Image Map Image Map

Search:

Type: Posts; User: jim121049

Search: Search took 0.01 seconds.

  1. Replies
    41
    Views
    5,290

    Got it mostly figured out. P1 (R2,R3) points to...

    Got it mostly figured out. P1 (R2,R3) points to the dividend. P3 (R6,R7) points to the divisor. P4 (R8,R9) points to the quotient.

    I don't know what P2 (R4,R5) points to, but it's not the...
  2. Replies
    41
    Views
    5,290

    The multiply routine uses pointers to three...

    The multiply routine uses pointers to three registers. It was easy enough to load up the registers with test values, run the code in an emulator, look at the results and figure out what was input and...
  3. Replies
    41
    Views
    5,290

    Dwight, I've figured out how to use the multiply...

    Dwight,
    I've figured out how to use the multiply routine from the maneuver board code. A simple demo is available on GitHub if anyone's interested: https://github.com/jim11662418/4004-multiply-demo...
  4. Replies
    41
    Views
    5,290

    Dwight, I finally got around to massaging the...

    Dwight,
    I finally got around to massaging the "maneuver.f" file found on your GitHub page so that it assembles with the assembler I use (Alfred Arnold's Macro Assembler AS). The resulting binary...
  5. Replies
    41
    Views
    5,290

    Dwight, Thanks, I'll take a look at it.

    Dwight,
    Thanks, I'll take a look at it.
  6. Replies
    41
    Views
    5,290

    The resistor is on the "Clock Generator...

    The resistor is on the "Clock Generator Implementation" figure in the 4201A Data Sheet. Intel refers to it as a current limiting resistor. I didn't want to tempt fate by not using it.
  7. Replies
    41
    Views
    5,290

    Interesting. I'm using a IDT7134 4KX8 dual-port...

    Interesting. I'm using a IDT7134 4KX8 dual-port RAM to act as a 2732 EPROM for my 4004 SBC. https://sites.google.com/site/jamesloos/homebrew-intel-4004-single-board-computer/eprom-emulator
  8. Replies
    41
    Views
    5,290

    I was intrigued enough to look up the Practical...

    I was intrigued enough to look up the Practical Electronics Magazine PE Champ mentioned by mnbvcxz on page 2 of this thread. It's actually a ten part series (September 1977 through June 1978)...
  9. I've built a serial interface for an IBM...

    I've built a serial interface for an IBM Wheelwriter (see: https://sites.google.com/view/arduinowheelwriter/home). In a big place like Oakland or SF you should be able to find a Wheelwriter on...
  10. Replies
    13
    Views
    1,112

    Get a coiled MIDI cable like this one...

    Get a coiled MIDI cable like this one https://www.amazon.com/Cable-Up-PREMIUM-CABLE-Coiled/dp/B006OCTV8A cut off one of the ends and wire it up.
  11. Replies
    6
    Views
    493

    Question about Daisy Wheel Printers

    I have an IBM Wheelwriter that I'm trying to make emulate a Diablo 630 and thus have a question about daisy wheel printers that are capable of reverse printing:

    When reverse printing, does the...
  12. Replies
    41
    Views
    5,290

    Well, here's my contribution....

    Well, here's my contribution. https://sites.google.com/site/jamesloos/homebrew-intel-4004-single-board-computer
  13. Adding an External Disk Activity LED to an IBM PC with a Glitch Works XT-IDE Card

    Here's a quick, easy, cheap and easily reversible way to add an external disk activity LED to an IBM 5150 PC fitted with a Glitch Works XT-IDE card. Like many, if not most IBM 5150 PCs, my PC has...
  14. mTCP SNTP Client and Daylight Saving Time

    When I booted up my PC this morning (the last Sunday in October) it seems that the mTCP SNTP client thought that it was an hour earlier than it actually was. Apparently Open Watcom C uses the old...
  15. Here's what I did in this situation....

    Here's what I did in this situation. http://jcoppens.com/soft/howto/bootstrap/index.en.php
  16. Replies
    2
    Views
    627

    Puzzling Power Issue

    I have a 5150 PC and a 5170 AT, both with stock, original power supplies. Both were on this morning when I left the house for a walk.
    Both were off when I returned about an hour later even though...
  17. Replies
    26
    Views
    2,725

    I guess no one else sees the irony in a vintage...

    I guess no one else sees the irony in a vintage computer enthusiast calling a keyboard collector "weird". We need more of "Be as nasty and rude as you can to them..." in today's society.
Results 1 to 17 of 17