First post, by Iarsin
Hi, I read about the possibility to get those two kinds of controller working side by side in one ISA AT system (here MS-DOS).
I'm curious if I can achieve it. I got the options to retrieve Data by iomega zip parallel, buy a SCSI HDD for an ISA Adaptec controller, using PC or Ms Backup on floppy's, try to get the files over the network by mTCP and FTP or some software of freeDOS to get a shared folder, maybe Samba for DOS, if that exists or using a crossover cable and laplink or the like.
But I want to achieve to get them work side by side.
I'm not really familiar with retro computing, despite I'm trying for more than a year now.
Some tasks seems to me overly complicated, like the research for documentation and to get a solid imagination of the whole thing.
So I don't have any clues on MFM practically.
But I managed to get one out of five MFM drives working with one out of three MFM controller on my Unisys pw² 500 16 A. It's a NEC D5126 20Mb MFM ST506 5,25" HDD.
I unfortunately don't have the documentation of the Mainboard by hand, and could only find one by this forum for the pw² 300. But I think, DIPs and Jumpers are different.
I got seven multi I/O cards, but I can get only a few working with the CF Card which isn't connected to a XT IDE or XT CF either.
So I get maybe two cards which are able to be jumpered to use irq15 instead of 14, which the jumper and bios less wd1003V-MM1 with removed floppy controller (by Unisys) takes.
So ndiags shows undefined/unknown device at Irq14 when two controllers are attached at all he same time.
Means primary=controller at Irq14 ans secondary=controller at irq15?
1&2. HFDC-AT: Two times, each with different labels for sn, pn, name etc.
Hfdc fhc071872, V1G 09911, (EP)-1-VO
Clone of WD
https://computer-retro.de/Bilder/Multi-IO/WD- … 7C65CJM-ISA.jpg
HFDC-AT 2* (Research also Leo, WD)
IRQ15/Secondary not configureable
3. Kentech KT ide plus v2 004
(irq14 only) Acer Controller Chip
https://stason.org/TULARC/pc/hard-disk-floppy … -IDE-PL-75.html
Yet not tried
4. JPN CORPORATION (ide, cf card works) no irq15 for ide configurable)
CA8302E-I S/N790462 0118(H)
UMC chips UMC UM82C11, UM82C450, UM82450 SP.... (QC passed label cover chip name), C820 052A
CA8302E-I at stason th99
https://stason.org/TULARC/pc/hard-disk-floppy … ves-CA8301.html
JP9/jumpers 1 to 4 select Interrupt request for serial port 1 & 2. Pins 1 - 2 apply to serial port 1 (COM1/3) and pins 2 & 3 apply to serial port 2 (COM2/4). The factory defaults are JP9/jumper 2/pins 1-2 "closed" (COM1/3-IRQ4) & JP9/jumper 3 pins 2-3 "closed" (COM2/4-IRQ3).
Yet not tried
5. Longshine LCS-6624 G FCC id: JPDVA-MIO83757 (software controllable some thing like 757.exe, Also vivo, viva or the like
Chip: Winbond W83757F
Is working with 3drives driver as secondary controller (but ndiags and other claims that irq15 is free??)
6. E852 P/N-P2C94001 FCC ID: JGBPRIME 2C (LGS Prime 2C Chip)
https://www.vogonswiki.com/index.php/GoldStar_Prime_2C_MKIII
IDE seems to be broken.
7. Esio v1.1 (back) IO758P (front) (there is a gif with the layout and jumpersettings on the net) Winbond 83768F, Winbond 83787IF
Mine seems to be broken (disables onboard FDC of the Unisys Mainboard) Or I did the jumpering wrong. But I doubt that.
I got a NEC D5126 20Mb MFM/st506 5.25" HDD working on the Unisys altered WD 1003V-MM1 controller as only controller in the system (beside the floppy controller on board, which I don't know how to disable, and that was once destroyed, but now working again, what crippled my mind yesterday, because none of the formerly working IDE multiio wher3 working last night, because silently the floppy controller came back to life and conflicted silently with the multi I/O floppy controllers, which drove me crazy. At a last resort I tried to get the "destroyed " floppy controller working and voilà!)
I'm currently not aware, which controller might be faulty or defect. I guess lot's of issues derive from conflicts, eg with onboard serial or parallel controller and so on.