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  • jhalbrecht's Avatar
    Yesterday, 12:48 PM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    I didn't find a CCS .IMD image but I did find a CompuPro Z80 .IMD boot disk. I successfully wrote it and booted. Imagedisk system is an eight inch...
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    Yesterday, 06:27 AM
    I hooked up my ASR33 with Martin's 88-2SIOJP Perhaps you can correlate his documentation with the Altair doc. Check out these two pages ...
    12 replies | 177 view(s)
  • jhalbrecht's Avatar
    August 18th, 2018, 03:05 PM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    Well this is kinda silly... This BIOS is only supporting one Diskette.... Not like it's going to have an entry for 8" floppy though... ;-) Before...
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    August 17th, 2018, 06:28 PM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    Doh! Completely misread that dip switch! I just booted off of floppy on the AHA-1542! And can read the IDE drive under FreeDOS booted from the 1.44...
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    August 17th, 2018, 04:34 PM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    I've been messing around for a couple days now just trying to swap in an Adaptec AHA-1542cf into one of two machines I have with ISA 16 bit slots. On...
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    August 11th, 2018, 09:59 AM
    jhalbrecht replied to a thread Ssm vb1b sn 1133 in S-100
    FWIW I started working on the other VB1B S/N; BB I couldn't read the schematic as the scan was so faded. I went on a hunt for a different copy. Seems...
    8 replies | 243 view(s)
  • jhalbrecht's Avatar
    August 4th, 2018, 03:59 PM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    I found the equate for the second channel, channel B (on the right hand side) just add 2. I put both channel equates in the test code. Comment out...
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    August 4th, 2018, 02:30 PM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    I tried it with the A3 jumper in both configurations, it works both way. They change DTR and DSR and may be more important if I try some XMODEM... or...
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    August 4th, 2018, 01:44 PM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    It works! Success. This code works for me. It echos the keyboard to the screen. I configured the A3 jumpers as in the Imsai documentation. The...
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    August 4th, 2018, 11:46 AM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    This VCF Forum thread is helpful particularly if you log in so the images display. How to get output from SIO with Intel 8251A USART
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    August 4th, 2018, 09:51 AM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    To recap. I'm attempting to restore this Imsai with Calcomp drives to functionality. The Imsai 8080 and Imsai FDDs look to have been a working set....
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    July 30th, 2018, 03:27 PM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    The relay is on the entire primary to the power supply. Check this out on the IFM board I found a place where those relay wires must have gone.
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    July 30th, 2018, 03:21 PM
    jhalbrecht replied to a thread Imsai FIF FDC project in S-100
    Blam goes the Tantalum C21 on the IFM Rev 6 board. I don't have any schematics for the IFM or the FIB boards. Has anyone seen schematics for these...
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    July 29th, 2018, 05:09 PM
    jhalbrecht started a thread Imsai FIF FDC project in S-100
    I recently acquired another set of Imsai Calcomp drives and a two board set of an FIF FDC consisting of the FIB and IFM cards as well as all...
    15 replies | 489 view(s)
  • jhalbrecht's Avatar
    July 29th, 2018, 12:12 PM
    jhalbrecht replied to a thread Ssm vb1b sn 1133 in S-100
    Thanks. I remember you saying something about having to read memory for it to display but I didn't understand what you meant at the time. I guess...
    8 replies | 243 view(s)
  • jhalbrecht's Avatar
    July 29th, 2018, 11:54 AM
    jhalbrecht replied to a thread Ssm vb1b sn 1133 in S-100
    Implemented CODE tags in the original post restoring the spaces in the DB statements. Last night while posting I looked all over for 'code'...
    8 replies | 243 view(s)
  • jhalbrecht's Avatar
    July 29th, 2018, 10:15 AM
    jhalbrecht replied to a thread Ssm vb1b sn 1133 in S-100
    FWIW The video monitor in the first message of this thread was a five inch monitor. Here is another image with a thirteen inch monitor and the...
    8 replies | 243 view(s)
  • jhalbrecht's Avatar
    July 28th, 2018, 06:42 PM
    jhalbrecht replied to a thread Ssm vb1b sn 1133 in S-100
    Never mind this whiny reply. I found the Code tags with a nudge from Chuck (G) Code tags are on the advanced menu. FYI I cleaned up the first post in...
    8 replies | 243 view(s)
  • jhalbrecht's Avatar
    July 28th, 2018, 06:16 PM
    jhalbrecht started a thread Ssm vb1b sn 1133 in S-100
    Background I have a couple SSM VB1B video cards. I'll refer to them by their serial # The one I have working is 1133, the other I'll call SN BB...
    8 replies | 243 view(s)
  • jhalbrecht's Avatar
    July 25th, 2018, 01:43 PM
    Yup, you did. (Actually I found two) I quickly boxed it up with a ZPU, TUART and a 64KZ and sent them off to Martin who connected it to the Cromemco...
    8 replies | 304 view(s)
  • jhalbrecht's Avatar
    July 25th, 2018, 11:36 AM
    Thanks for the heads up on the Cromemco Google Group. From Glitch's article on creating boot media for the 4FDC; "Dave Dunfield has also provided...
    8 replies | 304 view(s)
  • jhalbrecht's Avatar
    July 24th, 2018, 11:29 AM
    A bit of progress, the Siemens drive is responding to RDOS monitor commands. Check out this image off the Wyse terminal displaying the RDOS monitor...
    8 replies | 304 view(s)
  • jhalbrecht's Avatar
    July 24th, 2018, 09:09 AM
    I got a signon out of RDOS with my Cromemco Z-2D. Check it out here for some pictures. ZPU, (2) 16KZ RAM cards and a 4FDC. I have some possibly...
    8 replies | 304 view(s)
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