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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 ... -
Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…
... ($40fe and $fffe)
Emulated 48K: [b]1448.1 Hz[/b ... do it myself.
T state breakdown is as follows ... + 13 × 89 + 8 = 1208 T states.
48K: 3.5 × 10^6 ... -
28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... in rainbow effects on the 48k Spectrum, mainly from a ... character wide multicolour on a 48k ([url]http://www.worldofspectrum. ... you go wider on a 48k? I'm not really ... on ZX Spin as a 48k Spectrum. (Based on code ... here at 14238+0*224 t-states, just at the start of ... -
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 ... Spectaculator, emulating a standard Spectrum 48K.
Thanks in advance ... -
testing if speccy is fully functionalHi, There is so much mention of T states but still confused. Does this mean if an instructin is out by a T-state or more then the speccy is faulty?…
... is so much mention of T states but still confused. Does this ... somewhere that speccys have different T states depending on the warmup time ... this not mean that the T-state for all instructions ... processor and memory for the 48k and heatsink models?
< ... -
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…
The 48K Spectrum technical reference page ([ ... cycle 3 will take 3 T-states to read the contents ... start either 7 or 8 T-states after M3: the Z80 ... in the wait states, it will take 32 T-states per byte.< ... screen in situ (either in 48K, or double buffered -- paging ... -
spellbound 48k on a amstrad 128 machine?just curious if it works.. I tried under emulation after someone commenting the tape I sold em didn't work... 48k / + / toastrack work fine.. but on…
... I sold em didn't work...
48k / + / toastrack work fine ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... takes 69888 T-states, the ZXodus Engine takes almost 16K T-states waiting ... the raster beam, about 32K T-states racing the raster beam, ... and over 9K T-states processing the tile map, ... the game itself. The first 48K T-states are inevitable, but if ... -
Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…
... Your circuit won't work on anything but a 48K machine, since ... the video signal isn't present ... T-states, followed by 2 T-states of clock, followed by another 6 full T-states ... can see within about 10 T-states time, the regenerated clock ... -
Hidden message in Down To EarthJust found this in the Down To Earth code. I like reading these old messages left behind by programmers. [code]WELCOME TO ORIFICE Credits Darren B…
... /> Adam Allenfoord
Dead fleshed 48k Spectrum
The Serious ... on a
be-rubbered 48k Specky using
Ye Olde ... /> -How fast ?
140000 T-states a frame.
-And ... Specstrad 128+2 in
48K mode (no keywords on keys ... -
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…
... 5C102 or 5C112 Spectrum 48K. There are 224 t-states per line and ... the data buses. I haven't checked if this is the ... -
The history of ESXDOS, the DivMMC and the DivMMC EnJOY![img]http://benophetinternet.nl/hobby/divmmc_history/1%20esxdos.jpg[/img] These are the stories behind esxDOS, the most popular operating system e…
... more
ROM1 - 48K Basic
SysRam:
48k
keyboard layout)
... instruction, which takes 16 Z80 T-states.
The maximum data ... issues with the ZX Spectrum 48K.
The DivMMC EnJOY! ... -
PUSH scrollers 3[url=https://drive.google.com/file/d/0B-KEeni1WXmoYk9Dek1zVnd6Rk0/view?usp=sharing]CATS - Faith edition (example)[/url] Hello and welcome to the w…
... way to use it in 48K, which is the version you ... /> There's about 10K free T-states each frame, mostly used here ... sprites. There's still some T's left after that, displayed ... -
[Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…
... learning Z80 asm on Speccy 48K, and to start with I ... the registers, instruction set and T-states I came up with the ... -
Spectrum and Z80 emulators with Python APIHello everybody, It may be the right time to create a topic for these two emulators. They are not at the initial release point yet, but might be w…
... and .rzx files. It is 48K only for now, and no ... require doing things like counting T-states for specific routines and automatic ... look like given I don't have to do everything manually ... ) so the resulting code wouldn't suffer from peformance overhead, spending ... -
ZEsarUX 8.0 stableHi! I've uploaded a new FINAL stable ZEsarUX version, 8.0 :) You can download it, as always, from the url: https://github.com/chernandezba/z…
... last opcode lasts >=32 t-states and interrupt in the middle ... right: for example, "Spectrum 48k" becomes "ZX Spectrum 48k", etc
Fixed ... -
Castlevania ZX looking REALLY nice in color :)[url="http://www.redeya.com/bytemaniacos/castlevania.html"]http://www.redeya.com/bytemaniacos/castlevania.html[/url]
... you have 448 T states between each update (working from 48k timings). Essentially ... first attribute map. After 448 states two lines are drawn. ... attribute set, wait another 448 states, then do the 3rd ... claws back a load of T States for use elsewhere).
< ... -
Fake screenshots? No - now it's REAL screenshotsOk then. A few weeks ago I said I will show You the new gfx-mode of Speccy and - here it is: [url="http://republika.pl/hooy_prg/hprg.zip"]http://rep…
... pixels - and you can't even manipulate memory that quickly ... solution for doing it in 48k as well as 128, ... way to do it in 48k, which is my goal.[/ ... I don't see how it's achievable on a 48k - it ... will take around 100000 T-States to copy ... -
Fake screenshots? No - now it's REAL screenshotsOk then. A few weeks ago I said I will show You the new gfx-mode of Speccy and - here it is: [url="http://republika.pl/hooy_prg/hprg.zip"]http://rep…
... I don't see how it's achievable on a 48k - ... it will take around 100000 T-States to ... things those, i don't know why programs have ... ! Geeeeez ) you don't even imagine how many coders ... br /> [quote](But not on 48K, again, processor speed).[/quote]
Z80 to TZX Converter !Hey Everyone ! I have a bit of time lately and I coded a little utility that can convert the Z80 snapshot (any version, 48k and 128k supported) to T…
... AWE32 and REAL ZX Spectrum 48k and 128k +2
- Spin ... version. The timings is 200 T-States for bit 0 and 400 ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
...
* How long does the 48K ULA hold /INT low?
48K machine, this is generated by ... exact value for the 48K machines is not known ... cute trick on the 48K machine would be to ... M cycle takes 2 more T states than usual when ?INT ...I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... . You need to copy the 48k ROM file into the bottom ... opcode takes a number of T-States to complete. Keep a counter ...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 ... far higher quality than the 48k, 128k black box or TC2048 ... what the effect on the T-states would be given that these ...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.
... exactly the same as the 48K machine.
[/quote]
t-states.
Some border effects ... line up (Aquaplane), some don't (Academy).
[1] I ... guess it shouldn't be too much of a ...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?
T1 on 48K/128K/+2. T2 on a ...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 ... this byte before, how many T-states before?
[/quote]
t-states?).
Regarding ... cssfaq/reference/48kreference.htm#Contention"]48k[/url] and [url=" ...RealXThis may be a dumb question but will RealX ever get released?
... different offsets used to count t-states, that's all.
Anyway ... is testing the 48K timings with a logic states analyser and a ... find the real values for t-states offsets (first contention, electron beam ...
