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Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... not part of a grand cycle timing scheme (and it is not ... -
Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... ]
For a more detailed timing breakdown I use: [url]http ... />
I use the machine cycle timing diagrams in Zilog's z80 ... instructions with descriptions, opcode bytes, timing and flags affected. Very handy ... -
The Pros and Cons of "alternative" assembler syntaxContinuing from [URL]http://www.worldofspectrum.org/forums/showpost.php?p=720754&postcount=72[/URL] [QUOTE=u6c87;720754]But that wouldn't change if…
... , some display engine that needs cycle timing to change colours each scanline ... -
ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... respond at the Z80 memory cycle timing. Using the Z80 CPU's ... -
ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... respond at the Z80 memory cycle timing. Using the Z80 CPU's ... -
ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... respond at the Z80 memory cycle timing. Using the Z80 CPU's ... -
border effectsive been playing around with border effects like 10 border 1 20 border 2 30 pause 1 40 goto 10 ,etc i even wrote one in machine code. …
... need the speed and accurate cycle timing of machine code if you ... -
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…
... first time at least 1 cycle after it happens). The ULA ... few cycles earlier, namely 1 cycle on 48k and 3 cycles ... say (isn't the 1 cycle a bit too late, though ... , as well as correct any timing information stated above. I would ... -
Nasty 'Gotcha' for multicolour timingI thought I would be better developing my multicolour routine on the 48K first, being the slowest, so it would then be sure to work on the 128K varia…
... awkward it even throws up timing differences between the 128K and ... +2A, with only one uncontended cycle in 8, you miss the ... get ahead on the contention cycle. Assuming that writing those colours ... -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... sure I got the ULA timing 100% right. We know ... :
- the last T cycle when there is no black ... .
- the first T cycle when the black bar appears ... uses early or late CPU timing, please run the btime test ... and report the first T cycle when the red bar ... -
TimingHey All, Is their away of obtaining timing information on ZX128k other than addresses 23672->23674. Basically I would like to identify every 100th …
... /> Is their away of obtaining timing information on ZX128k other than ... -
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.. -
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…
... I added support for Pentagon timing instead, so I can finally ... the floating bus behavior and timing. An explanation how the ULA ... -
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, ... -
ZX80 and 81 hardware questionsI'm finding a lot of the documentation that is ostensibly about the hardware of the ZX80 and 81 to be primarily about the software. I was hoping some…
... and post during the refresh cycle (I'm not an engineer ... sources diverging on the exact timing - can anyone help?
cycle timer that's zeroed by ... -
Light Cycle release not covered in its entryAs per this thread: [url]http://www.worldofspectrum.org/forums/showthread.php?t=1354[/url] There should be a STP for Light Cycle from Soft&Easy (19…
As per this thread:
[url]http://www.worldofspectrum.org/forums/showthread.php?t=1354[/url]
There should be a STP for Light Cycle from Soft&Easy (1984) ;) -
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 ... -
Cycle exact emulation?I was just reading the thread about +3 emulation having different results on different emulators, and it made me wonder if any Spectrum emulators hav…
... emulators have reached the fabled 'cycle exact' status. There are some ... are, or claim to be, cycle exact, giving them theoretically 100 ... BSNES, I'd imagine a cycle accurate N64 emulator might well ... 'd tend to think that cycle exact emulation would probably be ... -
Timing in loading routinesJust for curiosity I have done some experiments with SAVE command in accurate emulators, and then analyzing the generated WAV and I have obtained lit…
... one.
All this timing is for 48K machines. The ... -
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…
... the first 4T of each cycle (order: bitmap, attribute, bitmap+1 ... ] I once borked up the timing somehow such that it scrolled ... -
Light Cycle (Krypton Force)I've just found a cassette of Light Cycle by Krypton Force. I see no mention of this title being released by kryton force. It came with a kryptronic …
... found a cassette of Light Cycle by Krypton Force. I see ... -
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…
... read from there at every cycle. If there is any, please ... />
5. Yet no +3 timing emulation, though some provisions are ... -
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 ... -
ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... Spectrum ROM chip timing shows that its' read cycle is 250ns. A ... -
Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…
... Jan Bobrowski to explore the timing of screen switching. The new ... to explore on which machine cycle a small strip appears at ... Q button to increase the cycle number), what color the strip ... -
Witchcraft: Nirvana, Bifröst and such[url="http://www.rgcd.co.uk/2011/10/buzzsaw-zx-spectrum.html"]"When considering this next to nearly every other ZX Spectrum game though, Buzzsaw is l…
... of games that exploited clever timing of colour changes within the ... in the multi-colour area cycle around in that area.
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 ...
