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Testsystem no. 1

# Hardware #

Computer PC-AT, ISA
Motherbord Appian OPUS/90 SX
BIOS Quadtel, Quadtel Corporation, 01/08/91
(with CTRL+ALT+S you get into the setup)
Controller Onboard HDD, FDD (each selectable with jumper on/off) The operation of an external MFM controller (ST-506/412) is thus easily possible.

The FDD controller (with the appropriate software; for example ImageDisk) is also able to write floppy disks in FM coding and one-sided!

The controller chip is a WD37C65CJM from Western Digital, here WDC '89. According to Dave Dunfield, the controller is compatible to 250 and 500 kpbs in single and double density mode (FM, MFM) but fails on double density with 128 byte sectors.

Prozessors Intel 80386 SX/16 und Intel 80387 SX/16
RAM 4x 1MB Simm, 30pin, 70ns, Hyundai (HY514400A / J-70 / 9608B Korea)
4x 1MB Simm, 30pin, 70ns, Siemens (HYB514400BJ-70 / Germany)
Network card 3Com EtherLink III 3C509B - C P/N: ASSY 03-0021-003 Rev A
Paketdriver: 3c5x9pd.com

# Software #

Operating system MS-DOS
Version 6.22 (de)

Testsystem no. 2

# Hardware #

Computer PC-AT, ISA
Motherbord Appian OPUS/90 SX
BIOS s.o.
FDD 0: uninstalled / FDD 1: uninstalled
HDD 0: Type 2 / HDD 1: Type 2
Controller Onboard HDD, FDD (switched off by jumper)

HFA-110W Multicontroller mit WD42C22-A Chip
(similar Western Digital WD1006V-MM2 or WD1003V-MM2)
The floppy disk drive is automatically detected by the controller.
Harddisks HDD 0: Seagate ST-225 MFM / 20 MByte / ST-506/412
HDD 1: Seagate ST-225 MFM / 20 MByte / ST-506/412
Prozessors s.o.
RAM s.o.
Network card s.o.

# Software #

Operating system MS-DOS
Version 3.20 (en), (Commodore PC I / 31.08.1987)
Testsystem Nr. 2
Testsystem no. 2 with two MFM HDDs

The experienced retro hobbyist will now, of course, say that signal cables, and in particular the data cable, are far too long for the MFM hard drives. Yes, that is correct, but I have not had any malfunctions so far. Even with too long cables, the overall system works well. No data bits have been struck during the transfer yet!

The MFM signal cable, like the floppy cable, has a twist, but ... The floppy cable has a twist on lines 10-16, the MFM cable has a twist on 25-29. Otherwise both have 34 lines.

(tbr, 17.04.2018 / last changes: 25.05.2018)