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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 ... -
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 ... -
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 ... -
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 ... -
+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 ... -
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? -
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 ... -
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…
... delay before a single contended instruction and then measuring ... to run [URL="http://zxds.raxoft.cz/taps/misc/progforhackers ... 2 T-states before the contended memory T-states.[/QUOTE]
... that T-state is contended by the memory contention!!)[/QUOTE]
... -
Changing the colour of the loading 'stripes'I was wondering if it were possible to alter the default colours of the standard ROM loading 'stripes' via BASIC, mabye a POKE command of some descri…
... /saving code cannot run from contended memory at 23762; the main code ... sits in upper memory from 65169 to 65535 so ... Spin .... even a PZX using ZXDS, but whatever I do, I ... -
[NEW]: Spectaculator 4.0Hi everyone, Finally managed to finish it... enjoy! --- [NEW]: Spectaculator 4.0 Spectaculator is a Sinclair ZX Spectrum emulator for PCs runnin…
... .
o Brand new memory contention system and cycle-accurate ... .
o Changed the contended memory model for the 128k/+2 ... ,3,5,7 are now contended rather than 4,5,6 ... -
Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…
... FAQ.
As for contended memory and finite-speed screen refresh ... -
ANNOUNCE: Fuse for Mac OS X 0.7.0Following the release of Fuse 0.7.0 is the unsurprising release of Fuse for Mac OS X 0.7.0 which should be available for download shortly at the Fuse…
... ZXCF support.
+ Much improved contended memory and floating bus emulation.
(Belated) ANNOUNCE: Fuse 0.7.0 and libspectrum 0.2.2 releasedThe Fuse team is pleased to announce that release of Fuse 0.7.0, the associated utilities and version 0.2.2 of the Spectrum emulator support library,…
... ZXCF support.
+ Much improved contended memory and floating bus emulation.
A few questions regarding EmuZwinA few questions regarding EmuzWin 1. I have been trying to write a program to generate multicolour effects on the Spectrum,ie more than 2 attributes…
... have something to do with contended memory, but don't know a ...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 ...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 ... ULA must access the video memory to generate the pic.
Which would be fasterSay you want to use a variable value of 0 to 255 in a BASIC program, which way would be fastest? Say for arguments sake you wanted to use two variabl…
ZX Spectrum technical information wiki[With vague apologies for the multi-post] In order to push out updated information quicker than is currently happening with the [url=http://www.worl…
... ] and contains updated and improved contended memory information compared with that currently ...ZX Spectrum technical information wiki[With vague apologies for the multi-post] In order to push out updated information quicker than is currently happening with the [url=http://www.worl…
... ] and contains updated and improved contended memory information compared with that currently ...ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... reads from random places in memory so it doesn't guarantee ... .
But how is contended memory refreshed? By constantly reading from ...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 retrieved from memory by the ULA to ... border, and starts reading memory to generate the work area ... bus cycle that might affect contended memory, and the ULA stops ... to the ULA) as contended I/O if A8-A15 ... is, IN 255 is not contended.
Here you ...How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…
... and fourth?) Z80 shared our contended memory, then we could "easily" ... , has access to the contended memory, but only when neither ... multiple values in adjacent memory locations, by having CPU1 ... we replace the existing memory with faster memory, would we then ...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…
... /> Speed-up slow ZX memory (contended memory pages)
Hardware unrainer and ... extended ram
- DIVIDE memory emulation
- MB02 memory emulation
- software ... controlled NMI button
- memory paging compatibilty with all popular ...
