Search found 31 matches

by vwbz80a
Sun Feb 18, 2018 9:50 pm
Forum: Hardware
Topic: TI99/4a (corrected) Keyboard (membrane) Rebuild.
Replies: 10
Views: 1204

Re: TI99/4 (I think) Keyboard (membrane) Rebuild.

https://www.sinclairzxworld.com/viewtopic.php?f=7&t=2712&start=10#p29799 The keyboard map to adapt to ZX81... Just looked it over. Used the same diagram/table .. Not recommending this approach. NOT!!!! But I moved the cap tops over on the bottom row by 1 to the right . [ shift ] ,z,x,c,v,b,n,m, htt...
by vwbz80a
Thu Feb 15, 2018 1:04 pm
Forum: Hardware
Topic: TI99/4a (corrected) Keyboard (membrane) Rebuild.
Replies: 10
Views: 1204

Re: TI99/4 (I think) Keyboard (membrane) Rebuild.

gammaray wrote: ↑
Sun Feb 11, 2018 9:52 pm
I think you have the later '/4A keyboard since they tried to save money on production.

The '/4 keyboard was Chiclet type.

1979_TI-99-4.jpg

Charles
Correct. No Chiclet keys.

There is a Mitsumi # on the pictures.
The keyboard was a surplus item purchase back in '86-87. (cheap) :D
by vwbz80a
Thu Feb 15, 2018 1:01 pm
Forum: Hardware
Topic: TI99/4a (corrected) Keyboard (membrane) Rebuild.
Replies: 10
Views: 1204

Re: TI99/4 (I think) Keyboard (membrane) Rebuild.

gammaray wrote: ↑
Sun Feb 11, 2018 6:20 pm
What are the copper strips for if you have the membrane and PCB?
Copper strips are my attempt to replace the upper plastic /carbon tracks. πŸ˜‰
(Short answer)
by vwbz80a
Tue Feb 06, 2018 2:44 am
Forum: Hardware
Topic: TI99/4a (corrected) Keyboard (membrane) Rebuild.
Replies: 10
Views: 1204

Re: TI99/4 (I think) Keyboard (membrane) Rebuild.

This is my scan of keyboard pcb & top plastic membrane.
https://www.dropbox.com/s/kw7ebsb3m1fc5 ... 2.jpg?dl=0
;)
by vwbz80a
Mon Feb 05, 2018 4:59 pm
Forum: Hardware
Topic: TI99/4a (corrected) Keyboard (membrane) Rebuild.
Replies: 10
Views: 1204

Re: TI99/4 (I think) Keyboard (membrane) Rebuild.

gammaray wrote: ↑
Mon Feb 05, 2018 4:09 pm
Wow. Do you have time to show pictures? Yes I am excited by every design project!
https://www.dropbox.com/s/3g92kcwqdqy3r ... 4.jpg?dl=0
by vwbz80a
Mon Feb 05, 2018 4:06 pm
Forum: Hardware
Topic: TI99/4a (corrected) Keyboard (membrane) Rebuild.
Replies: 10
Views: 1204

TI99/4a (corrected) Keyboard (membrane) Rebuild.

Afternoon reading Dan Moore's post I gave mine a closer look. Boo! It WAS a membrane type. :cry: And it was no longer working with my TS1000. :cry: :cry: Tore it apart. The PCB seamed usable as did the key mechanisms. Experimented with strips of aluminum foil, then went looking for some copper foil ...
by vwbz80a
Wed Jan 31, 2018 2:22 pm
Forum: ZX BASIC
Topic: Who is up for a 1K BASIC challenge?
Replies: 6
Views: 1021

Re: Who is up for a 1K BASIC challenge?

PokeMon wrote: ↑
Wed Jan 31, 2018 10:23 am
Hmm why not let rain sausages ? :lol:
:lol:
by vwbz80a
Wed Jan 31, 2018 3:02 am
Forum: ZX BASIC
Topic: Who is up for a 1K BASIC challenge?
Replies: 6
Views: 1021

Re: Who is up for a 1K BASIC challenge?

Shaun_B wrote: ↑
Sun Dec 24, 2017 10:41 pm
Here's my starter for 10... supposedly a snow-fall type effect. Maybe not.
Edit: new revision here - SNOW.P
Will anyone do better?

Regards,

Shaun.
later than you think----- just now---- got it running in emu yea
:D :D :D :D
by vwbz80a
Wed Jan 24, 2018 10:52 pm
Forum: ZX BASIC
Topic: ZX80 4K ROM inverse characters
Replies: 7
Views: 866

Re: ZX80 4K ROM inverse characters

Hi, Yes, it's much easier to produce inversed characters on the Sinclair ZX81 so this is for the ZX80 only. However, if you want to inverse a string from an un-inversed string in ZX81, the principles are about the same (take the character code and add 128 to it). Thanks, Shaun. Thumbs up Shaun.
by vwbz80a
Wed Jan 24, 2018 4:35 pm
Forum: ZX BASIC
Topic: ZX80 4K ROM inverse characters
Replies: 7
Views: 866

Re: ZX80 4K ROM inverse characters

well, what do you know it does run......... on a zx80!!!! :lol: :lol: