Search found 2240 matches

by 1024MAK
Sat Mar 23, 2019 12:55 pm
Forum: ZX Spectrum Lounge
Topic: Sinclair Zx Spectrum: absolutely better ...
Replies: 9
Views: 1379

Re: Sinclair Zx Spectrum: absolutely better ...

I think you may be waiting a long time for any changes to be made...

Maybe a translation site would help...

Mark
by 1024MAK
Wed Mar 20, 2019 9:50 pm
Forum: Hardware
Topic: ZX81 16k ram pack mod with 8118
Replies: 1
Views: 101

Re: ZX81 16k ram pack mod with 8118

For an issue 3 board, I suggest you do the following: Remove: R3 (2.2k), D1 (BA157 or BA221), D2 (1N4002), D4 (12V Zener), D8 (5.1V Zener) and the coil. Remove all the existing 4116 (or equivalent) DRAM chips. Confirm by visual inspection that the only components connected to the former +12V supply ...
by 1024MAK
Wed Mar 20, 2019 7:47 pm
Forum: Hardware
Topic: Keyboard Issues .. Some keys not working (new membrane)
Replies: 11
Views: 158

Re: Keyboard Issues .. Some keys not working (new membrane)

The only oddity I have found so far is the resistor pack just above the keyboard set. The centre post (The one I have an issue with) is reading around 6k resistance whilst the rest read 10k (Correct according to schematic) .. Could this be my issue.. or more of an indicator of an issue RP3? These a...
by 1024MAK
Wed Mar 20, 2019 4:33 pm
Forum: Hardware
Topic: Keyboard Issues .. Some keys not working (new membrane)
Replies: 11
Views: 158

Re: Keyboard Issues .. Some keys not working (new membrane)

See this post for pictures of an unpopulated issue 1 board ;-)

Mark
by 1024MAK
Wed Mar 20, 2019 4:29 pm
Forum: Hardware
Topic: Keyboard Issues .. Some keys not working (new membrane)
Replies: 11
Views: 158

Re: Keyboard Issues .. Some keys not working (new membrane)

How have you tested for short circuits?

You really need to test between KBD2 and any other track/trace / circuit that may run close to the KBD2 track/trace / pin. Not just to the +5V and 0V/GND lines.

Mark
by 1024MAK
Sat Mar 16, 2019 9:18 am
Forum: Hardware
Topic: ZX81 Mod
Replies: 1
Views: 114

Re: ZX81 Mod

Not seen the video yet. But just going on the photo, the 74LS32 chip is four two input OR gates. It is mounted on what looks like some prototyping matrix board that either has a tinned ground plane on top or it is painted silver. It’s not a metal heatsink. I would speculate that the OR gates in the ...
by 1024MAK
Fri Mar 15, 2019 7:34 pm
Forum: Software
Topic: Converting TAP to WAV files for Spectrum
Replies: 5
Views: 237

Re: Converting TAP to WAV files for Spectrum

McKlaud wrote:
Fri Mar 15, 2019 5:23 pm
@Andy Rea: yes, some software would not work on +3 series due to lack of the floating bus in this model.
There is a bodge fix for this problem. But the lack of a “floating bus” will not prevent loading.

Mark
by 1024MAK
Fri Mar 15, 2019 12:34 pm
Forum: Software
Topic: Converting TAP to WAV files for Spectrum
Replies: 5
Views: 237

Re: Converting TAP to WAV files for Spectrum

The ZX Spectrum +3 may need an audio source with a louder signal. Often an amplifier is needed. Also note that although the socket on the +3 is a two channel “stereo’ 3.5mm type, one channel is tape/sound out, the other channel being the input from the cassette tape. So either a special cable is nee...
by 1024MAK
Thu Mar 14, 2019 1:12 pm
Forum: Hardware
Topic: Hello All & Dead ZX .. probably
Replies: 16
Views: 497

Re: Hello All & Dead ZX .. probably

Good to hear that you are up and running (well, once you have sorted the keyboard) :D

Mark