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Memory Contention: A Hypothetical Fix?I have just had this crazy thought: If one were to wire an additional memory chip, say a 6264 8Kx8 SRAM, in parallel with the main memory so that it …
... were to wire an additional memory chip, say a 6264 8Kx8 ... , in parallel with the main memory so that it sits in ... to reduce the effect of memory contention considerably. Possibly with the addition ... -
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 Area ...
5B00-7fff 08k Contended Memory
8000-FFFF 32k Fast ... Memory (well normal memory really :) )
Cheers ... -
128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... get my head around the memory contention issues of the various ... best use of the extra memory. I've searched the ... I can understand that the memory is divided up into banks ... what is the cause of contention for banks 1,3, ... due to this apparent contention issue. -
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…
... recently playing a bit with memory contention and floating bus stuff in ... sense it starts applying the contention a few cycles earlier, namely ... -
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? -
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…
... the Timex SCLD still applies memory contention at these locations when ... in port F4 when applying memory contention; contention is applied whether the CPU ... there to fix I/O contention.
Timex SCLDs ... have the fixed I/O contention of the 5C112E and ... -
Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …
... m trying to understand contention and its implications when ... there is both memory and I/O contention. Memory contention causes T1 to ... br />
Also: memory contention makes T1 to be enlarged ... for instance, to avoid memory contention) that begins at the ... -
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?
Writing own emulator: Contention questionsHi! (I don't know if this message should be here or in Hardware) I'm trying to write my own emulator just for the sake of it, and I'm having pr…
... m having problems understanding the memory contention in 48k, in instructions like ... My question is... why 5 memory contentions there? It's like ... to read 5 times from memory when you already have ... is being used there for contention.
...Spectaculator 2.0 availableHi, I've just released a new version of Spectaculator. It should be on WOS in a few days. Here's a cut 'n' paste from comp.sys.sinclair: Spectacula…
... or rewind
o Memory contention and scanline-based multicolour rendering ...ZX Spin 0.3 ReleasedStandard Cut'n'Paste from CSS post again! I can't get to my webpage, so I've uploaded SPIN0.3 to WOS, Alt.Binaries.Comp.Sinclair, and also Daren Pea…
... startup.
Fixed an \"Emulate Memory Contention\" bug
Added Magnum Lightgun ...[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 display ... />
o Changed the contended memory model for the 128k/+2 ...Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…
... page 2 due to the memory contention issue).
How do ... , although info on the 128k memory model in particular would be ...Compatible SpectrumsFollowing some recent coding exploits I've been thinking about compatibility of various models of ZX Spectrum. Yes, it's a common question on the for…
... 2.
Unless my memory is wrong (it's very ... at all... due to the memory contention issues. The +2a/+3 had ... also the issue of different contention timings to the "original" ... hardware contention, surely.
Of course, if my memory ...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…
... fetches the bytes without any memory contention would be nice, too.
Fastest way to clear a screen.We haven't had an optimizing fun for some time, so let's have some: What's the fastest way to clear a screen (i.e., filling the 6912 bytes at 16384 w…
... simplicity let's ignore the memory contention.
To start with ...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…
... ]1. The ability to switch memory contention modes (128k / +2A/B)[/B ... the 128K to the Amstrad memory contention model sing a simple GAL ...TommyGun with Debugginghttp://goo.gl/HfSXev?gdriveurl Ok, so this is a pretty big release for me and I have added a lot of stuff into the code editor. Mainly of course …
... accurate.
Does not have memory contention.
Does not have sound ...POKE taking a variable amount of time...Hi Folks, Does anyone know why the following POKE statements seem to vary in their execution time? [code]100 POKE 60000,10 110 POKE 60001,16…
... this something to do with memory contention? Although address 60000 is outside ...Are 128K games more likely to crash than 48K ones?Hey, guys. I've been doing some experimenting with various games and even some music demos and apps, and I'm beginning to reach a conclusion that …
... . I am aware of the memory contention issues between the Sinclair 128K ...RealspectrumCan anyone tell me why sometimes when I launch realspectrum it locks up on the welcome screen? I am running it in a DOS shell within windows 98. I'm …
... version - there's very little memory contention, and a lot of the ...RealspectrumCan anyone tell me why sometimes when I launch realspectrum it locks up on the welcome screen? I am running it in a DOS shell within windows 98. I'm …
... /> In hardware, make sure that memory contention is *on*. In Control, disable ...THE BEST EMU'I've beem using ZX32 for about a year now.However,certain ROMS such as Double Dragon 1 or Phantomas will not run with this emulator.Is there another,…
... Silverbird? That's one - needs memory contention disabled to work (which means ...Blizzard PassThis is one for testing an emulator since it works with not many. Theres a notice on the inlay. Select 128 basic then enter out 32765,23 then J"".
... contended so maybe its a memory contention problem with emulators. They must ...Darkman on SpectaculatorI'm using version 5.2 of Spectaculator but am unable to get Darkman to load. I've tried it on Spin and it loads fine. Anyone else have this problem?
... it be some effect or memory contention that only Real Spectrum does ...ANN: Spectaculator 5.3 (Speccy Tour players - please read!) Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows 95, 98, ME, NT 4, 2000 and XP. Spectaculator emulates the 16K/48K/128K/+2/…
... to the lack of a memory contention effect.
The Russian ...an idea that could be very very good...but also very very bad...Hello all! I've been having a chat with some of my friends round here that once loved the spectrum (well...2...as they're all heathens round here...)…
... slightly different z80 than the memory contention or ULA. There aren't ...[NEW]: Spectaculator 6.0Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows 95, 98, ME, NT 4, 2000 and XP. Spectaculator emulates the 16K/48K/128K/+2/+…
... quick test):
Your Memory contention is way off, if it ... at accurate emulation, and proper memory contention is a real CPU hog ...[NEW]: Spectaculator 6.0Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows 95, 98, ME, NT 4, 2000 and XP. Spectaculator emulates the 16K/48K/128K/+2/+…
... , heh :)
[quote]Your Memory contention is way off, if it ...[NEW]: Spectaculator 6.0Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows 95, 98, ME, NT 4, 2000 and XP. Spectaculator emulates the 16K/48K/128K/+2/+…
... wrote:
Just turn it [Memory Contention] on, Dunny! More, you can ...
