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Type: Posts; User: cfsimmons

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    3174 Microcode imaging

    I made an interesting discovery today. After taking another look at the pinout for the 2.4 meg drive, I decided to see what happened when I pulled pin 2 low while the disk was spinning. The drive...
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    XT/370 Technical Reference

    Does anyone have a copy of the XT/370 Technical Reference (6936732)? I've only seen it mentioned.
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    Looks like I had it set right, and to be sure I...

    Looks like I had it set right, and to be sure I checked with a multimeter.

    I think I'll just let it be for now.
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    I believe I set the switches correctly, either...

    I believe I set the switches correctly, either way it shouldn't have stopped the machine from POSTing. And trying the card in the 5170 gives the same results.
    The only other card I had in the AT was...
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    Darn, well thanks for looking. If anyone else...

    Darn, well thanks for looking.
    If anyone else could provide an image of the rom, or suggestions of other other things to check for it'd be appreciated.
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    I just checked, and the rom is in fact an EPROM...

    I just checked, and the rom is in fact an EPROM (NMC27C256Q200). Do you think it's likely to be corrupt? If so, I have a programmer that can program it, but not an eraser.
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    Everex EGA Card Troubleshooting

    I picked up an Everex EV659 recently, and I'd like to use it in my 5170. However when I install the card the system fails to POST, no beeps. The same goes for when I try it in my 5160.
    Additionally,...
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    Thanks for the added insight. I hadn't noticed...

    Thanks for the added insight. I hadn't noticed that portion of the 82C570 data sheet before. I guess it didn't occur to me that a description of the built in features in microcode would tell me...
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    Oh sorry, I mixed up my numbers. 2 is an input...

    Oh sorry, I mixed up my numbers.
    2 is an input to the drive. 4 is an output and behaves like I described earlier, probably INUSE.
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    All of the even pins on the hitachi drive I have...

    All of the even pins on the hitachi drive I have are clearly grounded, a quick visual inspection reveals as much.
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    I first tried using my Pentium II machine which...

    I first tried using my Pentium II machine which has a controller capable of 1Mbps and the HxC software, but that could only read the first cylinder.
    After that I used a rpi and this project since...
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    If it was MFM wouldn't you still expect to see...

    If it was MFM wouldn't you still expect to see certain conventions like 0x4e gap bytes (the screenshot I got at least did not appear to be 4e).
    Also what would a different RLL code look like on the...
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    Non-crummy images:...

    Non-crummy images:
    http://cfsimmons.com/files/ibm/3174/deltas.png
    http://cfsimmons.com/files/ibm/3174/gap.png
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    The drive grounds all the pins on the odd number...

    The drive grounds all the pins on the odd number side. The only pin that seems out of place is 3, which is a signal coming from the drive and seems to go low whenever the drive is selected and...
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    Unfortunately, I haven't had the time to look...

    Unfortunately, I haven't had the time to look into these disks lately. I expect to be able to work on this starting this weekend.
    On top of that I don't really have a way to probe signals while the...
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    I haven’t considered the possibility that the...

    I haven’t considered the possibility that the drive has additional signals, that’s worth a look though.
    I think my next step is going to write my own c code for the raspberry pi which records only a...
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    I was thinking about a similar project recently....

    I was thinking about a similar project recently. I figured the DP8340/41 chips do almost all of the hard work involved with the serial communication. The CUT protocol itself though seems to very...
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    Is that a DSL disk? I seem to remember reading...

    Is that a DSL disk? I seem to remember reading those disks could be created on a pc.
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    I used the 2.4 mb drive yes with a raspberry pi...

    I used the 2.4 mb drive yes with a raspberry pi with bbc-fdc. I've also noticed the CRC consistently doesn't match for the data blocks.
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    I've also been looking into imaging these disks....

    I've also been looking into imaging these disks. From what I can tell the first cylinder is encoded like a normal IBM disk. That is with 15 sectors per track, A1 sync marks, FE address blocks, and FB...
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    I just attempted imaging a 3174 floppy recently...

    I just attempted imaging a 3174 floppy recently as well. I used a raspberry pi and the bbc-fdc project (https://github.com/picosonic/bbc-fdc).
    It uses the SPI input on the pi to record an entire...
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    I'm using the Diagnostics/370 Personality disk....

    I'm using the Diagnostics/370 Personality disk. It only asks to confirm a list of xt/370 hardware, implying the diagnostics only test the xt/370 specific cards.
    As for the BIOS I have U18=1501512,...
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    XT/370, need help

    I recently bought an xt/370 card off ebay and am having trouble getting it to work in my xt. To be specific the only xt machine I have at the moment is a 3270 PC.
    Trying to run vmpc, gives an error...
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    I should have been more clear. I'm not interested...

    I should have been more clear. I'm not interested in getting a 3174 but I very well might if its the only solution. Emulating the mfm drive is just a way of getting that setup working.

    From what I...
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    Ultimately, I'd like to be able to talk to these...

    Ultimately, I'd like to be able to talk to these terminals. Connecting one to Hercules is an end goal. The only terminal I have at the moment is a 3270 PC, but I'd love to get a 3279. I won't bother...
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