy drive causing issues.
- I tried the A4000 floppy in my A3000 and it worked fine.
- I tried the floppy from my A3000 in the A4000 and it behaved the same as the A4000 floppy.
- I tried a GoTek on the A4000 and it worked.
- If I install a jumper on J351, DF0: is recognized but I get an "Unreadable DF1:" icon on the workbench.
- If I set the jumper on the floppy itself to "DF1:" the floppy is recognized as DF1: regardless if I use the middle connector or end connector with or without jumper J351 installed.
- I can pair the floppy with the GoTek and set either one to DF0: and the other to DF1: and the system sees them how they're jumpered, i.e.: DF0: and DF1:, regardless which one is on the middle connector and which is on the end connector.
- Jumper J352 doesn't seem to affect what is going on.
- Jumper J351 does seem to matter. I get the best behavior when it is not installed and I have both the floppy and GoTek.
- The external floppy port seems to work fine, at least with the GoTek. It didn't seem to recognize a real floppy drive.
- I tried to go back to 3.1 and am getting similar behavior.
Now for the final weirdness.
- I can't boot from a floppy or the GoTek regardless which one is DF0: or DF1:
- I can't double click and hold the mouse buttons and boot into the boot selector screen (sorry, I can't remember the proper name). That is, I hold down both mouse buttons and the system just won't boot. The power light just flashes. This occurs regardless the floppy configuration.
- I can get it to boot and the system is stable by tinkering as described above. However, it won't boot from the floppy or GoTek nor can I do a double mouse click on power up to select boot options.
- When I have the configuration such that is is seeing the floppy and/or the GoTek, the system reads and writes to them without issue.
I would greatly appreciate any thoughts or ideas here. I strongly suspect I'm missing something simple.
Thanks for your time and ideas!
David