I have a 1982/84 NCR Decision Mate V (Five) in working order. That is, it boots from a floppy/gotek.
The base version uses a Z80 for CP/M-80 2.2. Among a variety of options were:
- an internal or external 8088 with which CP/M-86 and MS-DOS 2.11 were available
- an internal or external 10Mb ST-506/MFM hard drive.
My DMV has the 10Mb internal hard drive (an ST-412), which uses a 1982 WD1001-05 controller. The hard drive returns 'Not Ready' when accessed. Given that the two drives tested to date were functional when read with a David Gesswein 'MFM Emulator', I suspect there may be a fault with the WD1001-05 controller.
One reason for this suspicion is that there is a very incomplete install of MS-DOS on the ST412 drive. It's possible the controller may have failed at an early point in the install.
Here's a photo of the WD1001-05 board:
The WD1001 is well-documented. The hardware manual with schematics is on Bitsavers.org.
There are two initial steps that would be useful before deeper investigation:
- 'borrow' a WD1001 from another vintage system (early 1980s)
- replace the 50-pin socketed microcontroller on the board, a Signetics 8x305.
Can anyone help with information?
1. Which other systems used the WD1001-05 (or the WD1002-05 or WD1002-HD0)?
2. Which other systems used the 8x305 microcontroller?
Among the documentation of the DMV on oldcomputers.dyndns.org is a photo of the DMV's external (plug-in) hard drive interface. This shows a WD1002-HD0 controller board with a manufacture date of 1984. It seems possible that the WD1002 may have been fitted internally to DMV systems manufactured at a later date than mine.
Can anyone confirm whether the WD1002 is able to act as replacement for the WD1001?
With thanks in anticipation.
The base version uses a Z80 for CP/M-80 2.2. Among a variety of options were:
- an internal or external 8088 with which CP/M-86 and MS-DOS 2.11 were available
- an internal or external 10Mb ST-506/MFM hard drive.
My DMV has the 10Mb internal hard drive (an ST-412), which uses a 1982 WD1001-05 controller. The hard drive returns 'Not Ready' when accessed. Given that the two drives tested to date were functional when read with a David Gesswein 'MFM Emulator', I suspect there may be a fault with the WD1001-05 controller.
One reason for this suspicion is that there is a very incomplete install of MS-DOS on the ST412 drive. It's possible the controller may have failed at an early point in the install.
Here's a photo of the WD1001-05 board:
The WD1001 is well-documented. The hardware manual with schematics is on Bitsavers.org.
There are two initial steps that would be useful before deeper investigation:
- 'borrow' a WD1001 from another vintage system (early 1980s)
- replace the 50-pin socketed microcontroller on the board, a Signetics 8x305.
Can anyone help with information?
1. Which other systems used the WD1001-05 (or the WD1002-05 or WD1002-HD0)?
2. Which other systems used the 8x305 microcontroller?
Among the documentation of the DMV on oldcomputers.dyndns.org is a photo of the DMV's external (plug-in) hard drive interface. This shows a WD1002-HD0 controller board with a manufacture date of 1984. It seems possible that the WD1002 may have been fitted internally to DMV systems manufactured at a later date than mine.
Can anyone confirm whether the WD1002 is able to act as replacement for the WD1001?
With thanks in anticipation.