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Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... TC2048. In any case the T-states for the TC2068, TC2048 and ... what the effect on the T-states would be given that these ... -
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... to know the number of t-states before the first non-border ... at the code!) so don't take it's results as ... -
Quickest Assembly to find if point in rectangleWhat is the fastest way to see if a point is in a rectangle. e.g rectangle is 10,10 100,10 100,40 10,40 how do i know if a point (e.g 20,20) is in…
... the loop, otherwise you won't elimate the last test.
instead of 20 T states, you use 13. -
Looking for rare TZX blocksBy rare I mean out of the hundreds of TZX I have non of the following blocks exist. I need to test my loading/handling/saving code. Are there any TZX…
Luca, standard data block pilot pulses is 3222 not 3223. Are you not adding the final extra pulse of 950 T states even though it isn't read? -
Looking for rare TZX blocksBy rare I mean out of the hundreds of TZX I have non of the following blocks exist. I need to test my loading/handling/saving code. Are there any TZX…
... a extra pulse of 950 T states.
The signal then fades ... a extra pulse of 950 T states.
The signal then fades ... -
Fastest way to write something to screen$Hi, I just got pasmo.exe and start playing with attr scrolling, well, not scrolling, just write different values to a block and see if I can introdu…
... / LD A,B / OR C / JR NZ...) is so slow that it ... -
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,…
... ... AGAIN!
And I can't get an answer.
And ... "cycles" ? I was asking about T states ???
PUSH dd pc ... :3
This don't tell me nothing new, I ... +3=11 but 11 what T-states ? If T-states this is the normal ... -
Hi-Score tableThe score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the ta…
... DE
INC HL
JR NZ,SMAL
DJNZ TEST ; TEST ... TABLE
DEC C
JR NZ,N_ITEM ; TEST NEXT ITEM
Suggestion for EmulatorsHi, Could I make a suggestion as to a feature to be included in future emulator updates. Not so much an emulator feature, rather a feature of the b…
... , b
or c
jr nz, .loop ; this goes to the ... , b
or c
jr nz, .loop ; this goes to the ...Best method for sprite collision detectionHi, I have been trying to incorporate collision detection into a sprite routine I writing. The following is what I have come up with so far: POP D…
... addr.
AND D
JR Z,NC0 ; jump to NC0 ... ) is most common, then using jr NZ,COL and rearranging the code ...Best method for sprite collision detectionHi, I have been trying to incorporate collision detection into a sprite routine I writing. The following is what I have come up with so far: POP D…
... addr.
AND D
JR Z,NC0 ; jump to NC0 ... E ; exact other bits
JR NZ,NC0 ; jump to NC0 if ...Best method for sprite collision detectionHi, I have been trying to incorporate collision detection into a sprite routine I writing. The following is what I have come up with so far: POP D…
... can save a lot of T states if you use regular sprites ...FrameSyncIt was many many years ago since i programmed assembly on the spectrum but I just picked it up again for fun. Now this is one thing I can't remember…
IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... ]
Google... I don't know what is Google :)
t be true. You used INIR ... read, and it takes 21 T states (except last transfer - 1 of ...IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... ) are wrong. It simply can't be true. You used INIR ... read, and it takes 21 T states (except last transfer - 1 of ... at the most I can't see it makes much difference ...IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... ) are wrong. It simply can't be true. You used INIR ... read, and it takes 21 T states (except last transfer - 1 of ...IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... ) are wrong. It simply can't be true. You used INIR ... read, and it takes 21 T states (except last transfer - 1 of ...IDE harddisk emulation usageNot 'howto' question :) I'm curious about how many people tried it. It exists in Spin, Fuse & RealSpec - in last is most interface supported. 8-bit …
... />
Right, INI takes 16 T states. I probably looked into source ...Emulating the SamRAM on the ZX Spectrum SEGerton Lunter gave me permission to reuse the code, but so far I have not been able to get the software to work in paged RAM banks.
... -border byte is around 14321 t-states.
Some border effects ... line up (Aquaplane), some don't (Academy).
[1] I ... guess it shouldn't be too much of a ...Emulating the SamRAM on the ZX Spectrum SEGerton Lunter gave me permission to reuse the code, but so far I have not been able to get the software to work in paged RAM banks.
... possible, a production SE shouldn't include switchable CPU timing, cycles ... scanline length in 1/2 T-States, size of the top & ...Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... to between 589 and 663 T-states on the ZX81 with a ... 3.25MHz clock. 637 T-states looks reasonable upto now.
states that all t-states should be calculated assuming ... 637 * (325/350), or 592 T-States?
MikeWDraft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... pulse is ~637 T-states long)" - but I don't know how accurate ... of tzx specification it states that all t-states should be calculated assuming ... 637 * (325/350), or 592 T-States?
[/quote]
The ...Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... /> - Each "double-pulse" is 975 T-states long, divided into two pulses ... pause.
I haven't considered any additional time for ...Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... to your experience in counting T-states, but those figures just feel ... doesn't do contention, in the spectrum sense anyway. WAIT states are ... when interupts occur so shouldn't affect tape routines.
Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... , but I've counted the T-states once again and the numbers ... /48000)*(59/4)=998.7 T-states at 3.25 MHz, which ... almost perfectly the theoretical 975 T-states desumed from the ROM routine ...Rogue Trooper in "definitely not Stonkers" shock horror![url="http://korax1214.port5.com/spectrum/rogue.html"]http://korax1214.port5.com/spectrum/rogue.html[/url] and scroll to the bottom. :) Er, who's c…
... ;normal opening message
#808d jr nz,#8090 ;#808e,0 to always ...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..
... Ula timings..
after 14336 T-states from the interrupt pulse the ... this byte before, how many T-states before?
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..
... timings..
after 14336 T-states from the interrupt pulse the ... this byte before, how many T-states before?
[/quote]
...
Don't forget that the timing is ... comes into play later (14366 t-states?).
Regarding the ...
