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Type: Posts; User: jhalbrecht

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    Keys installed

    I received the keys and installed. Hooked it up with the expansion interface and the video monitor. Works!

    53615

    Placed an ad for it on CraigsList and updated and enhanced my wiki page a bit.
  2. Well I totally blew the auction and a couple...

    Well I totally blew the auction and a couple others that day. I don't know what key I hit but it sure wasn't submit bid. Anyway with no bids, I contacted the seller and offered to buy it to which he...
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    Parts ordered

    I ordered up the three keys from Ian Mavric. Thanks for the link. $5/each plus $4 from Australia and $0.99 from PayPal I guess for currency conversion and funding.

    Ian says; "You can't use M4 key...
  4. Doh! Posting a vintage computer for sale on VCF...

    Doh! Posting a vintage computer for sale on VCF East weekend!
    also
    Doh! Forgot to mention the included original documentation in the three ring binder!

    53174
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    WTB / Need TRS-80 Model 1 Keycaps

    I've got this Radio Shack TRS-80 Model 1 working after replacing a chip in the Video RAM.

    I'm missing three key caps. 'X, ':' and 'BREAK'. Anyone have some spares? Is there a TRS-80 Bone yard?
    ...
  6. Processor Technology Sol-20 Restored and working

    52948

    I'm selling a Processor Technology Sol-20. I posted it on Craigslist in Phoenix Arizona check it out for current images. I'm willing to ship to addressees in the United States.

    I'll...
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    Selling this restored Sol-20

    52947

    I'm attempting to sell this Sol-20. I placed an add on Craigslist in Phoenix, Arizona. Hoping to sell it without ePay.
    ...
  8. How much is it worth? Not to be flip but I guess...

    How much is it worth? Not to be flip but I guess whatever the buyer is willing to pay. I think the price on the one at ePay is a bit steep. But I don't see them often either... I think I only...
  9. I was hoping to find a nicer specimen before the...

    I was hoping to find a nicer specimen before the auction ends! :-) But I would like to have it.
  10. WTB; Vector Graphics Vector 1 S-100 chassis

    Back in the day the Vector Graphics Vector 1 S-100 computer was a favorite. Somehow I let it getaway. Now I'm wanting to find one again. I'll give it a good home.

    52708

    There is one like this...
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    Imsai 8080 MPU-A ROM Monitor success

    I'm hoping that this thread will eventually lead to a boot from floppy from the CalComp eight inch disk. Meanwhile Some relevant information has come up in a couple other threads. There are a few...
  12. It's pretty clearly marked on my board too! ;-)

    It's pretty clearly marked on my board too! ;-)
  13. Doh! - Success!

    Best suggestion would be to stop making assumptions!

    I assumed X0 - X31 = 32 chips. It's X1 - X32 And those last two chips were right to left not left to right.

    Anyway in the light of day after...
  14. Tanner 64k Static RAM with AM2716DC EPROM

    For use in my Imsai FIF project.... I'm attempting to run Martin's MEMON80 monitor from an AM2716DC EPROM placed at the top of a 64k COEX (Tanner/ Digital Research) Static RAM board. I burnt the...
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    Imagedisk Proof of Concept Success!

    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 Shugart 801 in Problem Solver Systems single drive...
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    I hooked up my ASR33 with Martin's 88-2SIOJP...

    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



    88-2SIOJP
    20ma current loop to RS-232 conversion
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    ImageDisk progress; Silly BIOS single floppy

    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 attempting to find and write an 8" boot disk for...
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    Doh! Completely misread that dip switch! I just...

    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 floppy.

    I'll tackle ImageDisk on the 8" drive...
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    Imagedisk ISA 16 bit AHA-1542cf for boot

    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 a 486 I disabled the FDC with a jumper on the...
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    Found clean copy of VB1B .PDF

    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 all the various sites including mine and John's...
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    Channel B equates

    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 the one you're not testing.


    ; jsio.asm jha...
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    A3 works both ways

    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 need handshaking for a printer or modem...
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    SIO Success

    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 trick was the software initialization. Now where is...
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    Helpful VCF thread

    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
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    SIO Configuration

    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. All the cards had necessary internal and external...
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