Got another one ...Machine 3
actually turns on, but won't recognize the Testdisk I am writing to get it going. The testdisk is needed to set the NVRAM values for memory size, harddisk and probably other stuff.
The key switch plays a crucial role in this operation: Set it to >0<, insert the disk but leave the drive open, switch the machine on, close the drive door and set the key switch to "Normal" to load the test disk. Here I get "Disk defect" no matter what physical disk and test disk image combination I use. The disks have a 720K, 80 tracks, 9spt layout, so on a PC they have to be written in a 1.2MB HD drive onto DD media.
If I don't bother with the key and testdisk procedure and just press ENTER with the key in NORMAL setting, I get this test page:
I'm still not sure what the cause of the failure to load the test disk is ... maybe the floppy controller, as I've already tried swapping in a different drive.
The working power supply allowed me to test the set of boards from Machine 2
, they work as well up to the configuration screen.Machine 3
has a different CPU and video board from the other dumped machine, No. 2. It's using a 286 at 10MHz, so the handwritten "Turbo" note on the case of Machine 1 makes sense, it probably also had the 286 boards.
The monitor cable has headers for both types of boards.
The harddisk was dead as a dodo, swapping in another one didn't work yet. PG 685 No. 3 - Backplane and CPU/Video card PG 685 No. 3 - Bezel and Keyboard PG 685 No. 3 - Drives and HDD controller PG 685 No. 3 - Memory and Module cards PG 685 ROM and CHAR BIOS, 286 ver.