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Type: Posts; User: Chuck(G)

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  1. Replies
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    Under BASIC, try the following: OUT...

    Under BASIC, try the following:



    OUT &H3F2,&H1D


    The LED on drive A: should go on and the motor should start spinning.
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    The floppy controller relies on two devices for...

    The floppy controller relies on two devices for successful operation--the 8259 interrupt controller (IRQ 6) and the 8237 DMA (DMA channel 2) controller. It could well be possible that there's a...
  3. Does your system's BIOS setup have a choice for...

    Does your system's BIOS setup have a choice for 5.25" drives? If so, then you should be set.
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    Yabut it's as much a test of the controller as it...

    Yabut it's as much a test of the controller as it is of the drive. If you want an objective test of the drive, then it's a special hardware rig.
  5. Strange, my Win7 system doesn't have any problem...

    Strange, my Win7 system doesn't have any problem with 5.25" drives.
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    If you're serious, there were hard drive...

    If you're serious, there were hard drive "exercisers" or "testers" that did away with the controller entirely. Since an ST506 drive has no smarts on the data lines, it's a pretty simple matter of...
  7. The DC37 connects to a floppy controller--usually...

    The DC37 connects to a floppy controller--usually something like a Sysgen Omnibridge. Has nothing to do with a parallel port.

    Sysgen also offered a mux-type add-in card that used the host...
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    Looks to be an ADDS Viewpoint (90?l) serial...

    Looks to be an ADDS Viewpoint (90?l) serial terminal with a custom keyboard. But that's just a guess. There were many versions of the Viewpoint, including some with landscape screens.
  9. You may want to send a PM to Ronklein, since his...

    You may want to send a PM to Ronklein, since his last visit was in April--and the original post was made 2 years ago.
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    While RLL results in a higher recovered data...

    While RLL results in a higher recovered data rate, the spectrum on disk has the same high-frequency limit that ordinary MFM (and for that matter, FM) does. If you've got a good spectrum analyzer,...
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    It's standard fare in this area for getting slash...

    It's standard fare in this area for getting slash piles burning--that and a couple gallons of diesel.
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    Some idea of what the original keylock and power...

    Some idea of what the original keylock and power switch looks like might help. Unless they're really peculiar, it should be pretty simple to source new ones.

    At one time, pins with a forked end...
  13. Not meaning to go too far astray, but the 720K...

    Not meaning to go too far astray, but the 720K 3.5" drive was a standard option in 1986 for IBM. See the applicable O&A description.
  14. ...and I'm completely in the dark for DOS...

    ...and I'm completely in the dark for DOS versions intended for the PC98 market. This would seem to be a natural for 2.25.
  15. Depends on what you define as "DOS/MS-DOS". We...

    Depends on what you define as "DOS/MS-DOS". We were using 800K 5.25" drives on MSDOS 1.x and 2.x--and I have the disks to prove it. Of course, we used our own IO.SYS for an "not quite PC...
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    So what were you planning to use this with? ...

    So what were you planning to use this with? Does your SWTPC 6800 have a serial interface?

    The GI AY-3-1013 is a UART only; it has no synchronous capabilities. To add a synchronous serial...
  17. Likely the difference between single- and...

    Likely the difference between single- and double-sided drives.
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    Well that makes no sense, unless the clock signal...

    Well that makes no sense, unless the clock signal is being generated externally. Where does pin 10 of the 1489 go?
  19. PC JX was released in 1984 with 3.5" drives: ...

    PC JX was released in 1984 with 3.5" drives:

    https://upload.wikimedia.org/wikipedia/commons/thumb/0/01/IBM_JX.jpg/500px-IBM_JX.jpg

    Granted, they were 720K, but there you have it. Note also,...
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    I think so. Let's look at what you should be...

    I think so. Let's look at what you should be seeing on UART.

    Pin 40 should have a clock signal on it that's 16 times the "baud" rate. So, if the board was set up to do 1200 bps, the frequency...
  21. I've got a couple of the 8x300s in my hellbox. ...

    I've got a couple of the 8x300s in my hellbox. At one time, they were the controller of choice for SA-1000/4000 type drives.
  22. Hmmm. Could have been an OEM version that never...

    Hmmm. Could have been an OEM version that never saw the light of day.

    Page 2 mentions PC-DOS 2.25 being sold by Atari
  23. Oh, I thought that people actually used the...

    Oh, I thought that people actually used the things. I don't know why a new design would use one of these anyway. Power-hungry doesn't even begin to describe the things. But, you know--RISC!
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    Nice suggestion, but this is going to be a bit...

    Nice suggestion, but this is going to be a bit challenging for standard shapes. I've got a shop full of tools, so it should be pretty easy. I could machine card guides from nickel-silver if the...
  25. Most designs with the 8x30x didn't use the 8x360...

    Most designs with the 8x30x didn't use the 8x360 MAD. If this is a new design, you can probably get similar functionality with a single CPLD. All of those specialized 8x3xx peripheral chips were...
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