Search found 809 matches
- 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 ...
- 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
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.
- 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...
- 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
updated the code and it actually works - although the bits may still be reversed from what you would normally expect.
- 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
Tss...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.
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
- 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...
- Mon Jan 01, 2024 5:26 pm
- Forum: ZXDB Fixes
- Topic: Treasure Island (Mr. Micro) credits might be wrong
- Replies: 15
- Views: 390
- 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.
- 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 ...
- 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
- 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...
- 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
1.7 Trantor
1.10 Auf Wiedersehen Monty
- 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!
1.3 Overlander
1.4 El Loco - not Spellbound!
- 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
2. Quazatron
3. Ironman
- 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...
- Mon Dec 18, 2023 11:29 am
- Forum: Games/Software
- Topic: Speccy golf - a good computer spoiled
- Replies: 35
- Views: 1214
- 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.
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
- Tue Dec 12, 2023 11:14 pm
- Forum: Games/Software
- Topic: Show It! (forum game)
- Replies: 339
- Views: 7754
- Tue Dec 12, 2023 4:59 pm
- Forum: Games/Software
- Topic: Show It! (forum game)
- Replies: 339
- Views: 7754
- Mon Dec 11, 2023 10:03 pm
- Forum: Games/Software
- Topic: Show It! (forum game)
- Replies: 339
- Views: 7754
- 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.
- 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
2. TLL
3. Highway Encounter
- Fri Dec 08, 2023 4:20 pm
- Forum: Games/Software
- Topic: Show It! (forum game)
- Replies: 339
- Views: 7754
- Fri Dec 08, 2023 10:10 am
- Forum: Sinclair Miscellaneous
- Topic: Friday Quiz: SCRambled 5
- Replies: 41
- Views: 501
- Fri Dec 08, 2023 10:09 am
- Forum: Sinclair Miscellaneous
- Topic: Friday Quiz: SCRambled 5
- Replies: 41
- Views: 501