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  • Gary C's Avatar
    Yesterday, 02:15 PM
    Well, just get a 0.5 ohm 50W resistor ...
    5 replies | 38 view(s)
  • Gary C's Avatar
    Yesterday, 05:05 AM
    Gary C replied to a thread Sharp MZ-80K in Other
    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...
    9 replies | 328 view(s)
  • Gary C's Avatar
    September 18th, 2020, 07:34 PM
    Gary C replied to a thread Sharp MZ-80K in Other
    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...
    9 replies | 328 view(s)
  • Gary C's Avatar
    September 18th, 2020, 04:16 AM
    Gary C replied to a thread Sharp MZ-80K in Other
    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...
    9 replies | 328 view(s)
  • Gary C's Avatar
    September 17th, 2020, 09:37 AM
    Gary C replied to a thread DEC equipment - UK only. in DEC
    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...
    27 replies | 1037 view(s)
  • Gary C's Avatar
    September 15th, 2020, 03:08 AM
    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...
    4 replies | 185 view(s)
  • Gary C's Avatar
    September 14th, 2020, 02:25 AM
    Gary C replied to a thread Multibus in Other
    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 !...
    27 replies | 1226 view(s)
  • Gary C's Avatar
    September 14th, 2020, 02:11 AM
    Gary C replied to a thread DEC equipment - UK only. in DEC
    lol, yes. Forgot about the bridge works since I have been off.
    27 replies | 1037 view(s)
  • Gary C's Avatar
    September 13th, 2020, 01:23 AM
    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...
    4 replies | 185 view(s)
  • Gary C's Avatar
    September 12th, 2020, 10:09 AM
    Gary C replied to a thread DEC equipment - UK only. in DEC
    Oooh, of course :)
    27 replies | 1037 view(s)
  • Gary C's Avatar
    September 12th, 2020, 09:15 AM
    Gary C replied to a thread DEC equipment - UK only. in DEC
    Not had one ?
    27 replies | 1037 view(s)
  • Gary C's Avatar
    September 12th, 2020, 01:46 AM
    Gary C replied to a thread Sharp MZ-80K in Other
    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...
    9 replies | 328 view(s)
  • Gary C's Avatar
    September 11th, 2020, 03:23 AM
    Gary C replied to a thread DEC equipment - UK only. in DEC
    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...
    27 replies | 1037 view(s)
  • Gary C's Avatar
    September 11th, 2020, 02:18 AM
    Gary C replied to a thread Sharp MZ-80K in Other
    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...
    9 replies | 328 view(s)
  • Gary C's Avatar
    September 10th, 2020, 01:54 PM
    Gary C replied to a thread Sharp MZ-80K in Other
    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...
    9 replies | 328 view(s)
  • Gary C's Avatar
    September 8th, 2020, 12:19 AM
    Hence my link which has everything you could ever need in a single box :)
    17 replies | 574 view(s)
  • Gary C's Avatar
    September 6th, 2020, 02:39 AM
    Gary C created a blog entry Wife thinks I am mad in Gary C
    So the PSU of the MZ-80K has been reunited with the computer and it works. Monitor is clear and bright with no screen burn. The rest of the computer...
    0 replies | 106 view(s)
  • Gary C's Avatar
    September 6th, 2020, 02:03 AM
    Gary C replied to a thread DEC equipment - UK only. in DEC
    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...
    27 replies | 1037 view(s)
  • Gary C's Avatar
    September 5th, 2020, 02:41 PM
    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...
    8 replies | 214 view(s)
  • Gary C's Avatar
    September 5th, 2020, 03:10 AM
    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...
    8 replies | 214 view(s)
  • Gary C's Avatar
    September 5th, 2020, 01:30 AM
    Gary C replied to a thread DEC equipment - UK only. in DEC
    Would'nt mind the microvx II
    27 replies | 1037 view(s)
  • Gary C's Avatar
    September 5th, 2020, 01:25 AM
    Gary C replied to a thread Multibus in Other
    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...
    27 replies | 1226 view(s)
  • Gary C's Avatar
    September 3rd, 2020, 11:16 AM
    Gary C replied to a thread Sharp MZ-80K in Other
    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...
    9 replies | 328 view(s)
  • Gary C's Avatar
    September 3rd, 2020, 07:40 AM
    Wow, thats mad ! Would never have though. Can see whe IBM used three legged tant capacitors.
    23 replies | 457 view(s)
  • Gary C's Avatar
    September 1st, 2020, 07:45 AM
    Gary C replied to a thread Multibus in Other
    Hopefully they are real, sourced from Germany, but at 5 that's no guarantee but worth a try.
    27 replies | 1226 view(s)
  • Gary C's Avatar
    September 1st, 2020, 07:04 AM
    I imagine they are miss labeled much lower voltage caps. Certainly, experimenting with caps in my apprenticeship (along with the bin bag full of...
    23 replies | 457 view(s)
  • Gary C's Avatar
    September 1st, 2020, 04:59 AM
    What make of board is it ?, certainly my 5160 XT board cant take SIPP memory so I am assuming its not an IBM product ?
    7 replies | 284 view(s)
  • Gary C's Avatar
    September 1st, 2020, 04:57 AM
    Gary C started a thread 8096 ? in Commodore
    https://www.ebay.co.uk/itm/Commodore-CBM-8096-computer-UNTESTED-for-SPARES-REPAIRS-RESTORATION/274469190271 I think I am right in that this...
    11 replies | 331 view(s)
  • Gary C's Avatar
    September 1st, 2020, 04:52 AM
    Gary C replied to a thread Multibus in Other
    Thanks Dave i'm sure I'm going to be asking questions, hope I don't become a pain :) One thing someone might know. My 286/10 card has an...
    27 replies | 1226 view(s)
  • Gary C's Avatar
    August 31st, 2020, 11:50 PM
    Gary C replied to a thread Multibus in Other
    Progress to date I have the 286/10 up and running in a way. I have the original Intel monitor roms and can execute code from the prompt. I have...
    27 replies | 1226 view(s)
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About Gary C

Basic Information

About Gary C
Biography:
Started with the UK national electricity company, the CEGB in 1983. Moved in to engineering and worked on DPS6, Intel Multibus, DEC VAX/PDP and programmed in CEGB CUTLASS.
Now in operations
Location:
Lancashire
Interests:
Vintage computers and old cars
Occupation:
Assistant shift manager - Nuclear operations

Signature


Current fleet
TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - VAX 3100,3300,4000VLC & 4000 Model 96 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - DEC Micro PDP 11/73 - IBM 5160 XT - Multibus 286/10 - Alpha server - MicroVax II.

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575
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Today 04:27 AM
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May 26th, 2018
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Recent Entries

Wife thinks I am mad

by Gary C on September 6th, 2020 at 02:39 AM
So the PSU of the MZ-80K has been reunited with the computer and it works. Monitor is clear and bright with no screen burn. The rest of the computer on the other hand is filthy. The keyboard keys are sticking and some of the graphic keys have labels under the plastic covers, obviously to represent a numeric keypad for some program.

Keyboard has now been stripped, this required desoldering of every keyswitch, but after that they pop out of the frame as easy as anything and the keytops

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Further adventures of Multibus

by Gary C on August 19th, 2020 at 12:07 PM
Finally got my 286/10 processor running in my multibus rack.

I wire wrapped a iLBX bus between the CPU and memory cards but it wasn't starting on power up. In the end it wasn't getting a clean reset so I have now wired up a toggle switch to the Multibus master reset line and now it starts with a memory check (i think, it gives a row of 0 0 0) then the intel monitor program welcome message).

Next issue is software. Not sure if I will program it myself with a simple OS,

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Thats Sharp

by Gary C on August 9th, 2020 at 04:54 AM
Bought an MZ80K for a very reasonable price 6 months ago and have just been able to pick it up owing to the distance and the lock down.

Love the design details, like the support for the case lid and the little screw to lock the support into place
And the internal monitor controls all nicely labelled.

Unplugged the PSU from the board and powered up, nothing. Strangely there is no fuse on the rear of the computer, but there are five inside the PSU case and the mains

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Updated August 10th, 2020 at 06:07 AM by Gary C

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5160 rides again

by Gary C on August 4th, 2020 at 09:22 AM
The 5160 has been restored to good health.

The case has finally been filled and sprayed. Pantone 413U seems to be a reasonable match, it has that greenish tinge but seems quite a bit lighter, however after sanding down the case it became apparent that the original paint was very very dirty so it might be spot against a new machine. For the bezel I used some BMW mini pepper white spray and that looks reasonable too.
Due to the extensive damage to the metal case, it lost a lot of

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Updated August 4th, 2020 at 09:34 AM by Gary C

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What a difference a day makes

by Gary C on July 21st, 2020 at 09:53 AM
I have been trying to repair the corroded tracks of my Quadboard, but there are more than I originally thought. Having a look at ebay has bought a ram bare clone board to my attention for a very keen price. Given I have all the correct chips, its probably worth trying to see if that card will work first.

Bezel of the 5160 has been glued and filled and now to spraying. I have found a great colour match in BMW mini pepper white but its the finish that might be difficult. I have given

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