Search found 950 matches

by Ast A. Moore
Thu Apr 18, 2019 8:45 am
Forum: Emulators
Topic: Can't hear speech in "Ruairi Says Rectum"
Replies: 7
Views: 167

Re: Can't hear speech in "Ruairi Says Rectum"

The demo toggles Bit 3 of Port 254, instead of Bit 4. While on a real Spectrum both will generate sound (toggling Bit 3 normally produces a lower volume signal), strictly speaking, Bit 4 is the one that should be used for generating sound effects. On a real Spectrum, both are physically wired to a s...
by Ast A. Moore
Wed Apr 17, 2019 2:36 pm
Forum: Games/Software
Topic: Game of the day...
Replies: 214
Views: 16082

Re: Game of the day...

WIWC wrote:
Wed Apr 17, 2019 2:32 pm
Ok, it's crap.
Correction: it’s colorful crap.
by Ast A. Moore
Wed Apr 17, 2019 9:21 am
Forum: Programming
Topic: 3D Chess 2K18
Replies: 213
Views: 8950

Re: 3D Chess 2K18

arkannoyed wrote:
Wed Apr 17, 2019 8:33 am
does this all read ok, and make some sense?
You’re doing great. Keep going.
by Ast A. Moore
Tue Apr 16, 2019 11:38 pm
Forum: Brand new software!
Topic: New Software 2019
Replies: 87
Views: 7003

Re: New Software 2019

Horizontal scrolling isn’t difficult as far as color attributes are concerned if the background is just solid black. You just need to swap the ink and paper colors at cell boundaries. The scrolling itself at 50 fps is pretty impressive, I agree, but the active window size is fairly small. Hikaru mad...
by Ast A. Moore
Tue Apr 16, 2019 10:59 pm
Forum: Brand new software!
Topic: New Software 2019
Replies: 87
Views: 7003

Re: New Software 2019

djnzx48 wrote:
Tue Apr 16, 2019 10:27 pm
It would be really cool if something like that were able to run in real time, but I guess it would be too much for the Speccy to handle.
Did you miss this?
by Ast A. Moore
Tue Apr 16, 2019 10:32 pm
Forum: Hardware
Topic: Like a buss I wanted a Spectrum and ended up with 3
Replies: 12
Views: 208

Re: Like a buss I wanted a Spectrum and ended up with 3

Do Spectrums still run at 50Hz in the US then? I know there were a few different models over there, including the Timex and the NTSC Spectrum. The NTSC Spectrum used a different ULA and different crystal oscillators with frequencies that could be divided into the multiples needed to comply with the...
by Ast A. Moore
Tue Apr 16, 2019 10:08 pm
Forum: Hardware
Topic: Like a buss I wanted a Spectrum and ended up with 3
Replies: 12
Views: 208

Re: Like a buss I wanted a Spectrum and ended up with 3

Isn't the Spectrum PSU supposed to be unregulated? I've read in a few places online that the peaks of the input voltage are used to generate the 50Hz interrupt. Heh. No, that’s pretty ridiculous. :lol: The interrupt, as well all other intermediate frequencies are derived from a crystal oscillator (...
by Ast A. Moore
Tue Apr 16, 2019 9:07 pm
Forum: Hardware
Topic: Like a buss I wanted a Spectrum and ended up with 3
Replies: 12
Views: 208

Re: Like a buss I wanted a Spectrum and ended up with 3

patters wrote:
Tue Apr 16, 2019 9:01 pm
I bought a 1.5A tiny switched mode mobile phone charger sized thing for my 48K. I take it a DivMMC Future plus SD card won't pull much current?
The 48K Speccy draws around 700–900 mA typically. I doubt a DivMMC draws more than half an amp. I’m pretty sure you’re good.
by Ast A. Moore
Tue Apr 16, 2019 8:41 pm
Forum: Hardware
Topic: Like a buss I wanted a Spectrum and ended up with 3
Replies: 12
Views: 208

Re: Like a buss I wanted a Spectrum and ended up with 3

There’s nothing special about a Spectrum-friendly PSU, aside from the (now) unusual center-negative plug arrangement. Any decent switch-mode (regulated) PSU will do. I use a fairly generic Mean Well PSU for my Toast Rack, for example. I simply opened it up and swapped the two conductors around (it w...
by Ast A. Moore
Tue Apr 16, 2019 7:29 pm
Forum: Hardware
Topic: Like a buss I wanted a Spectrum and ended up with 3
Replies: 12
Views: 208

Re: Like a buss I wanted a Spectrum and ended up with 3

A 48K will be quite happy with a +2 power supply. No modifications are required. A 2A or more power rating is recommended.