Search found 152 matches

by Fwapp
Thu Mar 23, 2017 8:53 pm
Forum: Hardware
Topic: "Different" ZX81's
Replies: 201
Views: 73828

Re: "Different" ZX81's

Yep - some really nice Zeddies :)
by Fwapp
Tue Mar 21, 2017 10:06 am
Forum: Hardware
Topic: "Different" ZX81's
Replies: 201
Views: 73828

Re: "Different" ZX81's

I have PM'd :)
by Fwapp
Mon Mar 20, 2017 10:22 pm
Forum: ZX BASIC
Topic: Checking the ROM
Replies: 7
Views: 5083

Re: Checking the ROM

Quite funny this, I decided to try and write a little basic program the other night to make it easy to check if the user has a original bugged, bugged and fixed with the kludge on the Z80 or fixed rom. I based it on a table I found on the net. Balford of this manor helped me with the hard maths bit ...
by Fwapp
Mon Mar 20, 2017 10:17 pm
Forum: Hardware
Topic: "Different" ZX81's
Replies: 201
Views: 73828

Re: "Different" ZX81's

One of the things I love about buying these is that you never know what you will find when you open the case! Lardo Quite true - always exciting to open one up and see what you've got - then have a play :) There are two other types of ZX81 I'm after now - one is a US issue 3 ZX81 (not a TS1000) and...
by Fwapp
Mon Mar 20, 2017 9:32 pm
Forum: Hardware
Topic: "Different" ZX81's
Replies: 201
Views: 73828

Re: "Different" ZX81's

A slightly more recent ZX81. Also working, well, apart from the keyboard. Need to see if trimming it down will help. IMG_5669.JPG Well now - you've got one of those ULA's! :) I reckon they are 2C184e ULA, but not as you normally see them with the ULA code marked on top. The 2C184e first appeared 81...
by Fwapp
Mon Mar 20, 2017 1:49 pm
Forum: Hardware
Topic: "Different" ZX81's
Replies: 201
Views: 73828

Re: "Different" ZX81's

Wooop! Dead chuffed to have an early-as-you-can-get ZX81 - especially as this one works :D

8102.jpg
8102.jpg (120.52 KiB) Viewed 3355 times
by Fwapp
Mon Feb 27, 2017 9:24 pm
Forum: Hardware
Topic: "Different" ZX81's
Replies: 201
Views: 73828

Re: "Different" ZX81's

It's a list I've put together - I'm a little bit sad in that I like to understand timelines and the like :lol:

Thanks for your numbers, I'll pop it in the list as well.
by Fwapp
Mon Feb 27, 2017 2:37 pm
Forum: Hardware
Topic: "Different" ZX81's
Replies: 201
Views: 73828

Re: "Different" ZX81's

Thanks Lardo - you're a good'un :) I've been trying to figure the numbers on the back of ZX81 ULA's - it's dead easy with 2c158e ULA's - convinced it's the batch number - so those made in 8102 were batch 1, 8106 batch 2 etc. It also points to datecodes that I've not seen :) It all goes random after ...
by Fwapp
Sun Feb 26, 2017 3:51 pm
Forum: Hardware
Topic: "Different" ZX81's
Replies: 201
Views: 73828

Re: "Different" ZX81's

I agree Moggy, its definitely a 2c158e - it's the batch number I'd like to confirm :)
by Fwapp
Sat Feb 25, 2017 5:32 pm
Forum: Hardware
Topic: "Different" ZX81's
Replies: 201
Views: 73828

Re: "Different" ZX81's

Oooh - 8109 date code ULA very nice! Like Moggy says, the next step in your quest is to acquire a kludge fixed ZX81, with that rather clever little PCB on the Z80 :D If you feel brave, could you pop the ULA out? I'm hoping it says 2C158E 03 on the bottom of it. BTW, anyone else think the earlier key...