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Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... simplified memory contention scheme - afaik all memory was contended, anytime (so every memory access ... (some utilising Z80s) suffered less contention, but this led to significant ... (and even 16K) of video memory (even split into several bitplanes ... -
Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…
... ULA didn't apply enough contention to IO instructions, which ... to use the more conservative memory contention model instead of the ... intended IO contention model by forcing the memory lines to ... instead of the intended IO contention model, and so the ... -
So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…
... while not the published of memory contention models it has better ROM ... /> 2x 128k +2 (need repairs memory / power)
1x Spectrum 128k ... -
Upgrading the Humble Spectrum 128 +2 (Grey)Hello there my fellow WoS'ers I am at a subtle in-pass in my wants for one of my +2 motherboards. I received this mobo, DOA in a job lot from fleab…
[B]The ability to switch memory contention modes[/B]
I' ... -
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…
... (and they have no low memory contention).
This screws up ... -
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…
... 1 all the time then contention isn't happed. I tested ... IO contention because A14 and A15 are ... . It shouldn't be a memory contention.
I forgot to ... contended pulses are missing. The contention period start at the third ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... don't replicates the Spectrum memory contention model.
Emulate the ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
Yes, I read about memory contention, but I didn't even ... -
SAM emulators and save states ...Hi Is there now, or has there even been, a SAM emulator that can save/ load states? Moose
... it was still missing proper memory contention, which will break some video ... -
BETA-DISC (TR-DOS) support in ZX emulatorsBETADISC 128 is original device designed for external use with ZX Spectrum 128/+2(grey). Russians ZX clones (Pentagon, Scorpion, ZX profi, Quorum, ZX…
... all ZX models is incompatible, memory contention on all ZX models is ... -
Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... document used to add proper memory contention support to SimCoupe :)
Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
... explained in detail in the memory contention chapter....
CheersNew interface for ZXThis is my old (2004) unfinished project of internal interface for ZX Spectrum 128+2: ([url]http://velesoft.speccy.cz/hardware_in_development.htm[/u…
... pentagon has no memory contention, is this interface removes contention of +2? will ...New interface for ZXThis is my old (2004) unfinished project of internal interface for ZX Spectrum 128+2: ([url]http://velesoft.speccy.cz/hardware_in_development.htm[/u…
... pentagon has no memory contention, is this interface removes contention of +2? will ... of ram onboard so removes memory contentionNew interface for ZXThis is my old (2004) unfinished project of internal interface for ZX Spectrum 128+2: ([url]http://velesoft.speccy.cz/hardware_in_development.htm[/u…
... pentagon has no memory contention, is this interface removes contention of +2? will ... can be used original memory and ports contention as on ZX128, or ... active FAST PORTS/MEMORY for better ...Commodore 64 - First time trying - REVIEW & Pictures!Right, so the 2nd hand shop was selling this Commodore and accessories. So I decided to buy it, as I've never had a Commodore and this is my first ti…
... cycles so there's no memory contention at all. In contrast, the ...New project: CargandoLeches. Ultraloads with ROMHi This project has started months ago, between decicoder, macleod and me. Uses the best modulation of k7zx (throwing shavings). But this ultraloa…
... , thus SAVEing from a contended memory zone will make samples vary ... going to be written into memory, contention may apply. The LOAD routine ...New project: CargandoLeches. Ultraloads with ROMHi This project has started months ago, between decicoder, macleod and me. Uses the best modulation of k7zx (throwing shavings). But this ultraloa…
... , thus SAVEing from a contended memory zone will make samples vary ... going to be written into memory, contention may apply. The LOAD routine ...SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…
... 3.5MHz Z80 core with memory contention and other artifacts can be ...Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…
... know EightyOne doesn?t emulate memory contention properly, so I doubt it ...Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…
... emulators have correct timing for memory contention but wrong timing for border ... only (or vice-versa), thus memory access would behave according to ...Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…
... emulators have correct timing for memory contention but wrong timing for border ... only (or vice-versa), thus memory access would behave according to ...Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…
... so it's already in contention. Successive lines line up too ... with the line-by line memory contention. The problem has always been ... two lines in succession, in contention, it's fallen into synch ... with the contention so there are no early ...BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…
... /> AFAIK Pentagon doesn't have memory contention so I doubt the same ...BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…
... ]AFAIK Pentagon doesn't have memory contention so I doubt the same ...Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... TK90X timing:
[LIST]
[*] Memory contention is identical to Spectrum 128K ... the TK90X. BIFROST* relies on memory contention to synchronize interrupts with the ... render loop also depends on memory contention to keep everything synchronized. Although ...Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... "), it means there's no memory contention afecting this operation, thus the ... main screen access regardless of contention.
Moreover, the difference ... 5602T, so it matches the memory contention timing reported earlier (as expected ...Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... /> SpecEmu is correctly emulating that memory contention and main video updates in ...SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... match the +2a/b/3 memory contention and hopefully spectrum se rom ...Games that could be better off with a 7MHz CPUI've just reviewed Kung Fu Master for the Spectrum, as I remember it as a very poor conversion from the arcade. Then it just ocurred to me to raise t…
... (speccy screen mode) had extra memory contention to cripple the processor to ...
