Any 8" machine experts around? I am trying to bring up a 6000 and have some sort of error when trying to install Xenix. Here's where I am so far:
The thing is, when I connect the hard drive that came with the machine, it actually boots off it - it did not boot until after I did the controller alignment. It gets all the way to the login prompt, but not knowing any passwords I did not log in. I want to set this drive aside until I know the rest of the machine is working properly (and after I read up on Xenix, I really have no idea how to use it yet)
I tried some of the other diagnostics on the diagnostic floppy, and the only ones I noticed so far that did not pass were within the Model II tests: the PIO test (which says I need a ?loopback? connector), and the interrupt test (image attached), but I do not know what tests are supposed to pass/fail on the 6000 vs the other machines. In particular, I read that the memory test on the type 4 HDC boards does not pass with the diagnostics on this disk, even though there's clearly a 2K SRAM on there.
So, anyone have any insight about what might be wrong? Am I missing something super obvious or is this main board in need of some serious troubleshooting?
- cleaned out dust (good lord was it ever dusty!)
- replaced filter caps and some leaky electrolytics
- cleaned floppy disk drive
- got one of the diagnostic disks from Ebay; it booted
- got impatient waiting for new foam and foil pads to get here; made own PS2 keyboard adapter
- also made an adapter to use a Gotek with FlashFloppy since I have no other 8" floppy hardware. Worked; was able to copy a TRSDOS disk onto a couple of real floppies and boot off it (the disks and the Gotek)
- thought I might have had a bad hard disk controller...
- Type 4, PP-2 board from what I can tell
- HDREL diagnostic gave only ID Not Found errors
- Decided to try Controller Alignment procedure on pg. 223 of Service Manual
- it fixed it! it now passes HDREL write/read test
- I think it was mostly the R2 adjustment
- side note: I could not get a DLYDATA pulse within the 70-80nsec specified, I could only get to 84ns. I noticed my controller chip has a WD1100-21 for U27 instead of the WD1100-11 on the schematic. I found a datasheet for that chip in this catalog, and it suggests a nominal RD pulse of 90ns. Not too familiar with Winchester drives, so I don't really know what this means.
- put 68000 board and ram board back in, tried the 68000 diagnostics, seemed to pass
- get ready to install Xenix - get the disk images, put on Gotek, and try to format the hard drive with diskutil
The thing is, when I connect the hard drive that came with the machine, it actually boots off it - it did not boot until after I did the controller alignment. It gets all the way to the login prompt, but not knowing any passwords I did not log in. I want to set this drive aside until I know the rest of the machine is working properly (and after I read up on Xenix, I really have no idea how to use it yet)
I tried some of the other diagnostics on the diagnostic floppy, and the only ones I noticed so far that did not pass were within the Model II tests: the PIO test (which says I need a ?loopback? connector), and the interrupt test (image attached), but I do not know what tests are supposed to pass/fail on the 6000 vs the other machines. In particular, I read that the memory test on the type 4 HDC boards does not pass with the diagnostics on this disk, even though there's clearly a 2K SRAM on there.
So, anyone have any insight about what might be wrong? Am I missing something super obvious or is this main board in need of some serious troubleshooting?