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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 ... to generate the pic.
I think this 11 T states info ... -
Difference in emulator screen sizes and coloursSeeing as Greencard's gone out drinking... I've done a comparison between Spectaculator and ZXSpin. ZXSpin's full screen with border is taller than S…
... cycle. Some use it to generate fantastic effects, such as full ... 224 T states.
After an interrupt occurs, 64 line times (14336 T states ... . All this takes 224 T states. Every half T state a pixel is written ... -
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 ... line takes exactly 224 T states. After an interrupt occurs, 64 line times ... ]! If a TV could display every line would the left border ... -
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 ... -
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…
... code. Which doesn't actually use auto increment ... the full address with every read or write anyway ... Which is many many more T-states than an INIR instruction!
... in less than 50 T-states on average - at ... eat up 30-odd T-states including the c register ... -
What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... approx. 14,000 T states. But if
an 'edge' is found ... CALL 05E7,LD-EDGE-1 Every edge is considered until< ... subroutine takes 465 T states, plus an additional 58 T states for each ... -
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…
I don't think you can see the ... might add some 10-20 T states per an OUT perhaps, but notice ... that this happens once per 1208 T states ... ]
Here, an OUT occurs once every 52 T states regardless of 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.…
... mirroring an 8x8 character square on screen. It takes 450 T-States including ... the RET, if every bit needs mirroring ... byte mirror table takes 333 T-States for an 8x8 character square. Not ... -
Running code from the display memory?Is it possible to run machine code from the memory area used by the display file? If you were really out of memory and some part of screen is not u…
... border (the first ~14000 t-states from an interrupt), it will run at ... -
Running code from the display memory?Is it possible to run machine code from the memory area used by the display file? If you were really out of memory and some part of screen is not u…
... border (the first ~14000 t-states from an interrupt), it will run at ... />
BUT, all this desn't apply to +2A,+3, where ... -
Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …
... book - I don't know if there is an errata someplace that ... corrects them. But 64x224 T states after an int is generated in ula ... -
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…
... - it will take around 100000 T-States to copy a screen from ... maybe i try boulderdash clone!!!". every single one said that. hahaha ... to approach it differently, in an unorthodox way. then if it ... used BMP2SCR last year to generate the faked "Halo" screenshot for ... -
Assembly Programming for IDIOTSOk are there any websites guides for what opcodes do in a z80 or books... but for really really thick people like me :-) Something along the lines …
... t generate interrupts every time you move the stick, as it would generate an ... t actually generate analog values via the "stick" but simple on/off states ... register for every device that can generate interrupts, ... vertical retrace, keyboard) generate a high rate of ... -
BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…
... width Tw seconds repeating every Ts seconds, the spectrum ... isolated pulse with samples every 1/Ts Hz. In ... minimum pulse width of 79 T states (79 / 3.5e6 seconds ... why you are needing an 88kHz sample rate. Needing ... fast. The ULA not generate a perfect square wave ... -
BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…
... . Divide T-States of pulse by 5.
T-States of OTLA ... between 6 and 20 timer every byte [average resync is ... This data are used to generate the LOAD data to ... why you are needing an 88kHz sample rate. Needing ... why you are needing an 88kHz sample rate. Needing ... -
48k AudioI'm at the point in my game where I could use a few beeps and bloops. Ive been looking at loads of different speccy books, but this whole business of…
... take just as long every cycle of the game. ... the screen display, 250-500 T-states (320-640?s) long ... each such chunk, using an extra data pointer, do ... /24 values you can generate screechy tones in the ... different pattern into the buffer every few frames).
Command and Conquer type game?Hey all One of my all time favourite games although not spectrum based, is the Command and Conquer series. I'm sure many of you are famailiar with…
... this demo, it will randomly generate a full screen map like ... />
If you are using an emulator, at this point you ... /> This algorithm is available as an Assembly library you can freely ... only once every 3 frames, spend only about 10K T-states each time ...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, …
Here's an excerpt from the FAQ:
< ... . All this takes 224 T states. Every half T state a pixel is written ... 4 T states (and then it reads two: a screen and an ATTR ... : 128 T states of screen, 24 T states of right border, 48 T states of horizontal ...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 …
... ?
3) Is here an utility dedicated to create compact ... memory footprint and T-states taken ? Somehow i can't believe that all ... which takes more than 15000 T every interrupt (i estimate that Pro ...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…
... the 'ready' check after every sector when you do a ... necessary to measure how many t-states lasts the BSY condition ... controller has to perform an address coordinate translation which it ... solid state memory (which employs an internal linear sector addressing). ...Screen Viewer: Speccy View 4SpeccyView (v4.0) Here is my new zx spectrum screen viewer, result of this weekend's work. Features: Loads: -Standard Screen Files (6912 byte raw …
... to manually resize it back every time you open a screenshot ... /> Ps. Don't expect to get images from every Tap/Tzx file ... and scr files will always generate an output.Rendering techniques in emulatorsI've been giving thought to the possibility of speeding up the rendering in Zero considering I've been putting it off long enough. My approach is c…
... to the screen backbuffer every frame (69888 t-states that is). Swap ... speccy display to backbuffer every frame. Am not even ... pure assembly and doesn't use any multithreading or ... use a LUT for every conceivable bit combination for ... that's not an option ok? ;)WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
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... Xilinx states in an app note that 270 ohm ... be 5V tolerant and doesn't need the configuration ROM. Actually ... routing flexibility, DCM modules to generate clocks, and enough fast block ... is working, the machine won't boot.
Before ...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…
... this task? Instead of an analogue voltage controlled oscillator being ... it by 32 and generate a new and very ... T-states, followed by 2 T-states of clock, followed by another 6 full T-states ...
Is this enough for an entire scanline of maximum contention ...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…
... a way to ensure that an IM 2 interrupt handler 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 ...Fuse - HelpAs some of you might have guessed already, I'm kind of doing a rampage on a lot of emulators, to test things out, and find the most suitable for deve…
... file somewhere that I haven't seen yet, that has ... I decided to start trying every single menu/option, to start ... />
Register, T-States, Memory Map, ok...
An empty table, on ... this lists (column names, didn't help much).
Another ...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…
... on github return t-states after executing an instruction, giving you ... the screen ray came after every instruction, and draw just ... an instruction has 4 t-states (and may have up to 23 t-states), isn't ... but if you measure loop every second, you can adjust ...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…
... ). Also, ZXAM always behaves like an Issue 2 machine.
On an Issue 3, an OUT 254 with bit ... from approximately 180 T states (about 50 microsec) to 2800 T states (about 800 ... , the speaker is called for every keystroke, and the ROM beep ...
