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  1. Thread: Ti-990

    by deramp5113
    Replies
    22
    Views
    734

    I worked on 990 system in 1981/82 in a multi-user...

    I worked on 990 system in 1981/82 in a multi-user environment. The the main thing I remember was the unique way user terminals were handled. Instead of bidirectional serial communication as with most...
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    Sounds like a fun little project! Mike

    Sounds like a fun little project!

    Mike
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    163

    https://deramp.com/downloads/altair/software/manua...

    https://deramp.com/downloads/altair/software/manuals/BASIC%20Manual%2077.pdf
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    Altair ROM BASIC executes from PROM instead of...

    Altair ROM BASIC executes from PROM instead of RAM like you're trying to do by moving Altair 8K BASIC. Altair's ROM BASIC is Extended BASIC and runs at C000h. See the two "Extended BASIC..." files...
  5. As always, there are trade-offs to consider for...

    As always, there are trade-offs to consider for RAM usage versus speed. Of course, this trade-off is a consideration for all sorts of software development, not just disk deblocking. Most of my work...
  6. Yes, for a device with native 128 byte sectors,...

    Yes, for a device with native 128 byte sectors, you can write a simpler BIOS without track buffering. However, for a BIOS that has to deblock any sector length other than 128 (very common -...
  7. The “Read Track” command reads every byte on the...

    The “Read Track” command reads every byte on the track, including all gap bytes, the address mark (track num, side, spec num, CRC), etc. Its more of a diagnostic/recovery tool.

    Mike
  8. You’ll never find an interleave factor that helps...

    You’ll never find an interleave factor that helps in all cases. One interleave may be optimal for the initial load of programs from the command line, but causes a significant penalty for some other...
  9. With the control it appears you have over...

    With the control it appears you have over formatting the disk, you can fix the boot speed issue and still leave the data portion of the disk (tracks 2-76) in the standard 8” SSSD format without...
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    About 15 years ago, Grant paid Optima to re-tool...

    About 15 years ago, Grant paid Optima to re-tool for the Altair case. Since he paid for the re-tool, Optima will only run the cases for Grant. My last contact with Grant was several years ago. I...
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    All pieces of the internal chassis are metal. ...

    All pieces of the internal chassis are metal.

    Mike
  12. In the original situation, your disk had a...

    In the original situation, your disk had a physical interleave of one. The software interleave performed by SECTRAN is used by the BDOS, but not by the CP/M cold loader. It appears your CP/M cold...
  13. Good looking job! A checksum won't catch every...

    Good looking job! A checksum won't catch every error, of course, but it wouldn't hurt to put it on there if there's room. If someone still can't get it to run they can always run a compare to the...
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    MITS/Pertec/iCOM FD3712, FD3812, FD360

    MITS/Pertec/iCOM FD3712, FD3812, FD360 owners: A few of us have been actively restoring this hardware and original software lately, and if you own any of this equipment, now would be a great time to...
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    21,546

    I’ll have to take it somewhere to have it...

    I’ll have to take it somewhere to have it scanned. They may be able to unbind the saddle staples and automatically scan it as a double sided 11x17 document and electronically reassemble the booklet....
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    21,546

    Looks like I have the RAM-80BE manual if you need...

    Looks like I have the RAM-80BE manual if you need me to get it scanned.

    Mike
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    21,546

    This is great! May I host them on deramp.com as...

    This is great! May I host them on deramp.com as well?

    Mike
  18. Just stumbled across this thread. Sounds like you...

    Just stumbled across this thread. Sounds like you have a good solution in place for you Sol-20. Running PT 5K BASIC like you've done is certainly the easiest solution when a Sol-20 is the target...
  19. NSDOS doesn’t need high RAM to boot whereas CP/M...

    NSDOS doesn’t need high RAM to boot whereas CP/M needs the RAM from 40K-48K (assuming the 48K CP/M you mention) to be good in order to operate properly. Do you have the 4K version of AMON with the...
  20. What’s your plan for programming the part? Or...

    What’s your plan for programming the part? Or more specifically, making it easy for an end user to write to the part? I considered making an adapter to give it a standard 27xx pinout, or a small...
  21. Great looking job! I literally started to make...

    Great looking job! I literally started to make something like this a few months ago to make SWTBUG like I want it for my 6800. I ended up going with an external EPROM instead and putting a switch on...
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    I planned on having lots of time starting in...

    I planned on having lots of time starting in October to get some serious development done, but unfortunately, real life has gotten in the way. I finally had a bit of time this last week and started...
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    From what I recall, the programmer address is the...

    From what I recall, the programmer address is the address of the socket you’re going to use to program. For example, if you enabled programming for the highest addressed socket, then set the...
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    In CP/M, ctrl-s should pause and resume the...

    In CP/M, ctrl-s should pause and resume the output. There’s also an option in the program for a 16x64 character screen. Type “SS 0” and I think it will display help in 16 line pages for you.

    Mike
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    So I assume the Matrox board must use PRDY...

    So I assume the Matrox board must use PRDY because it has to stall reads/writes around video refresh access? In this case, the problem you’ve run into is most likely that the Sol-20 drives PRDY high...
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