Search found 2879 matches

by 1024MAK
Sun Apr 27, 2014 8:52 am
Forum: Hardware
Topic: looking for someone in London to help me troubleshoot a ZX81
Replies: 22
Views: 3572

Re: looking for someone in London to help me troubleshoot a

The plug used on the ZX81 end should be a mono plug due to the design of the mono socket on the ZX81 board.

Mark
by 1024MAK
Sat Apr 26, 2014 7:51 pm
Forum: Hardware
Topic: looking for someone in London to help me troubleshoot a ZX81
Replies: 22
Views: 3572

Re: looking for someone in London to help me troubleshoot a

See this thread for ZX81 chip pin-outs :mrgreen: Because the Z80 and everything connected to it works at a high frequency, there is only a limited amount of testing you can do with just a multimeter. Check the power pins (+5V pins marked +5V or Vcc) and the 0V/ground pins (marked GND or Vss) on each...
by 1024MAK
Sat Apr 26, 2014 7:27 pm
Forum: Hardware
Topic: looking for someone in London to help me troubleshoot a ZX81
Replies: 22
Views: 3572

Re: looking for someone in London to help me troubleshoot a

I've got a power supply, and have opened up the ZX81, to test the voltage across the points shown in your photo. I find 4.98 - 4.99 volts, which surprised me almost as much as Voyager's continuing to transmit. I also find that the heatsink heats up when the ZX is left plugged in. Good :D That shows...
by 1024MAK
Tue Apr 22, 2014 1:27 am
Forum: Development
Topic: The music-album made on ZX81+ZXpandAY+MrX! :)
Replies: 29
Views: 6951

Re: The music-album made on ZX81+ZXpandAY+MrX! :)

There is no doubt, Yerz is THE music man 8-) :D :mrgreen: :P :lol:

Mark
by 1024MAK
Sat Apr 19, 2014 4:12 am
Forum: Development
Topic: Transparent case for ZX80CORE
Replies: 28
Views: 6987

Re: Transparent case for ZX80CORE

Hi Karl

Very interested :D
I would like to preorder 2 transparent cases please.

I will send a PM later ;)

Mark
by 1024MAK
Mon Apr 14, 2014 11:49 pm
Forum: Sinclair Misc
Topic: Hi & Replica ZX80
Replies: 32
Views: 8789

Re: Hi & Replica ZX80

Welcome on board 4thseax!

:D :D :D

That machine of yours does look good 8-)

I hope it works as good as it looks ;)

Mark
by 1024MAK
Tue Apr 08, 2014 4:16 am
Forum: Hardware
Topic: Intermittent Memory Errors
Replies: 8
Views: 1401

Re: Intermittent Memory Errors

What kind of errors? details please ;)

Could be a refresh problem, or a multiplexer chip problem, or (I'm sure I can think of a few more...).

And I take it you have cleaned the edge-connector?

Mark
by 1024MAK
Sat Apr 05, 2014 6:45 pm
Forum: Sinclair Misc
Topic: ZX-Team Meeting Germany Webcam
Replies: 13
Views: 2770

Re: ZX-Team Meeting Germany Webcam

And is that a Memotech keyboard?
Webcam2.jpg
Webcam2.jpg (44.71 KiB) Viewed 1964 times
Mark
by 1024MAK
Sat Apr 05, 2014 6:43 pm
Forum: Sinclair Misc
Topic: ZX-Team Meeting Germany Webcam
Replies: 13
Views: 2770

Re: ZX-Team Meeting Germany Webcam

Look...
Someone using the computer that looks like it has a dk'tronics keyboard...
Webcam.jpg
Webcam.jpg (35.82 KiB) Viewed 1964 times
Mark
by 1024MAK
Sat Apr 05, 2014 6:15 pm
Forum: Sinclair Misc
Topic: ZX-Team Meeting Germany Webcam
Replies: 13
Views: 2770

Re: ZX-Team Meeting Germany Webcam

The nearest computer looks like it has a dk'tronics keyboard...

Mark