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Thread: MFM controller for S-100

  1. #11

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    Quote Originally Posted by MikeS View Post
    Sounds intriguing all right; what's the make & model of the CP/M box and the drive?
    It was in a Tandberg TDV 2324 (Norwegian brand) CPM machine. I rescued the MFM HDD; the controller and the 8" floppy drive.

    The HDD is a Rodime Series 200 , and the floppy drive is a Shugart.
    Current machines:
    PCs: IBM PC XT 640K, IBM PC XT 256K ,IBM PC XT , 2x IBM PC AT, Compaq Portable I, Compaq Portable II, Compaq Portable I/286, Philips Logic Analyzer XT clone, IBM PS/2 Model 30 286 , HP 95X, HP200LX (2x),Compaq SLT/286.
    Apple: Macintosh 512k, Macintosh SE, Macintosh Classic, PowerBook 170, iBook Clamshell, iBook G3,iMac G4 , TiBook's, Apple IIc, Many newer machines (G4, G5, Intel..), 20th Anniversary Mac
    Others: Commodore 64C,Amiga A500, CCS S-100 System, SNES,

    Wanted: Macintosh 128k, Hard Disk 20, System disks and games for the Mac

  2. #12
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    Quote Originally Posted by QuantumII View Post
    Here's that card I mentioned... Seems to be MFM-to-SASI (Shugart) controller

    Xebec controller
    Yup, just like the WD1000/1001--insanely easy to imterface to. The WD controllers used the Signetics 8x300-series bipolar controllers. You can probably still find the WD controllers within the TRS-80 community.

    My first IBM 5150 hard disk was a Shugart SA1004 and a WD1001, hooked to a homemade interface card in the PC.

  3. #13
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    Ah yes; I've got the SCSI version of the Xebec MFM bridge. Never figured out what to do with it though.

  4. #14
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    Quote Originally Posted by MikeS View Post
    Ah yes; I've got the SCSI version of the Xebec MFM bridge. Never figured out what to do with it though.
    I've got a couple of OMTI RLL-to-SCSI cards somewhere. They're identified as having the "Mac SCSI" ROMs. At one time, MFM/RLL drives were cheap in comparison to SCSI drives. I think this sort of bridge card was useful as a money-saver. I used mine (wtih some external "glue" logic) to interface an Atari ST to an MFM hard drive.

    Well, there's your "S100 MFM controller". SCSI isn't much more than a couple of parallel ports and software following a protocol definition, so it should be pretty straightforward to interface one of the SCSI-MFM bridge boards to an S100 parallel card.

  5. #15
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    Default HDD as virtual FDDs

    My IMS International system docs (1981) refer to an optional "hard disk sub-system" with removable cartridges in optional capacities of 32mB, 64mB and 96mB, in each case presented to CP/M as multiple "diskette drives" of 8mB capacity. No hardware or vendor standard is mentioned, but maybe that configuration suggests a Shugart-style controller (SASI)?

    Does anyone have information/memories on that style of HDD sub-system?

    The IMS system's FDC is Shugart-compatible card driving two Tandon 5.25 FDDs.

    The FDC card does not have any connectors or headers other than the two 34pin FDD connectors, so I guess the HDD subsystem was driven from its own s-100 card, not from a daughter-board like the interesting XEBEC shown by MikeS.

    So some kind of s-100 card must have been out there from around 1980 to as long as these machines were still running.

    My puzzle is still - how to connect a NEC D3142 to a S-100 system.

  6. #16
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    Your IMSI hard controller sounds like an SMD interface, not ST506 or SASI. Just a guess, however.

  7. #17

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    Yesterday I got the cover off my TeleVideo machine, and inside it had a similar adapter for connecting the HDD. Floppy connector (A flat one, you plug the floppy-end of the cable into it) in one end, and MFM hdd connectors in the other end.

    Maybe they're quite common after all..

    The TeleVideo is a multi-user Z-80 machine, but not S-100
    Current machines:
    PCs: IBM PC XT 640K, IBM PC XT 256K ,IBM PC XT , 2x IBM PC AT, Compaq Portable I, Compaq Portable II, Compaq Portable I/286, Philips Logic Analyzer XT clone, IBM PS/2 Model 30 286 , HP 95X, HP200LX (2x),Compaq SLT/286.
    Apple: Macintosh 512k, Macintosh SE, Macintosh Classic, PowerBook 170, iBook Clamshell, iBook G3,iMac G4 , TiBook's, Apple IIc, Many newer machines (G4, G5, Intel..), 20th Anniversary Mac
    Others: Commodore 64C,Amiga A500, CCS S-100 System, SNES,

    Wanted: Macintosh 128k, Hard Disk 20, System disks and games for the Mac

  8. #18

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    Hey, an update on the MFM S-100 controller.

    I have here the Cromemco STDC, which is a S-100 bus ST-506 controller

    This is exactly what you are looking for right ?

    The link to the manual is here

    It was in a pile of other misc cards I got from my haul.
    Current machines:
    PCs: IBM PC XT 640K, IBM PC XT 256K ,IBM PC XT , 2x IBM PC AT, Compaq Portable I, Compaq Portable II, Compaq Portable I/286, Philips Logic Analyzer XT clone, IBM PS/2 Model 30 286 , HP 95X, HP200LX (2x),Compaq SLT/286.
    Apple: Macintosh 512k, Macintosh SE, Macintosh Classic, PowerBook 170, iBook Clamshell, iBook G3,iMac G4 , TiBook's, Apple IIc, Many newer machines (G4, G5, Intel..), 20th Anniversary Mac
    Others: Commodore 64C,Amiga A500, CCS S-100 System, SNES,

    Wanted: Macintosh 128k, Hard Disk 20, System disks and games for the Mac

  9. #19
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    Looks like it. I note that the documentation mentions no other OS except Cromix. Do you have any driver software for it?

  10. #20
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    Default Cromemco STDC

    The control and data cable connectors match the NEC D3142, but its hard to see how this card could run between CP/M and the NEC HDD. Unless Cromemco had a CP/M implementation for it with a different manual.

    Even so, that Interrupt Priority Cable looks scary - is that a feature of Cromix-based systems or Cromemco generally? Not compatible with my system as far as I can see... Interrupts are all handled through the bus and system I/O card. This manual seems customized for a particular HDD with no other options.

    Would there be workarounds?

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