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Recent content by Jan1980

  1. J

    Imsai 8080 second graphic crt...

    Hello. Normally, my imsai is working fine. My setup is: - original Intel 8080 cpu card - 2x salota mixed memory ( 60k of RAM + Floppybios at F000h + homemade monitor programm at F800h ) - Interfacer 1 serial card - versafloppy 1 floppycontroller - 8" dual floppy station (no imsai) - Esprit...
  2. J

    CP/M terminal for BBS

    Hello. I am using Imsai 8080 with 2x 8"sssd floppy station and Esprit terminal. It´s connected to main PC with nullmodem cable. I transfer files via xmodem protocoll from pc to imsai, this works fine. Now, i want to use my Imsai to take a look to BBS boxes. How can i do ? I does not find a...
  3. J

    Cordata PPC cga graphic..

    Hello. I have got a Cordata PPC. I cleaned it and i repaired floppy controller on board. Now, it works. But i don´t understand the graphic mode, checkit says it is cga. For example, boulder dash works fine on my IBM XT in CGA mode. On cordata, i can begin to play, but scrolling does not work...
  4. J

    Cordata PPC keyboard...

    Hello. I have got a Cordata PPC last week. I am looking for a keyboard with german layout ! US layout also ok ! Please help ! thx Greetings from germany Jan
  5. J

    Looking for Corona PPC

    Hello. I am looking for a Corona PPC 400 in good working condition. Anybody want to sell Corona ppc ?? thx Jan
  6. J

    Kaypro II floppy mod ?

    Hello. Before a few weeks, i bought Kaypro II (not 2), the first version. Normally, it has 2 Tandon single sided double density floppy drives. But this one had 2 Shugarts SA465 double sided quad density drives. Of course, it works not in QD mode. But there is a mod. They soldered cable from...
  7. J

    Looking for 5.25“ alignment disk.,

    Hello. I am looking for an 5.25“ analog alignment disk Dysan 224/2a or equivalent to adjust my tandon tm100-2a floppy drives properly. Perhaps, anybody can sell me alignment disk ?! Thx Jan
  8. J

    Shugart SA450...

    Hello. I have got a shugart SA450. Can anybody help with a repair manual with wiring diagram ? The floppy drive is in a nice condition, but not working. I adjusted the revolutions on drive motor to 300 rpm with oscilloscope. I can format a diskette with my imsai but i cannot read or write...
  9. J

    Versafloppy 1 Seek Error..

    Hello. Before a few weeks, i´ve got my Imsai. I rebuilt it, it works and looks really nice. I have got a monitor dump to transfer intel hex files from my main PC to the Imsai. Then, i wrote Versafloppy Floppy bios matched to my hardware and programmed an eprom. Everything worked. I programmed a...
  10. J

    Imsai 8080 CP/M install problems..

    Hello. I´ve got an Imsai 8080 and i rebuilt it last month. It has original 8080 processor card, versafloppy 1 floppy controller, interfacer 1 serial card and 2 salota mixed memory card. It has 64kb memory, but on F000 is floppy firmware and on F800 is a small monitor programm to load intel hex...
  11. J

    RX and TX ready mask ??

    Hello. Now, my Imsai 8080 is running on the terminal. I wrote a few small routines to send some stuff to terminal and reverse. I want to burn a machine language monitor to eprom and i have to change some parameters. I use interfacer 1 serial card. My dataport is 00, my statusport is 01. But...
  12. J

    Godbout Interfacer 1 stops Imsai´s front panel...

    Hello. I own godbout interfacer 1 serial card. When i mount it to my imsai 8080 motherboard, i cannot examine or deposit anymore. Imsai seems to be blocked out. Now, with my logic probe, i checked the 74xx logic chips, they seem to be fine. Which signal on S100 can stop the system ? First, i...
  13. J

    Imsai 8080 cannot examine to RAM adress...

    So, i made also the measurement from your last posting. But with all data lines. My logic analyzer has 16 channels. Ch0 = pSYNC Ch1 = U11-3 Ch2 = D0 Ch3 = D1 Ch4 = D2 Ch5 = D3 Ch6 = D4 Ch7 = D5 Ch8 = D6 Ch9 = D7 What do you think about this picture ? THX Jan
  14. J

    Imsai 8080 cannot examine to RAM adress...

    Hello. I checked again the pin´s from your schematic. Now, every signal is fine. Take a look: Then, today i´ve got my ordering of logic chips and my new plug for the flat cable. I swapped all logic chips on frontpanel except 8T97N and 7427. One by one. But no changes. I cannot examine memory...
  15. J

    Imsai 8080 cannot examine to RAM adress...

    So, i checked something. There are cables on the back of the pcb. I checked them with manual, they are correctly ! Then, i made your measurement. I switched on the imsai and pushed examine. CH0 = U18 - 12 CH1 = U10 - 12 CH2 = U12 - 8 CH3 = U14 - 6 GND = U10 - 7 Then i connected logic...
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