Search found 1771 matches

by 1024MAK
Wed Nov 22, 2017 10:36 am
Forum: Emulators
Topic: SZ81 compiled for intel Mac OS-X
Replies: 14
Views: 322

Re: SZ81 compiled for intel Mac OS-X

@Barry - I don't have a Mac, but it looks like you are doing good work, so thanks for this 8-)

Mark
by 1024MAK
Wed Nov 22, 2017 10:30 am
Forum: Sinclair Misc
Topic: ZX80 rivets and Ram Pack progress
Replies: 1
Views: 55

Re: ZX80 rivets and Ram Pack progress

Great find :D

So are these available to buy? If yes, where from?

Mark
by 1024MAK
Tue Nov 21, 2017 4:30 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 13
Views: 205

Re: zx spectrum in zx81 case

8-) 8-) 8-) :D

However, it should have either a green or a red solder resist on the bottom :mrgreen:

Mark
by 1024MAK
Sun Nov 19, 2017 7:49 pm
Forum: Welcome Area
Topic: Hello Everyone
Replies: 5
Views: 71

Re: Hello Everyone

Hello Rdube123

Welcome to our forum.

I hope you like it.

Please join in any discussions you are interested in. The life blood of forums, is keeping the regulars awake by prodding them with questions :mrgreen:

Mark
by 1024MAK
Sun Nov 19, 2017 7:46 pm
Forum: Hardware
Topic: ZX81 rebuild
Replies: 58
Views: 1321

Re: ZX81 rebuild

I got new sockets from Sell My retro:- https://www.sellmyretro.com/offer/details/3473 They have four legs rather than the three in use on the zeddy. Do i just fold the unwanted one under or do i need to remove it? Currently I have reused an old one. Remove it or just cut it off. It's not fitted on ...
by 1024MAK
Sat Nov 18, 2017 11:44 pm
Forum: Hardware
Topic: ZX81 rebuild
Replies: 58
Views: 1321

Re: ZX81 rebuild

El cheapo logic probe for 5V TTL logic... If you have a spare 74LS14 or 74HCT14 logic chip, connect a test probe to a resistor (100 ohms to 180 ohms for a 74LS14, 330 ohms to 820 ohms for a 74HCT), then connect to any of the chips input pins. On the relevant output, connect a RED LED via a 390 ohm o...
by 1024MAK
Sat Nov 18, 2017 5:55 pm
Forum: Hardware
Topic: ZX81 rebuild
Replies: 58
Views: 1321

Re: ZX81 rebuild

It's not polarised, any way is fine. Except upside down :lol: If you have a 'scope or logic probe, check Z80 address lines A14 and A15. Also is you have a 'scope, test the video/TV output pin to see if it is switching between the three levels (high = white, "mid-way" = black and low= low part of th...
by 1024MAK
Fri Nov 17, 2017 1:29 am
Forum: Hardware
Topic: Heat sink on Spectrum ULA - is there any benefit?
Replies: 16
Views: 214

Re: Heat sink on Spectrum ULA - is there any benefit?

Chances are it would not get a huge amount of usage. Certainly never more than a couple of hours at a time anyway. Should not be a problem then ;) Heat level inside will be a lot lower than if used as originally manufactured (due to the switching regulator replacing the 7805), so the ULA should be ...
by 1024MAK
Thu Nov 16, 2017 6:29 pm
Forum: Hardware
Topic: Heat sink on Spectrum ULA - is there any benefit?
Replies: 16
Views: 214

Re: Heat sink on Spectrum ULA - is there any benefit?

It depends on a number of factors. First, the different issue ULAs produce different amounts of heat. The early types ran hot. The later ULAs used a lower power design, so run cooler (well, warm instead of hot). Second, yes the rubber key has poor ventilation. The plus keyboard is much better. Back ...
by 1024MAK
Wed Nov 15, 2017 1:41 pm
Forum: Hardware
Topic: A zeddy Christmas?
Replies: 6
Views: 122

Re: A zeddy Christmas?

The unicorn that Sir Morris promised with every release of the ZXpand. :lol: More seriously I already have my presents early in the shape of Andy Reas' UDG unit and UDG designer software and Sir Morris' MIDI firmware and MIDI player software for the ZXpand+. Nice low lit room plus a good single mal...