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  • Mike_Z's Avatar
    Yesterday, 06:49 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    Well..... I just could not keep away or stop thinking about this problem. While watching football on TV, I thought that maybe the problem really is...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    January 18th, 2020, 06:23 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    I used the same chips. Although I have replaced the 8272, FDC, 8237, DMA, and 8259 PIC, with no effect. The other logic chips got mixed up, meaning...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    January 17th, 2020, 03:18 PM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    I have one socket that is a little suspect. I have the front panel board plugged into that one. Yet the contacts all brightened up nicely after...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    January 17th, 2020, 07:05 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    I believe I looked at that a while back, but will check it again.Thanks, Dwight for the tip. Right now I a little concerned about the S-100 bus...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    January 16th, 2020, 10:34 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    No, the FDC is the only interrupt I have. And since I'm so much luck using them, I don't think I'll be converting any of my polled deviced anytime...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    January 15th, 2020, 01:17 PM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    No.... The DMA DACK0 8237 Pin 25, goes directly to the 8272 Pin 15. AND the DMA EOP 8237 Pin 36 is inverted and applied to the 8272 Pin 16. Why...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    January 15th, 2020, 11:58 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    I did not forget about this. I got sick and could not participate. It hit me hard. I could not go into the basement and work. In fact any kind of...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    January 2nd, 2020, 01:55 PM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    I think I remember seeing a wiring pencil, but never used it. As far as me using an open blade that is as sharp as a surgical unit, I fear that blood...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    December 31st, 2019, 07:45 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    You know, I really enjoy conversing with you guys. Dwight brings up an interesting question. My 8080 machine is home made and centers around an IMSAI...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    December 28th, 2019, 11:40 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    Chuck, I'm using a Vector Board. This board has the power laid out, making the power connections to the IC's and bypass capacitors rather easy. I...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    December 28th, 2019, 11:02 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    I looked at the Micro Stripper. Maybe at some future date, if I need a new stripper I'll consider it. So far my method of insulation release seems to...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    December 27th, 2019, 07:36 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    Over the Christmas break, while waiting for my new parts, I decided to update my FDC KiCAD print. I found that I also needed to update my version of...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    December 23rd, 2019, 04:11 PM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    Today, I spent some time removing all the old sockets and wiring from my FDC board. It is amazing how fast things come apart and how slow they go...
    134 replies | 5898 view(s)
  • Mike_Z's Avatar
    December 22nd, 2019, 08:45 AM
    Mike_Z replied to a thread Frustrating Problem in CP/M and MP/M
    Those pictures look pretty good. Except there is a slot in the top that your picture is missing. Yes the top diameter is 0.012". I can take a couple...
    134 replies | 5898 view(s)
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About Mike_Z

Basic Information

About Mike_Z
Biography:
Retired Old Steam Power Plant Engineer
Location:
Near Milwaukee Wisconsin
Interests:
Old stuff, computers, cars, furniture, houses
Occupation:
Retired

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Yesterday 06:49 AM
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December 1st, 2013
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