Search found 3104 matches

by 1024MAK
Fri Sep 18, 2020 10:31 pm
Forum: Sinclair Misc
Topic: (Fixed) Forum Issues - unable to move PMs between folders
Replies: 4
Views: 1089

Re: (Fixed) Forum Issues - unable to move PMs between folders

Since the forum software update earlier this week, I glad to say that this issue is resolved :D

I have just tried moving some private messages and it all worked okay.

So thank you to the system admin team 8-)

Mark
by 1024MAK
Fri Sep 18, 2020 10:20 pm
Forum: Hardware
Topic: Spectrum 128K +2A RF sound issues
Replies: 1
Views: 75

Re: Spectrum 128K +2A RF sound issues

Maybe someone has previously removed the ceramic capacitor (C24) that feeds sound to the RF output?

Mark
by 1024MAK
Thu Sep 17, 2020 6:10 pm
Forum: ZX Spectrum Lounge
Topic: 128k +2 Mysterious Videos issue.
Replies: 5
Views: 102

Re: 128k +2 Mysterious Videos issue.

Is the interference black, or does it include other colours?

Mark
by 1024MAK
Tue Sep 15, 2020 1:02 am
Forum: Sinclair Misc
Topic: ZXForth. Plagerism,clever marketing or something else?
Replies: 14
Views: 452

Re: ZXForth. Plagerism,clever marketing or something else?

Ah, yes, it could have been a clone of the ZX80, not the ZX81.

:oops: Sorry about that little mistake. It’s been rather a lot of years since I read about it...

Mark
by 1024MAK
Mon Sep 14, 2020 9:56 pm
Forum: Sinclair Misc
Topic: ZXForth. Plagerism,clever marketing or something else?
Replies: 14
Views: 452

Re: ZXForth. Plagerism,clever marketing or something else?

Sinclair had trouble legally trying to prevent unauthorised “clones” of the ZX81 being produced. So have a look at that bit of history to see how difficult it was in trying to protect your product and your copyright. And in some countries, at one time, for copyright to work, it had to registered. I’...
by 1024MAK
Sun Sep 13, 2020 6:46 pm
Forum: Sinclair Misc
Topic: ZXForth. Plagerism,clever marketing or something else?
Replies: 14
Views: 452

Re: ZXForth. Plagerism,clever marketing or something else?

Seeing as ZXforth was quite successful as a concept for the 81, why was the Jupiter Ace(dedicated Forth computer) an unmitigated failure? There is a big difference between adapting an existing machine and buying a “dedicated” Forth computer. The Jupiter Ace had the ZX Spectrum as competition... Mark
by 1024MAK
Sun Sep 13, 2020 1:03 am
Forum: Hardware
Topic: Spectrum 48 Iss 6A
Replies: 2
Views: 160

Re: Spectrum 48 Iss 6A

What is the state of the edge-connector?

I presume you have cleaned it?

But are all the contacts good? Are there any broken tracks between the edge-connector contacts and the Z80 / other destination?

Mark
by 1024MAK
Fri Sep 11, 2020 9:30 am
Forum: Hardware
Topic: TS1500 problems when using a ZX8-CCP
Replies: 6
Views: 488

Re: TS1500 problems when using a ZX8-CCP

Unfortunately TS1500 machines are not very common on this side of the Atlantic (Europe) which makes giving help and advice more awkward. There is a schematic for one version of the TS1500 available on line, but not of any other version (there are at least two different board revisions/versions). Goo...
by 1024MAK
Fri Sep 11, 2020 12:14 am
Forum: Hardware
Topic: TS1500 problems when using a ZX8-CCP
Replies: 6
Views: 488

Re: TS1500 problems when using a ZX8-CCP

A few pointers: First, the ULA in a TS1500 will have a slightly different output to the ULA chips used in ZX81 / TS1000 machines, so yes, the ZX8-CCP will probably need adjusting. Second, there are two adjustments - read Pokemon’s set-up instructions (should have been supplied with the ZX8-CCP). Car...
by 1024MAK
Wed Sep 09, 2020 9:51 pm
Forum: Hardware
Topic: lost in modifications 4A
Replies: 11
Views: 1632

Re: lost in modifications 4A

The transistor on top of the Z80 is the spider mod and is official. Any extra connections to C27 would have been to a reset button (push to make switch). The various capacitor, resistor and diode changes around the area of the right hand keyboard connector / speaker area are the DC-DC mod. However, ...