Search found 563 matches

by 1024MAK
Tue Jan 21, 2020 9:01 pm
Forum: Hardware
Topic: Spectrum plus composite signal degrading.
Replies: 3
Views: 210

Re: Spectrum plus composite signal degrading.

Hmm, you do understand that OFC is just marketing bull$h!t don’t you? Also a lot of cheap “screened” cables are lap screened (meaning they are not fully shielded, as there are spaces between the wires that form the screening). Proper co-ax cable has a much better braided screen and sometimes a foil ...
by 1024MAK
Tue Jan 21, 2020 2:51 pm
Forum: Hardware
Topic: ZX Spectrum Next Discussion
Replies: 217
Views: 18616

Re: ZX Spectrum Next Discussion

Backer Addresses - IMPORTANT! tl;dr: Go to Kickstarter, click on the Next campaign, Pledge and Survey. That's where you edit your address. Arnie says 'Do it now!' It's now or never: the Next is (at last!) about to ship, thus it is important that you check your address details on Kickstarter to ensu...
by 1024MAK
Tue Jan 21, 2020 2:38 pm
Forum: Hardware
Topic: Spectrum+ 48k repair
Replies: 42
Views: 1706

Re: Spectrum+ 48k repair

A 48K ZX Spectrum draws between 600mA and 700mA (with no expansions connected). 700mA is half the rated capacity of the Sinclair ZX Spectrum 9V 1,4A PSU. The output of the PSU is required not to drop below 9V at the full load current of 1.4A. The output voltage is not specified at other output curre...
by 1024MAK
Sat Jan 18, 2020 6:06 pm
Forum: Hardware
Topic: Another faulty ZX Spectrum 48K 3B
Replies: 2
Views: 169

Re: Another faulty ZX Spectrum 48K 3B

Looks like a RAM fault to me, it could be one of the ‘upper’ 32k bit DRAM chips, or a multiplexer chip failure (these feed the address lines to the DRAM chips). It could still be a failure of one of the 4116 ‘lower’ DRAM chips (a failure mode that is not showing up on screen). In any case, BASIC is ...
by 1024MAK
Sat Jan 18, 2020 5:40 pm
Forum: Hardware
Topic: The +2 grey and +3 PSUs
Replies: 2
Views: 128

Re: The +2 grey and +3 PSUs

The PSU for the grey +2 is very reliable. It is highly unlikely that a failure will kill the ZX Spectrum+2. So no need to replace it. The PSU for the +3 is less reliable, and it is in theory possible for a regulation failure to occur (that’s the problem that occurs with the C64 PSU), but this failur...
by 1024MAK
Wed Jan 15, 2020 6:54 pm
Forum: Hardware
Topic: Opus Discovery 3.5” Floppy Drive
Replies: 6
Views: 622

Re: Opus Discovery 3.5” Floppy Drive

The expansion bus on the edge-connector of the ZX Spectrum can’t be extended too far, otherwise strange and random symptoms will occur. Don’t forget this is the Z80 CPU bus (which is not buffered). As to whether the length that you want will work, I can’t tell you. However, the length of the cable b...
by 1024MAK
Sat Jan 11, 2020 6:56 pm
Forum: Sinclair Miscellaneous
Topic: +3 sound quality?
Replies: 10
Views: 252

Re: +3 sound quality?

animaal wrote:
Sat Jan 11, 2020 2:30 pm
If I had turned on a new +3 and heard the sound quality, I would probably have returned it, thinking it was faulty.
Apparently some people did...

Mark
by 1024MAK
Fri Jan 10, 2020 10:52 pm
Forum: Hardware
Topic: Power Supplies
Replies: 13
Views: 1562

Re: Power Supplies

Keep in mind, though, that if you’re planning to use the edge connector of the Spectrum, it’s best to proceed with caution when using peripherals that obtain their power from it. Pin 4A just passes through the positive voltage from the power supply directly. The Spectrum’s original PSU will drop it...
by 1024MAK
Thu Jan 02, 2020 11:00 pm
Forum: Hardware
Topic: 128K toastrack manuals
Replies: 8
Views: 303

Re: 128K toastrack manuals

As far as I’m aware, the ZX Spectrum+ (the 48K model with the new case & keyboard) was the first not to include the original orange covered, ring bound BASIC manual (although it is possible that there may be some versions that were perfect bound rather than ring bound, Sinclair did the same with the...
by 1024MAK
Tue Dec 31, 2019 3:30 pm
Forum: Sales/Commercial
Topic: Anyone interested in a brand new Sinclair ZX80 case?
Replies: 1
Views: 289

Anyone interested in a brand new Sinclair ZX80 case?

A member of the Sinclair ZX World forum is trying to get a run of brand new Sinclair ZX80 cases manufactured. He says this: I've been working hard recently in getting together different manufacturers in order to produce an EXACT copy of the Sinclair ZX80 case, either the original, or the later injec...