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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 ... -
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…
... Spectrum clone now shows full timing compatibility
with the ZX ... that will test the _memory_ contention
(or anything else for ... -
Fuse for Mac OS X 0.10.0 ReleasedA new version of Fuse for Mac OS X has been released at the dedicated sourceforge project and shortly here on WoS: [url]http://sourceforge.net/proje…
... (but probably not perfect) TS2068 contention (Philip Kendall).
[*] Various other ... Meunier).
[*] Tweak TS2068 display timing (Fredrick Meunier).
[*] Fix crash ... -
48k Timing Tests...Here's v1 of the timing tests for the 48k Spectrum, with a little background [IMG]http://www.zxspectrum4.net/images/timing_test_v1.jpg[/IMG] [URL="…
Here's v1 of the timing tests for the 48k Spectrum, ... -
Most accurate timingWhich emulator is closest in timing to an actual (48k) spectrum? A count to 10,000 loop, printing the loop number each time on screen - same snapsho…
Which emulator is closest in timing to an actual (48k) spectrum?< ... />
Hmm.
Getting accurate timing for sound is going to ... -
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:
Zero 0.5 ReleasedAfter a bit of a hiatus, the next update of Zero is now available [URL="www.ramtop.wordpress.com"]here[/URL]. Feedback and bug-reports appreciated! …
... opcodes (Woody).
- Fixed IN contention (Woody).
- Fixed ULA PLus ... and renderer (Woody).
- Fixed timing for EX (SP), HL/IX ... . (Obo)
- Fixed ULA Plus timing and colours (Andrew Owen)
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…
Is the timing of the Timex Computer 2068 ... 6C001 ULAs. The contended memory timing seems to be the same ... ; however the I/O timing is quite different, not least ... test the contended I/O timing. Plenty of other ports should ...ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…
... ), and it doesn't apply contention to take precedence as usual ... ] I once borked up the timing somehow such that it scrolled ...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…
... Timex SCLD still applies memory contention at these locations when ... each location during the beep timing loop.
When ... port F4 when applying memory contention; contention is applied whether the ... sync pulse and colour burst timing. You get a nice, ...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 ...Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…
... Aug'87. Apart from a timing comparison I also did a ... />
Here's the BASIC timing routine which I use. The ... in line 9994. The first timing should be done with 9994 ... get the loop overhead. The timing for that is then deducted ...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 ...A Yankee in IraqI'm testing the game on the zx next and it currently hangs right after the game starts no matter what timing regimen and contention pattern is chosen…
... starts no matter what timing regimen and contention pattern is chosen (48k ... it measuring frame length or contention pattern?
I know ...5C Horizontal timing vs 6C horizontal timing.Hi all, Just considering the timing difference in the video signal between the 5C and the 6C where the 6C ULA seems to have 50% longer horizontal …
... ,
Just considering the timing difference in the video signal ...Zero v0.8Pigs can apparently fly because it's the v0.8 update of Zero that no one asked for but is out for public consumption anyway. Grab it [url="https:/…
... behaviour (ZJoyKiller).
- Fixed +3 contention bug (woody)
- Fixed mic ... . (woody)
- Fixed screen flip timing during 7ffd out - passes ptime ... mode (Hexaae).
- Fixed +3 contention bug (woody)
- Fixed issue ...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 …
... Ramsoft start dishing out some timing info... mind you, in my ... very little memory contention, and a lot of the timing is out ...Anyone got a copy of 'Z80 for primates'?This Z80 lark isnt easy, in fact it makes me feel very much like Washoe the chimp trying to learn learn sign language, I just dont think I've got the…
... above 32768 is sensible (for contention issues with ULA memory and ... use IM2 to get the timing right (and I'm guessing ...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,…
... a sensitive loader and the timing values being slightly out for ... ? That's one - needs memory contention disabled to work (which means ...TZX compatibility issuesI seem to have a problem with using TZX files on different emulators. Specifically, files Saved As TZX from emulator. I better explain: I have a fe…
... specification, which states that one 'timing unit' (you can call them ... by the 128K ROM (barring contention effects, which the TZX format ...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...)…
... had Pentagon/Scorpion/Sinclair spectrum timing modes available. The issues I ... 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/+…
... :)
[quote]Your Memory contention is way off, if it ... can select (at least try) timing "on fly" without resetting Speccy ...[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/+…
... [Memory Contention] on, Dunny! More, you can select (at least try) timing ...
