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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 ... -
Jumping the sharkBored again, so "inspired" by a post on a forum I read last week (can't find the link, I'm at work now), here's a list of programs that I think have …
... />
If you don't know, "jumping the shark" is internet slang ... Frasier
Fraiser didn't exactly jump the shark, but ... didn't, jump the shark, depending on how you define "jumping ... suffer hugely (like it hadn't suffered enough...).
... -
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 ... -
Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... [/CODE]
taking 27/26 states. And the advantage goes clearly ...
...
[/CODE]
jumping from one to another @ segment ... [/CODE]
taking just 21 states. And wasting a whole register ... on average) only about 8 T-states per line with NO extra ... -
yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
[QUOTE=csmith;506129]AA, couldn't sleep?
[/QUOTE]
... 'system' heap before jumping into the real memory ... long it takes in T states and divide that by ... the number of T states at a 50Hz interrupt ... BTW, you need to count T states, not M cycles when ... -
Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
... IN A,(nn) doesn't and jumping with JP P (or ... for just 3 t-states (from 25 t-states to 22 t-states) and I ... c) wastes -perhaps- 4 t-states, jp wastes 10, next in ... 4+10+12+10 = 36 t-states wasted.
... Now if I add 16 t-states before reading data bits that ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... ROM style encoding. 583/1166 T states.[/quote]That should be perfectly ... /> I've also taken to jumping directly to PROG (thus saving ... -
Can someone run this test program on a real Spectrum 48K?I've knocked up a small test program just to satisfy my emulation OCD if someone with a real 48K Spectrum can spare a couple of minutes to run it.? …
... with tables, contention patterns, counting T states, etc.
Anyway, I ... it's because it's jumping into the rom where the ... -
Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…
... to screen is only 7 t-states. Perfectly acceptable, no need to ... for walking, running, turning, crawling, jumping, falling etc, in both directions ... it's only a few t-states more than using pre-shifted ... -
XYZ - a multithreaded GUI operating system for SpeccyToday I'm re-starting my unfinished project. A few years ago I wrote the yx multitasking kernel (which includes RAM/ROM versions, threads, memory man…
... the background (and not many t-states are spend waiting in 115 ... />
As for paging ... don't know that yet? Any ideas ... area to which we are jumping. If already "compiled" it replaces ... -
LINE-routine and other nice pieces of codeThe line-topic came in the end with a nice piece of fast coding. I think that there might be more of these routines out there (where-ever-u-r). Isn…
... -u-r).
Isn't nice to collect these pieces ... code to start emulating : 36 T states !! (sum (..) ) -
64loader.txtIs the txt file wrong about the 0 and 1 waves? The mechanism that detects the amplitude change on C64 only works in one way i.e. it only detects the…
... pair of pulses (it doesn't matter the length of each ... ) : 616 T-States
Medium (m) : 896 T-States
Long (l) : 1176 T-States
Proxima user programs wantedCzech company Proxima software made/published a bunch of _very_ high quality user programs in 1990-1993 (in Czech), but they seem to be missing from …
... -in monitor that can measure T-states. Can be loaded in any ...ScanlinesHere's an excerpt from the FAQ: [quote] Now for the timings of each line itself: define a screen line to start with 256 screen pixels, then border, …
... All this takes 224 T states. Every half T state a pixel is ... it does so each 4 T states (and then it reads ... 128 T states of screen, 24 T states of right border, 48 T states of ... horizontal retrace and 24 T states ...RZX for Sabre WulfI was just about to send an RZX for Sabre Wulf to the RZX Archive when I noticed they don't accept Ultimate's (and other companies' who haven't given…
... when I noticed they don't accept Ultimate's (and other ... companies' who haven't given permission) files. Why's ... with some additional stuff like T-states.Does ScanLine[0] have a left border?My emulator couldn't handle Cobra or ShortCircuit so I added some rough port FF values. I now want to make it a bit more accurate. The FAQ gives me a…
My emulator couldn't handle Cobra or ShortCircuit so ... /> "Each line takes exactly 224 T states. After an interrupt occurs, 64 ...Linux WAV to TZX convertorsI looked through the posts and seen a few threads about converting WAVs to tzx but none of them are working for me. I have a few old tapes that don't…
... few old tapes that don't load in emulators. I have ... with all the formats and T states, etc, but I can identify ... of a tzx file doesn't show that.
Much the ... be correct and I can't figure the last lot.
Complete Spectrum ROM Disassembly error?I've discovered what looks like an error in the [url=ftp://ftp.worldofspectrum.org/pub/sinclair/books/CompleteSpectrumROMDisassemblyThe.txt]online ve…
... against
approx. 2,400 T states; resetting[/code]
I ...New assember ideaAs i work with Eclipse IDE in my job i become more and more lazy. This leads me to idea that it is time to left Notepad+Tasm combo behind and move on…
The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... is that the chip won't need to be memory mapped ... take the same number of T-states as LDIR.
I ...Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…
... I missing? I just can't see any point however hard ... instruction. It just wastes 7 T-states as far as I can ...DJNZ e ProblemI'm trying to write the DJNZ e instruction as part of the development of my emulator and can't get it to work. Here is the in and out states of Phil…
... my emulator and can't get it to work.< ... is the in and out states of Phil's test ... 0X0000
Run for 132 T states
Memory: 0x00, ... 0x0001
PC 0x0004
T states 135
I ... 0 then
// We don't jump - just update the cycles ...Timing... in the CSS faqI was looking at the CSS faq for something completely unrelated and noticed: [quote] Then the 192 screen+border lines are displayed, followed by 56 …
... (64+192+56)*224=69888 T states long, which means that the ... quartz crystal oscillators. Crystals aren't perfectly stable and do vary ...Q. on a game.How many T-states/kbs/other methods long is the game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0005606&loadpics=3&model=spectrum"]Vulcan…
How many T-states/kbs/other methods long is ... />
Barring that ... how many t-states or whatever (anything) is it ...Graphic enhancements in games!(this message was also posted at [url]http://www.retroremakes.com/forum/viewtopic.php?f=6&t=12431[/url]) Hello to everyone! A couple of years ago I …
... /viewtopic.php?f=6&t=12431[/url])
Hello ... , UnrealSpeccy has a "magic" parameter "t-states/frame -- number of tacts in ...AY tracker routineHi. Yesterday i played with some ay tracks and was surprised how big are tracker routines and music data (over 1.5KB for Pro Tracker routine and 4-6 …
... memory footprint and T-states taken ? Somehow i can't believe that all ... which takes more than 15000 T every interrupt (i estimate that ...PZX file support for ZX-BlockeditorDear readers, I'm working on the PZX format support for ZX-Blockeditor, as I discovered the advantage of having such a nice file format. It has a cl…
... the range of 0..FFFFh (T-States), but the CSW and PZX ... one byte.
I don't know whether this would be ...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…
... worldofspectrum.org/forums/showthread.php?t=19240"]issues[/URL] and ... worldofspectrum.org/forums/showthread.php?t=25880"]wavIDE[/URL], but ... Fuse to introduce a few t-states of delay, so I can ... necessary to measure how many t-states lasts the BSY condition on ...
