Search found 167 matches

by rune
Sun Sep 03, 2017 7:04 pm
Forum: Development
Topic: ZXmore - questions and answers (FAQ)
Replies: 131
Views: 26751

Re: ZXmore - questions and answers (FAQ)

I've bridged Pin 1 & 2, added the capacitor on the back and still no difference. :(

I've went over (almost) all IC pins with the soldering iron, nothing changed.

Could I use a 4Mhz Z80 to test?

Any other ideas appreciated. Meantime Im going to stop for tonight or I'll end up wrecking the board.
by rune
Sun Sep 03, 2017 6:14 pm
Forum: Development
Topic: ZXmore - questions and answers (FAQ)
Replies: 131
Views: 26751

Re: ZXmore - questions and answers (FAQ)

Thanks, I think I counted wrong way on Z80, 6 up from the bottom.

OK, I'll put the cap on the back and try again and check Pin 1 & 2.

I did spot your message about C33/34.

Thought I had finished for the night :) Ah well back out to the shed.
by rune
Sun Sep 03, 2017 3:48 pm
Forum: Development
Topic: ZXmore - questions and answers (FAQ)
Replies: 131
Views: 26751

Re: ZXmore - questions and answers (FAQ)

Hi, I've now completed the ZXMore and am in bother. This is whats on screen, The brighter bands are actually just one white and grey band. The vertical band to the right is bad pixels on the screen. http://www.weegieboard.co.uk/Images/ZXMoreTV.jpg The multicoloured LED doesnt come on when the reset ...
by rune
Mon Aug 28, 2017 10:43 pm
Forum: Development
Topic: ZXmore - questions and answers (FAQ)
Replies: 131
Views: 26751

Re: ZXmore - questions and answers (FAQ)

Thanks for the links and information. I have the docs already, but am a confused with the version numbers My ROM is marked as V2.1 with a date of 07/2017 and the CPLD? has a V2.19a with a date of 08/2017. I thought/hoped that this would have sub directories. But you say that V1.9 is the latest versi...
by rune
Sun Aug 27, 2017 9:36 pm
Forum: Development
Topic: ZXmore - questions and answers (FAQ)
Replies: 131
Views: 26751

Re: ZXmore - questions and answers (FAQ)

Thanks for that Pokemon & Mark. I have the 74HC85 and its in the PCB. I dont have much more to do now, just power, composite, Inductor, ROM switch and the pair of 2x5 resistor networks to go. All ordered except for the last two items. I can stand resistors vertically and don't need the switch immedi...
by rune
Mon Aug 21, 2017 9:31 pm
Forum: Development
Topic: ZXmore - questions and answers (FAQ)
Replies: 131
Views: 26751

Re: ZXmore - questions and answers (FAQ)

Thanks Mark, I'll wait for the current batch of bits to arrive and then assess whats needed to complete the board.

The alternatives are useful as they are inexpensive and worth trying.
by rune
Mon Aug 21, 2017 2:45 pm
Forum: Development
Topic: ZXmore - questions and answers (FAQ)
Replies: 131
Views: 26751

Re: ZXmore - questions and answers (FAQ)

Hi, Im getting the parts together for my ZX More. One chip I cant seem to get is a 74HCT85

Farnell dont stock them. eBay sellers want around 4.50 for one. What is the chip used for and can anyone advise where I can get one at a sensible price?
by rune
Sat Jul 15, 2017 7:36 pm
Forum: Hardware
Topic: ZX81 case screws
Replies: 11
Views: 1973

Re: ZX81 case screws

and here is my alternative, black one is original...

Image

Couple of quid for 200. If anyone needs any, PM and we can work something out for the price of p&p.
by rune
Wed Jul 12, 2017 8:58 pm
Forum: Hardware
Topic: ZX81 case screws
Replies: 11
Views: 1973

Re: ZX81 case screws

Well 3mm dont work. The heads are too tight in the recessed holes.
by rune
Wed Jul 12, 2017 5:05 pm
Forum: Hardware
Topic: ZX81 case screws
Replies: 11
Views: 1973

Re: ZX81 case screws

Thanks for the help, Looks like diameter is 2.2 and 9.5 or 6.5.

It those I got are too big, I'll look around the web for some.