Search found 10 matches

by Retrogadgets
Mon Apr 15, 2019 8:15 pm
Forum: Sinclair Misc
Topic: Jupiter ACE (again)
Replies: 83
Views: 15664

Re: Jupiter ACE (again)

Hi.Claudius. Could you share the Gerber's. I want to order a couple in case I need this one up soldering. I shouldn't though. But me eye sight not as great as when I was younger.
by Retrogadgets
Wed May 16, 2018 9:34 am
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 15060

Re: zx spectrum in zx81 case

Got an oscilloscope now. Shall try as detailed above.
by Retrogadgets
Fri May 11, 2018 9:41 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 15060

Re: zx spectrum in zx81 case

Zx max 48 still has the weird picture.

Ive completely rewired the lead . The j4 is connected 2-3 and replaced the 74 ic with a philips 74hcu type and still the same.

The rgb signal is it pal or ntsc ? Or does it not work like that.


I dont have the AD chip fitted.
by Retrogadgets
Sat May 05, 2018 2:30 am
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 15060

Re: zx spectrum in zx81 case

Ordered some Philips 74HCU04's
by Retrogadgets
Fri May 04, 2018 11:15 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 15060

Re: zx spectrum in zx81 case

20180504_215847.jpg
Ive completely replaced all the ic's except the cpld. I'll try the 14mhz crystal as you said.
by Retrogadgets
Fri May 04, 2018 10:11 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 15060

Re: zx spectrum in zx81 case

I've swapped out the 7404 for a 74HCT04 from my spare clock board of a RC2014 setup. Same picture.

My 62256 rams are 100 speed and not 55 would this make a difference.

I took out the zx rom and still have the same picture.

I'll list out all the ic's and makes.
by Retrogadgets
Fri May 04, 2018 2:06 am
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 15060

Re: zx spectrum in zx81 case

WP_20180504_00_09_27_Pro.jpg
WP_20180504_00_08_25_Pro.jpg
by Retrogadgets
Fri May 04, 2018 1:55 am
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 15060

Re: zx spectrum in zx81 case

Finally have partly built the Zx Max 48, but when powered up i get a weird display i dont have the surface mount AD chip fitted, im running off the rgb. what is the minimum cable wiring for rgb, i dont have all the grounds connected in the scart plug, only one connected to pin 18. Can anyone help wi...
by Retrogadgets
Sat Jul 01, 2017 11:01 am
Forum: Hardware
Topic: New ZX81 16K SRAM modules available soon from ZX ZIGG
Replies: 8
Views: 1612

Re: New ZX81 16K SRAM modules available soon from ZX ZIGG

Wow, does it need any modifications to enable wilf richter hires routines to work ?
by Retrogadgets
Sun May 14, 2017 6:32 pm
Forum: Development
Topic: Minstrel ZX80 Clone
Replies: 12
Views: 2640

Re: Minstrel ZX80 Clone

I've built one. Everything works, except. Igot this black band on the left, as though extra screen. I'm using a 6.55 mhz crystal. May be its that. Thanks. Any ideas David Hi all, I'm curious if anyone here has built one of these yet? I was thinking about ordering a pcb to test it out. Best, -mark