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Contended memory and TritoneQuick question regarding contended memory...<div style="font-style: normal;"><br></div><div style="font-style: normal;">I'm testing ideas with Triton…
Quick question regarding contended memory...
I'm testing ideas ... code after 0x7fff memory address and the data in contended memory, and it ... being run from non contented memory, so I think it actually ... in all I have to test with but it is actually ... -
Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…
... be an issue with the contended memory not working as it should ... [/url]
I implemented contended memory simplistically but I'm wondering ... check if the access is contended and if so I slap ... an index.
My contended table is correct.
My ... -
Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…
... . I've been investigating contended memory timings on the Timex Sinclair ... Timex SCLD still applies memory contention at these locations ... the CPU is accessing contended video memory or "uncontended" ROM ... might as well call this "contended ROM".
... -
ZX Evolution -- contended memory and raster emulationFresh bleeding update for [url=http://www.nedopc.com/zxevo/zxevo_eng.php]ZX Evolution[/url] [url=https://code.google.com/p/pentevo/source/list]Baseco…
... -- raster and ULA contended memory emulation for original 48k and ... br />
2. Contended memory works only if you have ... : for some help with raster/contended memory
Mike ... very valuable insight into contended memory topic and useful discussions ... -
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…
It's the new contended memory test I wrote this afternoon that I'm interested in here (although the contended IO one may be interesting as well) :-) -
ULA TEST 3 results on real hardwareHi guys, I'm writing small spectrum emulator and I wanna implement precise emulation for different spectrum models :-) I found nice test for conten…
... />
I found nice test for contended memory - [URL="http://wizard.ae.krakow ... -
Quick question regarding contended memoryIf I've read the documentation correctly, the following applies: 128k/+3 "Memory banks 1,3,5 and 7 are contended" +2A/B/+3 "RAM banks 4, 5, 6 and 7…
...
"Memory banks 1,3,5 and 7 are contended"
contended."
That means, that ... -
How many T-states takes PUSH DE ?Hi. Just a quick one. According to z80.info docs, a PUSH DE should take 11 T-States to be executed. But WHAT if SP is pointing to Contended Memory,…
... if SP is pointing to Contended Memory, specially to the display file ... take longer ???
The test program is running with interrupts ... ULA must access the video memory to generate the pic.
Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…
... the +2A/+3 having different contended banks...
Anyway, I ...Memory Map/ContentionHi I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scrolling…
... this a correct map for memory contention?
Address Size ... bytes
5B00-7fff 08k Contended Memory
8000-FFFF 32k Fast ... Memory (well normal memory really :) )
Cheers ...IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…
... It's common use to test only for bit 7 to ... bus cycle that might affect contended memory, and the ULA stops ... is, IN 255 is not contended.
Here ... ], if you want to test other emulators, or real ... br /> [code] ;Rutina de test del puerto 255. (C)2009 ...Sinclairean A3[B]Sinclairean[/B], a new ZX Spectrum emulator written in machine code for x86-compatible, OpenGL-capable computers. Features: [LIST] [*]Fast machin…
... is used as stub
[*]Contended memory not emulated yet
[*]Floating ... is available
[/LIST]
Test keys:
[B]F1 ...+2A extended memory map & ULA bug?The [URL="http://www.worldofspectrum.org/faq/reference/128kreference.htm"]128K reference page[/URL] says: [quote]The ULA bug which causes snow when I…
... is set to point to contended memory still occurs, and also appears ... is set to point to contended memory.[/quote]
Will the ... mode, with RAM bank 4 (contended memory) in 0x0000-0x3FFF, and place ...LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... the detailed timings of contended RAM. It gives timings ... residing in, or reading/writing, contended RAM.
... LDIR instruction in non-contended memory, and the source (HL ... and destination (DE) addresses in contended memory.
Machine cycle ...Memory upgradeHi! I bought a 16K rubber key Spectrum. It's said in the box and memory test program also said it's 16K machine. Strange thing is that there is yell…
... said in the box and memory test program also said it's ... (so no soldering needed) for memory upgrade. There is also 4 ...contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct place
can it be altered on the toastrack and grey +2 to match the the +2a/b and +3?A 30th Anniversary ProjectHappy new year (belatedly...) So with the 30th anniversary approaching, I've decided to do a hardware project to celebrate it. Something hands-on (o…
... output gets halted every time contended memory is used (so isn't ... is fine (as is the memory, which won't be used ... />
Next I have to test out the CPLD design with ...Timing of Timex Computer 2068Is the timing of the Timex Computer 2068 fully documented yet? I have one here with the ZX Spectrum Emulator cartridge and have downloaded a few test…
... like the 6C001 ULAs. The contended memory timing seems to be the ... . I'm wondering how to test the contended I/O timing. Plenty ...48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... end.
Ran the memory test
PRINT PEEK 23732 + PEEK ...Spectrum +2a memoryHi all, Happy New Year. A quick question, I have a Spectrum +2a that I am seeing a very intermittent fault, once every 20 - 30 power ups. I plug…
... to fail the lower 16K memory test.
Does anyone know ...New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…
... /> I've read all about contended memory but as yet haven't ... one I have something to test against.
I would ...[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…
... knowledge base.
[b]Test it and please let me ... ’. The emulator pass all the test i have found.
‘Snow ... bus’
Emulation of the contended memory timings.
Pixel to pixel ...No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…
... magic wand to remove the memory contention, what software would break ...Contended Memory, literallyDoes anyone else have the sort of memory where they have trouble just picking out info cold? I know we had a discussion about memory sometime last mo…
... else have the sort of memory where they have trouble just ... we had a discussion about memory sometime last month, but...
memory, but my brain wouldn't ... that's it, my association memory is broken. Its all there ...Contended memory article on WikipediaYeah, apparently there's one. https://en.m.wikipedia.org/wiki/ZX_Spectrum_Contended_Memory [quote] However, the ULA must wait for a Z80 read or wr…
... 's clock and access the memory. As the ULA has no ... advance, it relies upon the memory being available to read to ...SpecEmu 2.1 betaFinally I think I've cracked all the gory contention details required by those trendy multicolour demos (48K/128K modes only, +3 contention can wait …
... memory, so it should be fetched without contension. Simple test ... itself is located in non-contended memory, I can not find ... instruction is located in a contended memory, I find that not ... itself is executed from non-contended memory: in my opinion these ...A few questions regarding EmuZwinI had posted this in the development forum and then remembered there was an emulators forum, so apologies for the repetition. 1. I have been trying …
... have something to do with contended memory, but don't know a ... s almost certainly due to contended memory. See the CSS FAQ for ... /> [/quote]
You can test an emulator's floating bus ... emulation accuracy using Ramsoft's test program:
[url="http:// ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... every time.
A test on real 48K/128K hardware ... the Timex machines have different contended memory areas? I need to read ... needs to be in non-contended memory when it runs.
