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zxs v0.2 releasedI have released v0.2 of zxs if anyone is interested, judging by the response to the first release, I'd say not, but I'm gonna do it anyway!. It has h…
... an issue with the timing of display updates. ... that's resolved, and anything that uses multicolour ... later in development. The timing is very much a ... and one without for FREERUN. Once that is fully implemented, timing ... need to emulate the floating bus to prevent a ... -
What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3
... being written for the page contention of the +2A rather than ... the +2A has the page contention that Sinclair *said* the original ... don't fix the page contention issue. They're also pretty ... with games that read the floating bus, and hardware that requires ROMCS on ... -
Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... 48K Spectrum, 128K Spectrum, Pentagon and Scorpion, so here's what ... /> Floating bus? failed (0x00)
Contended memory? failed (0x02)
High port contention ... port contention 2? skipped (B=0x01)[/code]
And running Woody ... -
Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…
... br />
+2A timings
Floating bus support (needed for things like ...
no I/O contention (can run many Pentagon demos ... than choosing between the 48K and 128K manually...[/QUOTE]
... accessing RAM paging ports). And there is also the potential ... -
128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…
... fusetest differentiate between machines through timing?[/quote]
It ...
[code];; Distinguish between 128K and +3 by looking at the ... br />
The 0x7ffd and 0x3ffd tests are testing that ... on the +3 (and that the floating bus value is read on ... -
What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... 583148]Working out the interrupt timing will be fun. It looks ... which signals this ULA generates and what pins they use.< ... known to work?[/QUOTE]
FLoating bus cannot work as there's ... separate memory banks for contended and uncontended memory. IN 255 always ... -
Kralizec, a MSX development group, publishes "MajiKazo" for ZX Spectrum[youtube]wJI30FyT7Qw[/youtube] It's a port from a MSX game called [URL="http://www.generation-msx.nl/msxdb/softwareinfo/3449"]MajiKazo[/URL] release…
... the difference between Side 1 and 2?[/QUOTE]
... uses the floating bus effect to synchronize with the screen raster and therefore ... Since +3 and +2A models don't have the bus effect, I ... with all models, carefully timing all the ingame routines so ... -
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... "fusetest" on a real TK90X, and obtained the following results:
Floating bus... failed (0x38)
Contended memory... failed (0x7f)
High port contention ... . Unfortunately they also show that "contention" and "iocontention" from fusetest didn't ... -
Fusetest port 0x7FFD test resultsHi, I'm adding the Spectrum 128K emulation to my FPGA core running on the V6Z80p platform. I'm doing some tests; running Fusetest, the machine is se…
... paging register, probably from the floating bus.[/QUOTE]
OK! Finally ... rises some doubts about the timing of the emulator.
and I update the bit 5 ... -
48K/128K classificationI'm sorry if I've looked in the wrong places and not found it, but what are the rules regarding a game being listed as either: ZX Spectrum 48K ZX Sp…
... -English ROMs)
* requires the floating bus (original release of Arkanoid)
* requires original 128 contention (this only seems to affect ... it still needs 48 mode) and the only issue you might ... -
Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…
... 'floating bus' emulation. %-)
ZXodus seems to work ok.
and ... CHEV and 2012 are trembling terribly. dunno if it is timing (but ... just took those i remember, and BorderTrix seems to be the ... -
Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…
... of problems with it) for 'floating bus' emulation. %-)[/quote]
[quote]and BorderTrix [b]seems[/b] to ... CHEV and 2012 are trembling terribly. dunno if it is timing ... late timing Speccy'. They all start with standard timings and drift ... -
FBZX Wii ReleasedJust tried this out on my Wii and it seems pretty good. 128K AY sound not very good but the emulator is highly configurable. Not bad for a first rele…
... /> - Added precision emulation setting (floating bus, contention, interrupt timing)
- Added NTSC 48K machine ... -
"The Amazing Rocketeer", compatible with real hardware?I've managed to create a physical copy for myself of [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0017643"]this game by John Fotou[/URL] bu…
... requires the floating bus it will only work on A and B. If ... it requires broken 128 contention it will ... If it requires fixed 128 contention it will work on B ... will only work on A and B. If it requires ... it will work on C and D, and maybe on B.
ULA bug and snowI am tryng to improve the snow emulation in FBZX wii but I do not have a real spectrum to test the results. I used the information taken from Harele…
... in the floating bus. If register I is between 0x40 and x7F the ... the pair bytes (both attribute and display):
1) The ... RAS cycle is suppressed for contention with the refresh, the ULA ... wii does not emulate IR contention, so these results should be ...WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... ") but with proper PAL syncs. Floating bus and "ULA snow" is present as ... )
FUSETEST reports a contention offset of 9 instead of ... me that I have a contention of 6 clocks (this is ... ) at 0x3800. Spectaculator shows me contention at one cycle before
TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…
... ]
[*] The contention pattern.
[*] Whether spurious contention is applied as ... ones.
[*] The timing of the first pixel read ... IN from an unattached port ('floating bus').
[*] Details on ... knowledge than me about timing stuff in TK90X.
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... significant change over moving the timing of the second pair fetch ... altering the timing in the ULA+ to reduce IO contention, it ... chips, after startup, with zero contention - and it's a real spectrum ... nonsense!) this non-trivial bus handling alone took most of ...30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
Good idea - I've never used the floating bus myself. There'd still be a fair bit of variability in the results of that as a test, but using that and say, the first 8 lines of contention you should easily have everything lined up exactly.Emulating a +2A with floating bus modBefore I start hacking Fuse's source... Does any existing emulator have an option to behave as a +2A with the [URL="http://www.secarica.ro/html/plus…
... .ro/html/plus3_hardware.html#inFFport"]floating bus modification[/URL]?
-Stephen ... "]128Ke[/url] which has +3 contention and a floating bus.Emulating a +2A with floating bus modBefore I start hacking Fuse's source... Does any existing emulator have an option to behave as a +2A with the [URL="http://www.secarica.ro/html/plus…
... "]128Ke[/url] which has +3 contention and a floating bus.[/QUOTE]
Thanks ...Timex 2068 hi-color / hi-res modes.Hello. I know this is not a Timex forum but since it is a very close relative of the Speccy I thought I'd ask my question here. Does anyone know …
... ]In practice there were timing differences because the original ... with the same timings, and infact McLeod_IdeaFix has implemented the ... (so the floating-bus trick doesn't work). And then the timings ... before the screen blank and the interrupt frequency (60Hz ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... has reliable and exact info about Pentagon floating bus behavior and timing.[/QUOTE]
and ulatest3 tests from [URL=" ... [/URL] on Pentagon 128 and posts the results here?
and posts both for clarity ...X=Y=ZFirst public outing of X=Y=Z for the 48K Spectrum, a 4-level demo which can be download from: [as TZX] [URL="http://www.bobs-stuff.co.uk/extras/xyzd…
... "Issue 2 Keyboard" setting ticked and unticked -- it made no difference ... way. Some sort of subtle timing issue, or floating bus issue maybe?X=Y=ZFirst public outing of X=Y=Z for the 48K Spectrum, a 4-level demo which can be download from: [as TZX] [URL="http://www.bobs-stuff.co.uk/extras/xyzd…
... "Issue 2 Keyboard" setting ticked and unticked -- it made no difference ... . Some sort of subtle timing issue, or floating bus issue maybe?[/QUOTE]
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... Spectrum with no memory contention (similar to a ... clock). A rudimentary floating bus is implemented which allows ... works and lack of memory contention, border and multicolour ... effects don't work on ZX Prism. Memory contention ...Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …
... would work regardless of the floating bus and the peripherals attached?
contention requires getting floating bus emulation right first. For ... undocumented CPU flags including MEMPTR and SCF/CCF working right first ...Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …
... would work regardless of the floating bus and the peripherals attached?
... is supposed to test contention requires getting floating bus emulation right first. ... CPU flags including MEMPTR and SCF/CCF working right ... the IN's around and get the result from ...NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…
... display timing is different. The current crop of multicolour games and old ... depend on floating bus behaviour. They will sit in a loop and look ... -detection of attached Kempston interface and may auto-select Kempston on ...Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... be reliably replaced with timing routine with no flicker...< ... another game that uses the floating bus to synchronise the screen, ... Pentagon also does not exhibit floating bus behaviour, so this fix ... . It checks for the floating bus and if it does not exist ...
