-
Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…
... the address bus connections is floating (unconnected), but when the request ... -
What to do when INT doesn't work?Due to the limitations of the Spectrum's floating point number format, two slightly different large numbers, or two slightly different small fraction…
... limitations of the Spectrum's floating point number format, two slightly ... -
Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…
... between. These functions sit underneath floating point libraries, general integer / long ... -
GEDit syntax highlighting for Boriel's ZX BasicHi! I just tailored this syntax highlighting code and would like to share with he community. Suggestions are always welcome, though the file works w…
Hi!
I just tailored this syntax highlighting code and would like to share with he community. Suggestions are always welcome, though the file works working very well for me at the moment. Thanks to Boriel for the excellent tool!
... -
Port $28FF. Why 28?Testing floating bus behaviour for ZXUno, I've found that both Cobra and Arkanoid use this specific 16-bit port: $28FF. What is so special about putt…
Testing floating bus behaviour for ZXUno, I've found that both Cobra and Arkanoid use this specific 16-bit port: $28FF. What is so special about putting the value $28 in A15-A8 during a read to $FF?
Thank you very much in advance! :) -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... the screen bytes. Obviously the floating bus can't be used ... -
Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... ;Display small portions of multicolour either side for player lives ... vectors to enable/disable multicolour, control scanning, etc.
;Main multicolour interrupt
;--------------------------
multicolour_interrupt_A< ... -
TAPlist - the emulator versionI've got this working reasonably well; there's just a couple of small extra features which I want to add. (Recall that TAPlist writes a formatted lis…
... /> [*]Fix any indentation glitches.
[*]Floating right margin, to wrap at ... -
So our Spectrums are faster than modern computers at some things...According to John Carmack, anyway: [url]https://twitter.com/id_aa_carmack/status/193480622533120001[/url] who said: [quote="John Carmack"] I can se…
... special timing tricks such as multicolour), and a pixel can be ... -
Python script to scrape Amazon.com book reviewsI've been meaning to read the Gollancz Fantasy Masterworks (roughly 40 books) and Sci-Fi Masterworks (roughly 100+ books) lists for a while now, but …
... Think Jack Williamson (112)
Floating Worlds Cecelia Holland (112)
Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... the palette-switching and Timex-multicolour functions from the ULA+ specification ... (by stacking devices) or two multicolour screens mapped across the ROM ..."How I Would Have Ended BioShock" - a brilliant read for Bioshock fansIf you played (and liked) the first Bioshock game, then you MUST read this: [url]http://www.pentadact.com/2009-04-15-ending-bioshock/[/url] it's on…
... third is set in a floating city above the clouds. All ...Issue 3 expansion connector problemI am having problems with an issue 3 Spectrum, that otherwise works fine, but does not recognize either the Interface 1 or DivMMC/Enjoy (which are bo…
... that no connector pins are floating expect the unused ones. I ...Raspberry pi buyer adviceSo I'm considering buying a pi for Xmas, can someone point me towards a decent bundle, one with a wireless keyboard as I'm going to plug it into my T…
... some add kits that are floating around.
The vast ...Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... , as is the NMI and floating bus. The ROM checksum is ...All New Mega Speccy Mix-Up Quiz!I was a bit bored so I thought I'd do another one of these quizzes. In the piccy below there are [B]20 speccy games graphic fragments[/B] from in-ga…
... /grass (bottom left) - Gryzor
Floating door - Spike
Axe - Savage ...Edge Grinder, how would YOU do it?I always meant to post about this and AndyC reminded me in the 'vs' thread in games. [QUOTE=AndyC;808887]The thing I love about threads like this is…
... about R-Type!
Multicolour is out surely, the frame ...Using an EPROM in a 48K SpectrumThere are plenty of guides as to how to do this floating around, however I didn't like the fact that you can't then plug in the standard 27128 ROM ch…
... to how to do this floating around, however I didn't ...Just some graphics...I've had these projects floating around in TommyGun for a few months now. I've gone back, tweaked em, messed around with some bits, animated a fair …
I've had these projects floating around in TommyGun for a ...Yars Revenge ZX[B]YARS REVENGE ZX[/B] is ready to be loaded in your ZX Spectrum 48K! It's an [B]Arcade Game Designer[/B] release, don't expect a big game, it's rea…
... [B]Luca Bordoni[/B]
- Multicolour energy field by [B]Paul ...SpecBAS 0.844 releasedHi all - it's been a while... Having some unexpected extra time off work, I've been able to get some work done on SpecBAS and it's now a bit more …
... correctly before launching
Erroneous "Floating Point Error" crashes turned out ...Hardware damage due to software?<p>I'm not afraid to ask a stupid question, and I find it incredibly easy to do so in the hardware forum!</p><p>Is it possible to damage your Spectru…
... ?For example can you imagine multicolour games stressing ones Spectrum? Every ...Tau Day<br>By popular demand (well, demand of one, which is highly popular in the sorts of things I do :D ), here is a small celebration of tau day, June 28…
... using Math48, a 48-bit floating point package written by Anders ... -in using Steven Vicker's floating point implementation:
10 ...ZX-Assembler version 0.8 (beta) releasedDear readers, yesterday I've published ZX-Assembler in its first version 0.8. It offers you some interesting features, even if I know there are …
... and CASE. Also, using
floating point numbers is no problem ...TV Pal, odd and even framesI have been researching, but haven't found any real interesting information on this subject, so far. What I mean is, since TV PAL signal is interl…
[NEW] Retro Virtual Machine v1.0.0 for OSX released!!!!Here it is! Retro Virtual Machine v1.0.0 RELEASED!!!! Many thanks first to Patrik Rak for the PZX format and for their Z80 tests without which RVM…
... % accurate).
Emulation of the ‘floating bus’
Emulation of the ...Benchmarks It always shows up once in a while: benchmarks. http://www.z88dk.org/wiki/doku.php?id=temp:front#dhrystone_2.1 This small group includes Dhryst…
... programs) and the latter measures floating point performance.
I ...Are there any 'REAL' global conspiracies?Me and the missus have been watching the new X-Files series and also watching the old series from Episode 1. After watching last nights episode, the…
... years of Internet and eMails floating about now it seems impossible ...Spacewalk video looks fake Ha look at this space walk https://www.youtube.com/watch?v=IdKOOjPOy-g Watch the video for one minute At 4 hrs 11 minutes you see the grey t…
... same direction because it is floating.
The astronaut even ...Nirvana+ - Which games would you reproduce?Which games would you reproduce using Nirvana+ Early single screen or non-scrolling arcade games that could utilise the Nirvana+ engine for enhanc…
... Nirvana+ engine for enhanced full multicolour graphics.
- Super Breakout ...
