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  1. Replies
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    Well, just get a 0.5 ohm 50W resistor ...

    Well, just get a 0.5 ohm 50W resistor
    ...
  2. Thread: Sharp MZ-80K

    by Gary C
    Replies
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    337

    Ah ha ! The I/O request signal from the bus...

    Ah ha !

    The I/O request signal from the bus IORQB is present at the edge connector but not at IC1, corroded track under the IC. Chip removed and is fine, just need to remake the track. Rest of the...
  3. Thread: Sharp MZ-80K

    by Gary C
    Replies
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    337

    Found one ...

    Found one

    https://original.sharpmz.org/mz-80b/download/sm80fd.pdf

    Looks like the motor on signal is produced by a 2 to 4 line decoder 74S139 then latched in a 74S174. What is really odd, the...
  4. Thread: Sharp MZ-80K

    by Gary C
    Replies
    9
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    337

    I/O unit reassembled and all powered up. The FD...

    I/O unit reassembled and all powered up. The FD command responds with the BOOT DISK ? message so its reading the ROM on the disk interface board, but thats as far as it goes.

    It has a T3444M...
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    Cheers Dave Great to meet up today. Paul...

    Cheers Dave

    Great to meet up today.

    Paul (PG31) I have the storage unit box, so let me know and I can drop it off with you (not sure what it had in it, disks I imagine Dave still has)
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    Love the history, this at the end of the day is...

    Love the history, this at the end of the day is what its all about.

    Its always difficult as, like classic cars, anything is worth what someone wants to pay, but an 8080 on its own has sold...
  7. Thread: Multibus

    by Gary C
    Replies
    27
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    1,264

    CPU back in service, problem with my home made...

    CPU back in service, problem with my home made iLBX bus.

    Now my PC that I use as a terminal has exploded. Big bang and sparks out of the grille !

    PSU was a NOS and insides are as clean as...
  8. Replies
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    lol, yes. Forgot about the bridge works since...

    lol, yes.

    Forgot about the bridge works since I have been off.
  9. Replies
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    Hummm Would love the IMSAI, but i suspect I...

    Hummm

    Would love the IMSAI, but i suspect I would never be able to afford it.

    Might be worth giving an idea where you are (at least which country) and if it has to be collection or if delivery...
  10. Replies
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    Oooh, of course :)

    Oooh, of course :)
  11. Replies
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    Not had one ?

    Not had one ?
  12. Thread: Sharp MZ-80K

    by Gary C
    Replies
    9
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    337

    Noo, no caps in the drawers, all used up. RS...

    Noo, no caps in the drawers, all used up.

    RS to the rescue, glad I still get free next day delivery as it makes ordering things like this stupidly expensive from Farnell.
    I seem to have ended up...
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    Hum, think I know where this lot came from :) ...

    Hum, think I know where this lot came from :)

    I can give a hand on the 17th. Can hold some items as well for people if they can't manage that date.

    I am away until the 16th


    #### edit ###
    ...
  14. Thread: Sharp MZ-80K

    by Gary C
    Replies
    9
    Views
    337

    Oh I love the smell of burning RIFA's in the...

    Oh I love the smell of burning RIFA's in the morning.

    Powered up the expansion box to the crackle and smoke of a gently combusting RIFA :). I know I could have replaced them by rote but, ah well....
  15. Thread: Sharp MZ-80K

    by Gary C
    Replies
    9
    Views
    337

    Cheers I am going to try to get the floppy...

    Cheers

    I am going to try to get the floppy adapter working with a spare Gotek.

    First though, I am overhauling the keyboard. Most of the keys have poor resistance when pressed, so I have...
  16. Hence my link which has everything you could ever...

    Hence my link which has everything you could ever need in a single box :)
  17. Replies
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    How long would you be able to hold for ? And...

    How long would you be able to hold for ?

    And is the 3300 in a cabinet with a 240 supply ?

    mine is 110V and blown :( so I could take that too as spares.
  18. Replies
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    ideally you should be able to step the head to...

    ideally you should be able to step the head to any track so you can check its aligned on all tracks. So motor on, head loaded and in read and also be able to command to track 0 because when some...
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    Often a drive only needs a simple head alignment...

    Often a drive only needs a simple head alignment which can be done by using a scope to measure the head output after the amplifier then adjusting the head position to get the highest reading on a...
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    Would'nt mind the microvx II

    Would'nt mind the microvx II
  21. Thread: Multibus

    by Gary C
    Replies
    27
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    1,264

    Damn it, my CPU has stopped booting to monitor :(...

    Damn it, my CPU has stopped booting to monitor :(

    PSU looks ok, and by the look of the LED's the CPU is doing something, but its failing to give anything out of the serial port.

    One step...
  22. Thread: Sharp MZ-80K

    by Gary C
    Replies
    9
    Views
    337

    New & correct spec fuse fitted and PSU now powers...

    New & correct spec fuse fitted and PSU now powers up. 12V is a little high but probably poor open cct regulation so plugged into the board, switched on and...

    Greeted by "** MONITOR SP-1002" yay...
  23. Wow, thats mad ! Would never have though. ...

    Wow, thats mad !

    Would never have though.

    Can see whe IBM used three legged tant capacitors.
  24. Thread: Multibus

    by Gary C
    Replies
    27
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    1,264

    Hopefully they are real, sourced from Germany,...

    Hopefully they are real, sourced from Germany, but at 5 that's no guarantee but worth a try.
  25. I imagine they are miss labeled much lower...

    I imagine they are miss labeled much lower voltage caps. Certainly, experimenting with caps in my apprenticeship (along with the bin bag full of hydrogen + a long stick with a match on the end :) ),...
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