Search found 1610 matches

by Andy Rea
Sat Jan 29, 2011 11:52 pm
Forum: Development
Topic: ZX81 clock, but this one is different !
Replies: 18
Views: 12783

Re: ZX81 clock, but this one is different !

Whooey, i can read and write data to the RTC chip, bit banging i2c bus :) pretty pleased since as the last time i did any kind of bit banging i was in control of both sides so could pretty much do what ever i liked, but this time i had to write routines to conform with some other and previously unkn...
by Andy Rea
Sat Jan 29, 2011 12:30 am
Forum: Hardware
Topic: New Hardware Projects
Replies: 88
Views: 43926

Re: New Hardware Projects

Looking good, hope it's trouble free when it comes to testing.

Regards Andy
by Andy Rea
Sat Jan 29, 2011 12:29 am
Forum: Development
Topic: ZX81 clock, but this one is different !
Replies: 18
Views: 12783

Re: ZX81 clock, but this one is different !

RTC chip turned up today, so thats been added to the project, hard drive a bit noisey to leave running all the time. so with addition of RTC should be able to turn it off and when next powered up the correct time can be restored. Well thats the plan anyway, still got to think how to do this bit bang...
by Andy Rea
Fri Jan 28, 2011 8:38 pm
Forum: GAMES
Topic: While we are releasing games...
Replies: 5
Views: 6534

Re: While we are releasing games...

Yes, i wrote those too, mastermind is ok for what it is a zx80 program, which was written on my homebuilt zx80 before i robbed parts of it :lol: Mine field would be better if it was written in assembler, but it was for the crap game competion after all. Must try harder to write more programs, but la...
by Andy Rea
Thu Jan 27, 2011 6:06 pm
Forum: Hardware
Topic: New Hardware Projects
Replies: 88
Views: 43926

Re: New Hardware Projects

Doh... it's not right, another look at your logic, if you can remeber what it was supposed to be doing. Keep at it i'm sure you'll crack it :)
by Andy Rea
Thu Jan 27, 2011 5:59 pm
Forum: WANTED
Topic: Wanted ZX81 and ZX80
Replies: 2
Views: 7197

Re: Wanted ZX81 and ZX80

Hi,

There is usually ZX81 for sale on ebay, condition and price do fluctuate, ZX80 turn up from tim to time but nowhere as often of course you'll pay more for ZX80.

Regards Andy

P.s. Welcome to the forum.
by Andy Rea
Wed Jan 26, 2011 11:28 pm
Forum: Development
Topic: ZX81 clock, but this one is different !
Replies: 18
Views: 12783

ZX81 clock, but this one is different !

things you will need... 1) old 3.5" disk drive (5400rpm) preferably with 2 platters. 2) some really bright rgb led's 3) IO interface. 4) ZX81 of course ! take the cover off old hard drive and rip out the heads and servo mechanismn (ooo yeah that never gonna work again), take off the platters and cut...
by Andy Rea
Wed Jan 26, 2011 9:19 pm
Forum: Sinclair Misc
Topic: your zx81 life story...
Replies: 10
Views: 8320

Re: your zx81 life story...

But playing around with ZX81 was much more exciting.
Peter you hit the nail right on the head :D

73's G7TLA ;)
by Andy Rea
Wed Jan 26, 2011 7:58 pm
Forum: Sinclair Misc
Topic: your zx81 life story...
Replies: 10
Views: 8320

your zx81 life story...

Have you always been a zx81 fan? i had my first zx81, indeed my first computer way back in '81 complete with 16k rampack (the wobbly version of course ;) ) a few years later i packed the zeddy away and moved onto a commodore pet, then vic 20, had the Vic for literraly ages before aquiring a spectrum...
by Andy Rea
Wed Jan 26, 2011 6:07 pm
Forum: Hardware
Topic: New Hardware Projects
Replies: 88
Views: 43926

Re: New Hardware Projects

excellent, work Charlie, yes i have seen the mmc thread it's come a long way in 2 years i dare say it's starting to look like a professional job, something that back in the day people would i'm sure have been happy to spend mega bucks on. you could easily make it composite output you just need to ad...