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  1. Thread: Multibus

    by Gary C
    Replies
    5
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    71

    The reset cards still work perfectly after what...

    The reset cards still work perfectly after what must be 35 years, love the (CEGB) 9B bit on the bottom, were they hand etched ? The development of the system must have been really interesting and I...
  2. Thread: Multibus

    by Gary C
    Replies
    5
    Views
    71

    Not sure I will find any more cards and not sure...

    Not sure I will find any more cards and not sure how much I will be able to achieve with this, but happy its up and running.

    Boot roms we use at work contain code for network boot, tape boot and...
  3. Thread: Multibus

    by Gary C
    Replies
    5
    Views
    71

    Multibus

    Just had to post

    We use multibus at work and when I saw some similar cards for sale I had to get them.

    However, could I get them to work ?

    The card frame was multibus without the iLBX...
  4. My favourite would be a TEAC FD-55B or FD-55BR...

    My favourite would be a TEAC FD-55B or FD-55BR but almost any 40 track double sided 5 1/4 floppy drive will work.
  5. yes, but you can at least see if any are shorted,...

    yes, but you can at least see if any are shorted, then you have to go one by one if none have any discolouration.
  6. The tandon is probably not able to read the disk...

    The tandon is probably not able to read the disk formatted in the 1.2mb drive. The track is being recorded too narrowly to give enough flux to drive the big old Tandons read head. A 40 track drive...
  7. First thing would be to measure the voltage at...

    First thing would be to measure the voltage at the board, is the PSU shutting down ? ( i believe some still spin the fan when shutdown) which would indicate a bad tantalum or you could measure the...
  8. Are you transferring the system files to the...

    Are you transferring the system files to the newly formatted disk with the SYS command to make it bootable ?

    Just noted you are using an imaging program, is that writing a complete bootable image...
  9. The other option is to remove the drive from your...

    The other option is to remove the drive from your XT and connect it into your other PC, set BIOS and boot up MS DOS, then you know it will work.

    Page 4 of this thread...
  10. Thread: Sharp MZ-80K

    by Gary C
    Replies
    0
    Views
    34

    Sharp MZ-80K

    Might as well start a thread on my latest machine

    Bought a Sharp MZ-80K 5 months ago, and because of this virus thing, only just managed to pick it up.

    62613

    Love the details like the hinged...
  11. Yay, result ! Certainly check the heads move...

    Yay, result !

    Certainly check the heads move freely first, it reduces the load on the drive path and future damage.

    Jealous of your keyboard :), mine had its changed to a contemporary none IBM...
  12. Probably not useful, but using the Debug method...

    Probably not useful, but using the Debug method to test memory with the parity turned off, I could write a pattern to a block of memory then change the switches while the machine was running and see...
  13. fingers crossed !

    fingers crossed !
  14. Naughty ! that would cause a bit of a pop in the...

    Naughty ! that would cause a bit of a pop in the UK
  15. The loss of continuity wont help ! but the gunk,...

    The loss of continuity wont help ! but the gunk, not sure.
  16. Certainly the clip is for ground but its normally...

    Certainly the clip is for ground but its normally connected to the scopes ground which is normally the same as the earth on the scopes case and therefore the PC so there is not normally a need to...
  17. I am wondering about that intensity signal, it...

    I am wondering about that intensity signal, it should be doing something

    from here https://www.seasip.info/VintagePC/mda.html

    The 'video' and 'high intensity' pins have four possible...
  18. Ground on a scope is something to be careful of....

    Ground on a scope is something to be careful of. Its not like using a multimeter where you measure a voltage across a component. On most scopes, the ground is connected to earth, so all you need to...
  19. Sorry, its difficult to know how much experience...

    Sorry, its difficult to know how much experience people have :)

    So check

    Need clear triggered waveform from pin 7 & 6 of the video card, then

    1 the signal from pin 7 should be present in...
  20. Thread: Lightning eek

    by Gary C
    Replies
    2
    Views
    60

    Lightning eek

    Watching the most amazing light show.

    All around the station are huge storms that have been flashing and banging for the last 4 hours showing no signs of stopping. Got some great video of fork...
  21. Replies
    5
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    104

    Or scrape the squalene from the side of your nose...

    Or scrape the squalene from the side of your nose where it joins the face (really !) and wipe it down the guide rails.

    It works, trust me.

    No really !!
  22. From what I can see its not a standard 27xx EPROM...

    From what I can see its not a standard 27xx EPROM and so you need to an adapter to use a standard EPROM.
    See http://mail.minuszerodegrees.net/5150/basic/5150_cassette_basic.htm
  23. Normal aluminium oxide corrosion, its a highly...

    Normal aluminium oxide corrosion, its a highly reactive metal. Most of my old drives have similar.
  24. Need to adjust the trigger so it stabilises the...

    Need to adjust the trigger so it stabilises the image but I imagine the faint line is the repeated overlayed image of the peak of the wave forms so it looks as if you have a video signal.

    Using...
  25. Cant quite make out if there is an AC wave form...

    Cant quite make out if there is an AC wave form there !
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