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  • Fooser's Avatar
    November 11th, 2020, 10:27 AM
    Fooser replied to a thread Model I Issues in Tandy/Radio Shack
    So I went a bit off the reservation. Changing too many things makes it tough to troubleshoot but there you are. Hoping to make advancement of some...
    23 replies | 1951 view(s)
  • Fooser's Avatar
    October 30th, 2020, 09:01 AM
    Fooser replied to a thread Model I Issues in Tandy/Radio Shack
    I checked out Z27 and found what I think are anomalies if I read the schematic correctly. Pin 4 was pulsing rather than high. Pin 2 was pulsing...
    23 replies | 1951 view(s)
  • Fooser's Avatar
    October 29th, 2020, 06:38 AM
    Fooser replied to a thread Model I Issues in Tandy/Radio Shack
    Both are pulsing high.
    23 replies | 1951 view(s)
  • Fooser's Avatar
    October 28th, 2020, 09:12 AM
    Fooser replied to a thread Model I Issues in Tandy/Radio Shack
    I found my other probe and pin 3 of Z30 is definitely low. Pin 2 caused the probe to blink both hi and low at a high rate of speed.
    23 replies | 1951 view(s)
  • Fooser's Avatar
    October 28th, 2020, 08:42 AM
    Fooser replied to a thread Model I Issues in Tandy/Radio Shack
    BTW I get the same condition from the probe when I touch it with my fingers. And I get 0 volts on either pins.
    23 replies | 1951 view(s)
  • Fooser's Avatar
    October 28th, 2020, 08:20 AM
    Fooser replied to a thread Model I Issues in Tandy/Radio Shack
    Larry... I'm not sure my logic probe is working correctly. Both pins 2 and 3 of Z30 caused the probe to blink both hi and low at a high rate of...
    23 replies | 1951 view(s)
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About Fooser

Basic Information

About Fooser
Biography:
Don Mankin
Location:
Medford, OR, US
Interests:
TRS-80s, Sprigets, RC Airplanes, Foosball
Occupation:
Programmer, PC & Android

Signature


- Don Mankin -

[
TRS-80 Models I, 4, 4p, Coco 2, 100, 102. Tandy 1000 RLX. Osborne 1a.
At
ari 800, 520 STm. Commodore 64.
Amiga 1000. TI-99/A. Sinclair ZX-81]

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November 11th, 2020 10:28 AM
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January 5th, 2012
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