Search found 842 matches

by Lardo Boffin
Sun Nov 18, 2018 7:23 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 25
Views: 1302

Re: Jupiter ACE (again)

Have you just listed 3 2 of these on eBay? :D
by Lardo Boffin
Sat Nov 17, 2018 9:26 am
Forum: Hardware
Topic: ZX81 rebuild
Replies: 139
Views: 10907

Re: ZX81 rebuild

I hooked up a keyboard borrowed from elsewhere and that works fine. Presumably I got the diodes the roght way round! Shortly after taking the photo of boulder crush the screen started jumping a bit - horizontally which is strange. It does this fairly consistently after a while. But only with hi-res ...
by Lardo Boffin
Thu Nov 15, 2018 10:55 pm
Forum: Hardware
Topic: ZX81 rebuild
Replies: 139
Views: 10907

Re: ZX81 rebuild

Yes. I keep forgetting about the tape scrubber. I originally socketed the new 6.5 MHz crystal so decided to remove the socket and solder it in. Did this and switched it on and got nothing. Arggghhh!!!! So I removed it and soldered in a reclaimed one from a nearly bare board and it worked straight aw...
by Lardo Boffin
Wed Nov 14, 2018 10:00 pm
Forum: Sinclair Misc
Topic: Should i move to Europe to acquire a ZX81?
Replies: 5
Views: 140

Re: Should i move to Europe to acquire a ZX81?

The ZX81 for sale in this thread is priced at £30.95 (plus postage). Using the exchange rate that Google uses gives a price of $40.11 USD (not including postage). Mark I am happy to get a postage quote for p&p on the linked zeddy if you are interested. It is a nice one with the famous maths bug. Fu...
by Lardo Boffin
Tue Nov 13, 2018 11:20 pm
Forum: Hardware
Topic: ZX81 rebuild
Replies: 139
Views: 10907

Re: ZX81 rebuild

Having swapped all of the chips and replaced the resonator I figured that the only things left that could be dodgy were the transistors. So I changed them.

0E1BEDD6-4B38-4E05-83DF-4DC9026BEBFD.jpeg

And there we go. A K again!

Now I just need to fit a video out without killing it...
by Lardo Boffin
Tue Nov 13, 2018 9:44 pm
Forum: SALES
Topic: Bugged ROM ZX81 up for adoption (PRINT SQR 0.25)
Replies: 3
Views: 858

Re: Bugged ROM ZX81 up for adoption (PRINT SQR 0.25)

Bump. Still here if anyone is interested?

Edit - taken.
by Lardo Boffin
Sat Nov 10, 2018 5:16 pm
Forum: Sinclair Misc
Topic: ZX81 with yellow serial number
Replies: 2
Views: 141

Re: ZX81 with yellow serial number

I did have one guy on eBay say that the serial numbers were eventually insisted upon by certain retailers such as WHSmiths. I asked him how he knew but he never replied. The only ones I have seen have been green and the serial number printed on the smooth recess to the right of the one shown. But he...
by Lardo Boffin
Sat Nov 10, 2018 10:57 am
Forum: Sinclair Misc
Topic: ZX81 with yellow serial number
Replies: 2
Views: 141

ZX81 with yellow serial number

Hello all

I saw this on eBay:-

5505A4B4-E08B-4AFB-AEC3-D9EA04A6F117.jpeg

I have not seen one with a yellow serial number before - just green ones. Close up it looks to be properly printed on.

Anyone any ideas what the story is with this one?

Lardo
by Lardo Boffin
Wed Nov 07, 2018 8:59 pm
Forum: Sinclair Misc
Topic: How bad was the wobble on the zx81
Replies: 14
Views: 368

Re: How bad was the wobble on the zx81

Wow. I have absolutely no use whatsoever for a zeddy with 1MB of RAM but I really want one! :shock:
by Lardo Boffin
Wed Nov 07, 2018 6:30 pm
Forum: Sinclair Misc
Topic: How bad was the wobble on the zx81
Replies: 14
Views: 368

Re: How bad was the wobble on the zx81

I often wondered why nobody built a bus extender with a socket for the zeddy side, a piece of flexible ribbon cable and then another socket. Instant isolation of most things. Certainly overly enthusiastic keyboard mashing anyway.