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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…
... a correct map for memory contention?
Address Size Area ... -
I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... .s faq describing I/O contention.
The 48k ... to lead to the following contention patterns:
High ... /> in 40 - 7F? | Low bit | Contention pattern
------------+---------+-------------------
No | Reset ... -
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…
... playing a bit with memory contention and floating bus stuff in ... sense it starts applying the contention a few cycles earlier, namely ... -
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…
... 0x7ffd, 0xbffd and 0x3ffd port contention behaviour.
... However, I find that contention is applied too often ... /> To correct the excessive contention, I replicated ULA14 and ULA15 ... someone describe accurately the contention behaviour for the 128K ... -
BIT b,(ii+n) contentionThe documentation says that BIT b,(ii+n) has this contention pattern: pc+1:4,pc+2:3,pc+3:3,pc+3:1 x 2,ii+n:3,ii+n:1 See [url]http://scratchpad.wiki…
... b,(ii+n) has this contention pattern:
pc+1 ... Tstate.
So the contention pattern should be:
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 …
I'm trying to understand contention and its implications when some ... both memory and I/O contention. Memory contention causes T1 to be ... ?
Also: memory contention makes T1 to be enlarged ... for instance, to avoid memory contention) that begins at the ...Question of contentionI'm not desperate to go digging through technical descriptions in depth, but one thing bugs me about the Speccy's video contention model - and that's…
... about the Speccy's video contention model - and that's the ... /> And then there's the contention pattern where the memory is ... 16, so that means the contention pattern covers a run of ...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…
... my head around the memory contention issues of the various 128K ... what is the cause of contention for banks 1,3,4 ... downs due to this apparent contention issue.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 …
... reduce the effect of memory contention considerably. Possibly with the addition ...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…
... having problems understanding the memory contention in 48k, in instructions like ... is being used there for contention.
Thanks ...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…
... 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…
... .
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 ...ANN: "Sam Revival" magazine issue 7 out now (SamCoupAs there's been a few posts in these forums about the Sam Coup? I thought I would mention that issue 7 of the 'Sam Revival' magazine is out... Insid…
... off with 'MODE 1
Contention' where Simon Owen has carried ...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 …
... 've cracked all the gory contention details required by those trendy ... (48K/128K modes only, +3 contention can wait for another day ...ANN: SpecEmu 2.3 - Minor UpdateHere's a minor update to the SpecEmu emulator - the emulator with an incredibly small filesize for a Win32 application, and backed up with an incredi…
... /> - Fixes to some overlooked opcode contention timings.
- Improved floating bus ...how do you view 'delta compressed' videos from BMP2SCRusing BMP2SCR, you can compress AVI to a chain of binary files, and the help file says something about streaming .TAPs. However the BMP2SCR manual ha…
... etc, my only bone of contention about this otherwise excellent utility ...People suckPeople suck, thats my contention, gimme a pen and paper, an etchosketch, I'll prove it, the truth, the fact, the factorum. I'm tired of this back sta…
People suck, thats my contention, gimme a pen and paper, an etchosketch, I'll prove it, the truth, the fact, the factorum. I'm tired of this back stabbing arch-humanity bullshit. We are a virus with shoes.
Now who said that?Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..
Hi,
Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle?
I mean which Z80 clock cycle, T1 or T2?
Thanks..SimCoupe 1.0 released[size=-2](for those of you that don't read CSS)[/size] SimCoupe, the SAM Coup? emulator, has been updated to version 1.0. This major release adds ma…
... uncontended [Dave Laundon]
- Fixed contention across page boundaries [Dave Laundon ... ]
- Improved efficiency of contention table lookups [Dave Laundon]
ZXSpin 0.61 Available nowHi all! Well, after a lengthy few testing cycles, I'm taking the plunge and uploading the latest version of ZXSpin, to replace the rather aged old 0…
... accurate "ULA snow" and IR contention. Note that truly accurate snow ...Windows VistaNever installed my Beta version, too many bad reports. Anybody tried it yet? I was reading a report that said serious 3D acceleration was required …
... -board graphics chipsets out of contention - anybody know what the truth ...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…
... 2 due to the memory contention issue).
How do ...SpecEmu 2.4 releaseSince SpecEmu has been at 2.4 beta for as long as I can remember I think it's about time I made a proper 2.4 release for its users :) Major new feat…
... automatic loader detection.
* Improved contention model for multi-colour demos ...Sam Revival Back Issue Bonanza!As a special offer throughout March, i'm giving 25% off back issues of Sam Revival magazine. So if you are looking to fill in gaps in your collection…
Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…
... support (Stuart Brady)
[*] Fix contention for LD?R, CP?R ... (Stuart Brady)
[*] Separate out contention when MREQ isn't active ... the +2A/+3 ULA applies contention only when MREQ is active ...Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…
... that will test the _memory_ contention
(or anything else for ...
