Search found 154 matches

by iturbez
Sun Jan 12, 2014 10:32 am
Forum: Software
Topic: GUI operating systems?
Replies: 21
Views: 14034

Re: GUI operating systems?

sirmorris wrote:This is great information - thanks for sharing! I'm sure there are a few people here who would love to make an interface.. :D
I'm sure, too!
by iturbez
Tue Dec 24, 2013 7:21 pm
Forum: Hardware
Topic: ZX81 Address lines gobblede gook!
Replies: 6
Views: 2463

Re: ZX81 Address lines gobblede gook!

Hi, Connie!

Can we see Mr Searle's diagram of 16K RAM pack?

Thanks in advance.
Regards.

EDIT: I've found it here: http://searle.hostei.com/grant/zx80/zx80.html
by iturbez
Mon Dec 16, 2013 9:50 pm
Forum: ZX BASIC
Topic: Software LO-RES
Replies: 12
Views: 6702

Re: Software LO-RES

Nice job!
Thanks!

And welcome to the forum!
by iturbez
Wed Dec 11, 2013 8:27 pm
Forum: Hardware
Topic: ZX81 White display
Replies: 17
Views: 7948

Re: ZX81 White display

Hi, Inaki (o debería decir: Hola, Iñaki) I've recently fixed a "dead ZX81 (see http://www.sinclairzxworld.com/viewtopic.php?f=7&t=1236 ), and I had to change both CPU and RAM chips. With old CPU, I had no video signal (black screen). As I changed CPU, I had a white screen with no cursor, the same as...
by iturbez
Mon Dec 02, 2013 4:24 pm
Forum: Hardware
Topic: more component questions, t1000 vs zx81
Replies: 7
Views: 3951

Re: more component questions, t1000 vs zx81

Take a look at http://www.electronics-tutorials.ws/cap ... cap_5.html

I hope this helps!
Regards.
by iturbez
Mon Dec 02, 2013 4:18 pm
Forum: Hardware
Topic: "Dead" ZX81 Issue 1
Replies: 17
Views: 9602

Re: "Dead" ZX81 Issue 1

TMAOne wrote:Did you figure it out yourself or find & use the ZX-Team mod page?
I used ZX-Team mod, in its simplest form. Only 16K available. but no wobble at all...
by iturbez
Sun Dec 01, 2013 9:37 pm
Forum: Hardware
Topic: "Dead" ZX81 Issue 1
Replies: 17
Views: 9602

Re: "Dead" ZX81 Issue 1

http://stardot.org.uk/forums/images/smilies/eusa_clap.gif http://stardot.org.uk/forums/images/smilies/eusa_clap.gif http://stardot.org.uk/forums/images/smilies/eusa_clap.gif Mark Thanks, Mark. Woo-hoo!! :D ps. was the original RAM 2x2114's or 1x4118(or 2016 - my original ZX81 used a 2016 2k chip bu...
by iturbez
Sun Dec 01, 2013 7:13 pm
Forum: Hardware
Topic: "Dead" ZX81 Issue 1
Replies: 17
Views: 9602

Re: "Dead" ZX81 Issue 1

Very good news! The Zeddy has come to life again! RAM was faulty. I've installed a 62256 chip and now I get a brilliant inverted "K" at the screen... I've connected an external Memotech keyboard, and I can see the little thing is alive! Another one saved from the rubbish. The Zeddy and me are happy ...
by iturbez
Sun Nov 17, 2013 8:54 am
Forum: Hardware
Topic: "Dead" ZX81 Issue 1
Replies: 17
Views: 9602

Re: "Dead" ZX81 Issue 1

Well... Good and bad news! I've measured signals with a 10X test probe... Oscillator is OK. CLOCK signal appears at PIN 6 of Z80... but no video signal at PIN 16 of ULA... I change Z80 CPU... VIDEO SIGNAL APPEARS AT PIN 16 OF ULA... So I power my TV on... I get a white screen, but no "K" cursor... W...
by iturbez
Wed Nov 13, 2013 11:46 pm
Forum: Hardware
Topic: "Dead" ZX81 Issue 1
Replies: 17
Views: 9602

Re: "Dead" ZX81 Issue 1

But isn't the resonator connected to pin 35 (not pin 36) ? Yes! You're right. I've tested on pin 35 (not 36)... I prefer to test on the clock output pin of the ULA, and the clock input pin on the Z80 CPU. Well... I will test on pin 14 of the ULA and pin 6 on Z80... Maybe tomorrow... Thanks a lot! :...