Search found 809 matches

by Stefan
Thu Jan 04, 2024 10:10 pm
Forum: Programming
Topic: How long can an interrupt be blocked?
Replies: 12
Views: 497

Re: How long can an interrupt be blocked?

You know, I might have come across something like that while searching for the answer to this question, but I wouldn't have understood what it meant in practical terms. I'm just not really a hardware person. :lol: Same here. I have always had the bliss of not having to think about /what/ generates ...
by Stefan
Thu Jan 04, 2024 9:56 pm
Forum: Programming
Topic: How long can an interrupt be blocked?
Replies: 12
Views: 497

Re: How long can an interrupt be blocked?

Found a more explicit reference to a source:

https://mametesters.org/view.php?id=5924&nbn=1
According to p. 226 of Chris Smith's excellent book "The ZX Spectrum ULA : How to design a microcomputer" the ULA pulls the /INT pin low for exactly 32 T-states.
by Stefan
Thu Jan 04, 2024 9:19 pm
Forum: Programming
Topic: How long can an interrupt be blocked?
Replies: 12
Views: 497

Re: How long can an interrupt be blocked?

I’m reading 32T at http://www.zxdesign.info/interrupts.shtml A Z80 interrupt must not be held active for longer than is necessary as this may lead to the Z80 responding to it multiple times. It is documented somewhere that the ZX Spectrum holds the interrupt active for 32 T-states, which is long eno...
by Stefan
Thu Jan 04, 2024 2:58 pm
Forum: Programming
Topic: ZX Basic & reading two keys at the same time
Replies: 21
Views: 561

Re: ZX Basic & reading two keys at the same time

MustardTiger wrote: Thu Jan 04, 2024 2:57 pm amazing :lol:
:D updated the code and it actually works - although the bits may still be reversed from what you would normally expect.
by Stefan
Thu Jan 04, 2024 2:52 pm
Forum: Programming
Topic: ZX Basic & reading two keys at the same time
Replies: 21
Views: 561

Re: ZX Basic & reading two keys at the same time

MustardTiger wrote: Thu Jan 04, 2024 1:49 pm Using IN() can get a row of keys but there's no boolean logic to extract the bits.
Tss...

Code: Select all

10 poke 16384,in(254):for b=0 to 7:print at b,1;b;" ";point(b,175):next b:goto 10
by Stefan
Wed Jan 03, 2024 11:48 pm
Forum: Music
Topic: Blasphemy! Your favourite C64 SID chiptunes...
Replies: 14
Views: 845

Re: Blasphemy! Your favourite C64 SID chiptunes...

One of my favorite SID tunes from the demo scene: https://www.youtube.com/watch?v=DSFI7MsB3Zk I was going to say that this is less blasphemous since composer Geir Tjelta has also created demos for the Speccy. But I confused him with Darklite's Neon who's real name is also Geir, just with a different...
by Stefan
Mon Jan 01, 2024 5:26 pm
Forum: ZXDB Fixes
Topic: Treasure Island (Mr. Micro) credits might be wrong
Replies: 15
Views: 390

Re: Treasure Island (Mr. Micro) credits might be wrong

druellan wrote: Mon Jan 01, 2024 5:08 pm Oh, we posted the same thing at the same time. Yep, but I want another source, if we can find it.
I completely agree, the cpc entry has no source reference that I can find, not being able to search their forums does not help.
by Stefan
Mon Jan 01, 2024 5:01 pm
Forum: ZXDB Fixes
Topic: Treasure Island (Mr. Micro) credits might be wrong
Replies: 15
Views: 390

Re: Treasure Island (Mr. Micro) credits might be wrong

oh... but the cpc folks have already figured ISSI out as being John Boy.
by Stefan
Mon Jan 01, 2024 4:41 pm
Forum: ZXDB Fixes
Topic: Treasure Island (Mr. Micro) credits might be wrong
Replies: 15
Views: 390

Re: Treasure Island (Mr. Micro) credits might be wrong

ISSI is ISSI… see foreword in https://www.andreaszapf.de/media/CPC/Sensational_Games_for_the_Amstrad_CPC464.pdf Since you have read this far I hope that we can count on your support for game playing! Remember to speak out in favour of fun whenever you can. If people say that game playing is a waste ...
by Stefan
Mon Jan 01, 2024 4:22 pm
Forum: ZXDB Fixes
Topic: Treasure Island (Mr. Micro) credits might be wrong
Replies: 15
Views: 390

Re: Treasure Island (Mr. Micro) credits might be wrong

There’s a Jim Sheehan owning up for creating and coding the Vic 20 version https://www.mocagh.org/loadpage.php?get ... iousisland
by Stefan
Mon Jan 01, 2024 4:11 pm
Forum: ZXDB Fixes
Topic: Treasure Island (Mr. Micro) credits might be wrong
Replies: 15
Views: 390

Re: Treasure Island (Mr. Micro) credits might be wrong

How about Jim Gregory (the founder) using nickname ISSI. The letters are stylized like rock band KISS and in the interview https://archive.org/stream/home-computing-weekly-028/Home_Computing_Weekly_028#page/n37/mode/1up with him in Home Computing Weekly (linked on Mr Micro page) he started with elec...
by Stefan
Fri Dec 22, 2023 2:15 pm
Forum: Sinclair Miscellaneous
Topic: Friday Quiz: Christmas MegaQuiz 2023
Replies: 124
Views: 2440

Re: Friday Quiz: Christmas MegaQuiz 2023

1.5 Cybernoid
1.7 Trantor
1.10 Auf Wiedersehen Monty
by Stefan
Fri Dec 22, 2023 2:10 pm
Forum: Sinclair Miscellaneous
Topic: Friday Quiz: Christmas MegaQuiz 2023
Replies: 124
Views: 2440

Re: Friday Quiz: Christmas MegaQuiz 2023

1.1 Ghouls 'n' Ghosts
1.3 Overlander
1.4 El Loco - not Spellbound!
by Stefan
Tue Dec 19, 2023 5:11 am
Forum: Games/Software
Topic: Devfinitive Edition (Steve Turner): vote
Replies: 14
Views: 664

Re: Devfinitive Edition (Steve Turner): vote

1. Dragontorc
2. Quazatron
3. Ironman
by Stefan
Mon Dec 18, 2023 9:17 pm
Forum: Games/Software
Topic: Zaxxon, should have been better for 1985
Replies: 24
Views: 1066

Re: Zaxxon, should have been better for 1985

It was only recently that I began to appreciate the difficulties of cross-development back then when the developer might be presented with the finished game on a different platform and no source code and asked to replicate it in a short space of time. I think it was an article about Elite I was rea...
by Stefan
Mon Dec 18, 2023 11:29 am
Forum: Games/Software
Topic: Speccy golf - a good computer spoiled
Replies: 35
Views: 1214

Re: Speccy golf - a good computer spoiled

StanVanman wrote: Mon Dec 18, 2023 10:34 am Of what? The picture doesn't work.
Image
by Stefan
Fri Dec 15, 2023 12:52 pm
Forum: ZXDB Fixes
Topic: Killer Kong screenshot
Replies: 6
Views: 318

Re: Killer Kong screenshot

There are four main file downloads:
1. tzx - blaby different
2. tap - blaby
3. tzx - blaby
4. tzx - prism

1, 2 and 4 seem identical, but the Kong sprite on tzx #3 matches the screen shot and also the map.
✓ Reviewed
by Stefan
Tue Dec 12, 2023 11:14 pm
Forum: Games/Software
Topic: Show It! (forum game)
Replies: 339
Views: 7754

Re: Show It! (forum game)

TMD2003 wrote: Tue Dec 12, 2023 12:04 am
Spoiler
Hocus Focus.
Image

Since Lee is making up correct spelling rules as we go along, I proudly present:

Big Nose's American Adventure

... just waiting for the "no abbreviations" rule to be thrown at me :lol:
by Stefan
Tue Dec 12, 2023 4:59 pm
Forum: Games/Software
Topic: Show It! (forum game)
Replies: 339
Views: 7754

Re: Show It! (forum game)

TMD2003 wrote: Tue Dec 12, 2023 12:04 am
Spoiler
Hocus Focus.
"Well... get out of this one, smeg head!"
- The Inquisitorrrrrrrr
I'll take those double points thank you very much:

Image

How to be a Complete Bas**rd
by Stefan
Mon Dec 11, 2023 10:03 pm
Forum: Games/Software
Topic: Show It! (forum game)
Replies: 339
Views: 7754

Re: Show It! (forum game)

Lee Bee wrote: Sat Dec 09, 2023 12:28 am
Spoiler
Star Trek
Image

The Addams Family
by Stefan
Mon Dec 11, 2023 3:56 pm
Forum: Games/Software
Topic: Devfinitive Edition (Steve Turner): discussion
Replies: 6
Views: 302

Re: Devfinitive Edition (Steve Turner): discussion

Mr T only did the music for Zynaps.
by Stefan
Mon Dec 11, 2023 3:45 pm
Forum: Games/Software
Topic: Devfinitive Edition (Costa Panayi): vote
Replies: 26
Views: 919

Re: Devfinitive Edition (Costa Panayi): vote

1. Cyclone
2. TLL
3. Highway Encounter
by Stefan
Fri Dec 08, 2023 4:20 pm
Forum: Games/Software
Topic: Show It! (forum game)
Replies: 339
Views: 7754

Re: Show It! (forum game)

Prophyt wrote: Fri Dec 08, 2023 4:14 pm
Spoiler
Moontorc
Image

Thanatos
by Stefan
Fri Dec 08, 2023 10:10 am
Forum: Sinclair Miscellaneous
Topic: Friday Quiz: SCRambled 5
Replies: 41
Views: 501

Re: Friday Quiz: SCRambled 5

R-Tape wrote: Fri Dec 08, 2023 10:08 am20 - H.A.T.E
grrr... note to self: stop adding hyperlinks when time is of the essence
by Stefan
Fri Dec 08, 2023 10:09 am
Forum: Sinclair Miscellaneous
Topic: Friday Quiz: SCRambled 5
Replies: 41
Views: 501

Re: Friday Quiz: SCRambled 5

20. H.A.T.E. ?