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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,…
... PUSH DE should take 11 T-States to be executed.
T states looks OK, but shouldn't it take longer ... interrupts disabled but that shouldn't change the fact that the ... />
I think this 11 T states info is normal situation and ... -
Scrolling loader counter in 85 T-States?Would it be possible to write a scrolling loader counter in 85 T-States? I have a custom screen load routine that loads attribute first, then the …
... scrolling loader counter in 85 T-States?
I have a ... scrolling load counter in 85 t-states. Should be possible to update ... stack useage. My loader doesn't touch the stack, no calls ... -
IDE emulation and delaysA few months ago I was told that IDE emulation, while perfectly usable, isn't accurate enough to compare it to IDE access on real hardware. On some e…
... necessary to measure how many t-states lasts the BSY condition on ... The emulator should assign a wait time to the emulated IDE ... performed prior to implementing this. Wait times may vary from one ... sector address.
The wait time also depends upon the ... -
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... 3 will take 3 T-states to read the contents ... the ULA to release the wait state first. Machine cycle ... gap in the ULA wait states before it can write to ... start either 7 or 8 T-states after M3: the Z80 ... gaps in the wait states, it will take 32 T-states per byte.< ... -
BIFROST* Advanced Programming - part 6The purpose of this demo is somewhat different from previous ones. Instead of teaching a new technique, the main goal here is to demonstrate how much…
... .org/forums/showthread.php?t=40556"]last demo[/URL]). ... start
BIFROST_start();
// wait 14 frames (enough time to ... Each movement takes about 10K T-states on average (half the ... The remaining tiles (that don't move around) are animated ... -
Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…
... starts always at the same T-state (related to the moment ... to last a number of T-states which is a multiple of ... portion of instructions that aren't HALT last a number of ... -
How do emulators make code appears as running at 3.5Mhz?Decent Z80 emulators on github return t-states after executing an instruction, giving you the ability to emulate Speccy relatively well. But there ar…
... emulators on github return t-states after executing an instruction, ... are two issues I don't understand yet.
t-states (and may have up to 23 t-states), isn't ... 's resolution). Speccy t-state is 1/3 ... a fast machine) and wait for the rest in ... -
WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully but the incorporated datacorder is simply worn out and won't load ANYTHING. Dirty sig…
... faster programs the situation isn't so simple, as there is ... /> OUT (254),A
HALT ;wait 20ms
LD A,#08 ... from approximately 180 T states (about 50 microsec) to 2800 T states (about 800 ... -
ZX Spin 0.4 available for Download.Standard Cut-n-Paste from the CSS post: If all goes well, I'll upload it to WOS on monday. ----------------------------------------- Okay, it's th…
... are more interested in more T states per frame and hence less ... the contended memory and processor wait states/clock halting.
Fraser ... -
Castlevania ZX looking REALLY nice in color :)[url="http://www.redeya.com/bytemaniacos/castlevania.html"]http://www.redeya.com/bytemaniacos/castlevania.html[/url]
... that basically you have 448 T states between each update (working from ... first attribute map. After 448 states two lines are drawn. You ... the 2nd attribute set, wait another 448 states, then do the 3rd ... claws back a load of T States for use elsewhere).
< ... -
ZX81 and ZX80 emulator on Spectrum 128KA couple of weeks ago we were talking about a new ZX81 emulator for the 128K. Someone beat me. More details at [url="http://www.fruitcake.plus.com/S…
... 12kHz (each pulse is ~637 T-states long). [B]After each series ... only 2 levels.
Wait a minute, I think I ... . The "pause" mentioned here isn't silence - it's simply the ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... cycle description says that 2 T states are added to M1 to ... acknowledge cycle. It states that two wait states are automatically inserted to ... settle) + 2 automatically inserted wait states during which time /IORQ is ... />
Now, I don't know why it's not ... -
On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…
... bytes gets copied in 51200 T states which is < the ... Spectaculator reports the number of T states since the last interrupt -- ... interrupt. There are about 14000 T states spent by the ula drawing ... drawn on screen. If you wait out this time before starting ... -
Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…
... this. I prefer the counting T states method, but make use of ... in 14000 T states. The jitter between machines doesn't matter -- wait an extra ... even if jitter is 200 T states. If doing multicolour effects, ... machines in the number of T states spent in the top ... -
Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…
Judging by the quoted number of T States it's probably a routine to wait for screen sync. -
Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…
... for the correct number of t-states, or by performing another task ... in, then you need to wait until the raster has cleared ... -
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 ... ZX81 doesn't do contention, in the spectrum sense anyway. WAIT states are ... when interupts occur so shouldn't affect tape routines.
Groundbreaking gamesWhich games really broke new ground? I mean the ones that actually got around the hardware limitations of the Spectrum. For example: Aquaplane - f…
... intros and the like isn't too hard, as programmer ... doesn't have to worry about doing ... ...[/QUOTE]
I don't think that Aquaplane used some ... lot of CPU time to wait exact moment after interrupt ( ... always have same count of T-states.Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... the comments are correct regarding T-states, but there you go.
t work and I'll have ... at it. Sorry it ain't pretty :)
[CODE]
; enter with HL = t-states to wait
; Pre-req: HL > ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
...
; enter with HL = t-states to wait
; Pre-req: HL > ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... to work... if you don't it'll just return.
t states.
And due to some ...
; enter with HL = t-states to wait
; Pre-req: HL > ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
...
; enter with HL = t-states to wait
; Pre-req: HL > ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... even more. This version doesn't change the overhead (still HL ... />
; enter with HL = t-states to wait
; Pre-req: HL > ... above bit of code won't fit.
ALIGN 16
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... 'bout another version while we wait for Patrik to test his ... takes 17), but that doesn't make for a very usable ... />
; enter with HL = t-states to wait
; Pre-req: HL > ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... available. You may want to wait for the installer, which will ... you can work out the T-states and such :grin:
[/ ... This all checked with Spectaculators T state counter, no mental gymnastics ... images, but I don't know without seeing the difference ...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…
... which of all four T states are contented and which ... The first one can't be certainly contended by IO ... memory contention.
Now wait, wasn't the #7FFF supposed to ... This is weird, isn't it? How would ULA know ... Isn't it more like that not all four states are ...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…
... (and TW for IO) using ~WAIT. Sinclair forces CLCK high instead ... cycles. This doesn't tell us which T states were contended and by ... much, nor how many contended T states there are. Then we can ... the first and last contended T states, by running the instruction at ...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…
... (and TW for IO) using ~WAIT. Sinclair forces CLCK high instead ... br />
Ignore the CPU ~WAIT signal - You [B]cannot[/B ... cycles. This doesn't tell us which T states were contended and by ... the first and last contended T states, by running the instruction at ...Ahh.. the tape loading era! by ate bit[url]http://www.pouet.net/prod.php?which=53846[/url] It is UNBELIEVABLE!!! Effects while loading, MUSIC while loading (and loading normal speed !!!…
... /> [/QUOTE]
Haha, I don't know! I *do* know that ... 'll see the comment "Wait 358 T states before entering the sampling loop ...The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…
... font install after reset. Add wait loop from adress 1 on ... paging within a few thousand t-states of a reset, or something ... . This is why I don't do hardware :-)
Now ... /> [QUOTE=cheveron;385030]
Haven't managed to get it to ...
