fraveydank
Member
I acquired a CMD CQD-220TM (QBUS SCSI card) a while back that was working when I got it. Now, however, it's gone flaky; about 4 times out of 5, when I start my 11/23+ up, the thing doesn't respond properly to its CSRs. It's working in a sense, in that I can get the diagnostic utility to copy over to RAM when it does work properly, but it goes off after that at some point (when I bring up the "other utilities" section, it hangs when trying to read the serial number, and stepping through the code using ODT I can see it's stuck polling the CSRs and never leaving because it's always getting 0 back).
The infuriating part about this is that it was working, and it stopped behaving just when I finally had the time (and SCSI disks) to do something with it. The CPU appears to be an 8088 (or 8086, but there's only two '373s on the bus interface and an 8086 usually has 3; I don't really want to peel back the label on the CPU because I'll never get it back on). I'm worried that what's gone wrong is one of the million or so PLDs on the board (this thing is more than half PAL/GAL/PEEL); if that's the case, it'll never work unless someone happens to have bitfiles for the devices lying around somewhere. I could get an 8088 to replace this pretty easily, and if anyone has known good ROM dumps, I can at least verify the ROMs (and I have a UV EPROM eraser and a burner, but that would require peeling the labels back again).
Anyone have experience fixing/troubleshooting these? I'm a little bummed about this.
The infuriating part about this is that it was working, and it stopped behaving just when I finally had the time (and SCSI disks) to do something with it. The CPU appears to be an 8088 (or 8086, but there's only two '373s on the bus interface and an 8086 usually has 3; I don't really want to peel back the label on the CPU because I'll never get it back on). I'm worried that what's gone wrong is one of the million or so PLDs on the board (this thing is more than half PAL/GAL/PEEL); if that's the case, it'll never work unless someone happens to have bitfiles for the devices lying around somewhere. I could get an 8088 to replace this pretty easily, and if anyone has known good ROM dumps, I can at least verify the ROMs (and I have a UV EPROM eraser and a burner, but that would require peeling the labels back again).
Anyone have experience fixing/troubleshooting these? I'm a little bummed about this.