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Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…
... the Spectrum and have it work too because the bus being "fouled ... not something 'fouling' the bus - check for bus lines that are stuck ... /> If the Z80 is working and the bus is not fouled, you ... stop the CPU clock when contention occurs). That will probably be ... -
Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…
... the Spectrum and have it work too because the bus being "fouled ... not something 'fouling' the bus - check for bus lines that are stuck ... /> If the Z80 is working and the bus is not fouled, you ... stop the CPU clock when contention occurs). That will probably be ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... would crash if the contention is not right, at ... difference between the emulators and Harlequin is not enough ... correctly on the first contention and the rest is ... -state discrepancy between ulatest3 and the wiki?[/QUOTE]
bus when sensing the ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... wiki and ulatest3 (and thus what I'm saying about the actual timing ... of the contention and byte fetches).
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... which runs in uncontended memory and an uses an uncontended port ... test anything to do with contention.[/QUOTE]
Two ... time:
a) 1T state timing difference (original thread).
... an IO instruction that experience contention, and when that is.Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... Chris pointed out, the IO contention and Memory contention differ. So the question ... second cycle contended due IO contention and the #7FFF gets all cycles ... applies memory contention when it sees #40xx-#7Fxx on the bus, and in ...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... Chris pointed out, the IO contention and Memory contention differ. So the question ... the memory contention pattern and the other one due IO contention pattern?[/QUOTE ... bus, or A0 [I]and[/I] ~IOREQ are low.
The contention ...Kempston on real machines and on emulatorsRecently I've tested several 48K games on my Spectrum +2A with Kempston interface. The computer resets when I start the game. I've tried with two dif…
[QUOTE=Philip Kendall;215801]Floating bus (vague apologies for the short ... subforum talking about floating bus. If I had more hardware and programming knowledges ...Kempston on real machines and on emulatorsRecently I've tested several 48K games on my Spectrum +2A with Kempston interface. The computer resets when I start the game. I've tried with two dif…
... 't matter too much... the floating bus is a slightly strange side ... some games (notably Arkanoid, Cobra and Sidewize) to display their sprites ...Kempston on real machines and on emulatorsRecently I've tested several 48K games on my Spectrum +2A with Kempston interface. The computer resets when I start the game. I've tried with two dif…
... timings between the 48K and 128K. Removing the floating bus broke what? 3 ...Arkanoid and +2A, problems??Is there any kind of incompatibility with Arkanoid in a +2A? I load the game but when it's time to play, the stick doesn't move and nothing happens, …
... doesn't move and nothing happens, and I have tried ... Arkanoid requires the standard spectrum "floating bus" behaviour that the +2A ... common problem with bat and ball games. Ricochet is ... br /> (In some cases, the floating bus check code can be replaced ...Group Order of Internal/External Kempston Turbo InterfacesI have contact Velesoft ([url]http://velesoft.speccy.cz/kmturbo-cz.htm[/url]) about the production of internal or external kempston turbo interfaces …
... enable mouse move speed switching and to CPLD is impossible add ... 800 and more.
As new features i can add:
-floating bus ... stabilisation ( return interrupt vector #FF to data-bus )
-fuller ...Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …
... /> Contended IN... failed (0xff)
Floating bus... skipped (B=0x01)
Contended ... failed (0x01)
High port contention 1... passed
High port ... /> Floating bus... failed (0xff)
Contended memory... failed (0x02)
High port contention ...Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …
...
Floating bus... passed
Contended memory... passed
High port contention 1 ... ... passed
High port contention 2... passedQuick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…
... difference between the 128K / +2 and the +2A / +3.
floating bus....failed(0x02)
High port ... in...failed (0xfd)
floating bus....skipped (b=0x01)
... contened in...passed
floating bus....skipped (b=0x01)
...+2A, are they all this incompatible?My +2A does not seem to be faulty but the number of games that don't run on it are silly. Scooby Doo(Elite), Crazy Cars , Turbo Outrun, Vindicator(im…
... issue with some games (no floating bus) and sometimes a ROM issue. In ... interrupt vector to go astray and is easily fixed with the ...CF to IDE adapterthese things say that they allow a CF card to appear to a computer as an IDE device, at the hardware level. I'm just curious, would a CF card connec…
... power consumption, but incompability with bus timing. I had problems with 128MB ... simple IF. Examples are Divide and mine simple CF adapter (practically ... /zxcf.htm[/url]
And it is 90% hot pluggable ...Detecting a Kempton joystick...I've been playing with the idea in the games I'm currently developing so that once the Kempston joystick has been selected you can hold FIRE down to …
... , sounds like you're seeing floating bus values there. Quoth the [url ... port address is between 0x40 and 0x7f), but nothing will put ... a mixture of 0xff (idle bus), and screen and ATTR data bytes. This ...Detecting a Kempton joystick...I've been playing with the idea in the games I'm currently developing so that once the Kempston joystick has been selected you can hold FIRE down to …
... actually a floating bus if the ULA is pulling screen and attr data ... but then considered that a floating bus would produce "random 0 to ...Detecting a Kempton joystick...I've been playing with the idea in the games I'm currently developing so that once the Kempston joystick has been selected you can hold FIRE down to …
... whatever fire you press first, and allows switching between the controls ... unless you're using the floating bus do do vsync). Matthew Smith ... /> [code]
; caveat - ints enabled and ISR is short enough for ...Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…
... /wiki/Unit_test"]unit tests[/URL] and can't be run in ... .tap file, that when loaded and ran (be it on a ... instruction, flag, memory location (and maybe contention and timing too, if possible), without having ...Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…
... .tap file, that when loaded and ran (be it on a ... instruction, flag, memory location (and maybe contention and timing too, if possible), without having ... run on real/emulated speccys and check everything.
Complex ...MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…
... need detect K-MOUSE interface and if is connect then you ... disable read 7FFD, register A=floating bus data
- set flag Z ...list of ZX games with raining effect(ula snow)If you know any ZX games with raining effect in screen, then add game name to list. I know about this games only: (tested on real ZX128+2 - grey) 4x…
... problem in CEZGS's Columns, and after fixing it I had ... secondary effects related to the floating bus effect on Kempston joystick reading ...PDA and emulationWotcha folks. I've been running PalmZX on my Palm Treo for around 3 years now and like it immensely. What I am wondering is, is there a PDA/phone o…
... Good news. SpectrumAnyWhere works and I can open for exmaple ... press SPEED on virtual keyboard and game is loading. Arkanoid is ... - game screen is shown and nothing more happens. So I ... emulation of the Spectrum's 'floating bus'. Sounds like SpectrumAnywhere doesn' ...PDA and emulationWotcha folks. I've been running PalmZX on my Palm Treo for around 3 years now and like it immensely. What I am wondering is, is there a PDA/phone o…
... emulation of the Spectrum's 'floating bus'. Sounds like SpectrumAnywhere doesn't ... idea. I tried: Colossus Chess and Robocop work very well. :wink ...Group Order of Internal/External Kempston Turbo InterfacesI have contact Velesoft ([url]http://velesoft.speccy.cz/kmturbo-cz.htm[/url]) about the production of internal or external kempston turbo interfaces …
... RIGHT button - swap LEFT and RIGHT mouse buttons
...
If switch "EXTRA" and "EN31" is off = SLAVE ... fixed vector table adress (correct floating bus value):
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...Blizzard's Rift in Spinanyone else having trouble playing blizzard's rift in spin, the game loads ok, you can select controls, select a system to visit but when you select …
... and the +3 - not least of which is the totally different floating bus ...Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... ?id=0004400]The Sentinel[/url] and [url=http://www.worldofspectrum.org ... .cgi?id=0004494]Sidewize[/url]: floating bus
[/list]
After that ...Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... /> Indeed, this is the "Floating bus" issue mentioned by Phillip.
floating bus" instead.
floating bus" method of screen synchronisation ... not have this floating bus behaviour, and therefore these games ...
