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Between interrupts and handlersSee there's this short period of time immediately after an interrupt comes but [i]before[/i] the control is transferred to an interrupt handler, abou…
... Tstate already part of the interrupt it self, the actual ... several Tstates, so is the interrupt handler starting Tstate.
< ... in width (does any non-documented instruction last longer than ... moment the ULA triggered an interrupt. For example, the code ... -
Jelly-Vision!As threatened in the "'Spectrum Play' Error" thread, here's a ruff'n'reddy interrupt driven full screen wobbling routine which has no practical use w…
... either. I've tried several non-Jelly Z80s, and they all ... . Is it possible for an interrupt routine to turn itself off ... -
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... 8759 T-states after the interrupt, and repeats every 228 T ... Spectrum 128K [I]with normal (non-late) timing[/I] using either ... ]EDIT: Added information about normal (non-late) timing, fixed incorrect calculation ... -
The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…
... interrupts should boot with its interrupt generators disabled.[/QUOTE]
... be run on the 50Hz interrupt (additional interrupts may make ... for hardware that will generate maskable interrupts:
1. make ... * you have generated an interrupt (this is what the ... -
TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…
... T-states earlier than "normal" (non-late) ZX-Spectrum 128K timings ... 8759 T-states after the interrupt'. Help! :) -
Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…
... mouse routine in the 50Hz interrupt is not good enough to ... more than one pixel each interrupt so that you could move ... more responsive mouse behaviour from non-mouse devices by changing the ... moves one unit physically. The interrupt routine then can adjust an ... -
Barn find #4I think this is some sort of backup device. Its got "007" on the motherboard and the mice have chewed the buttons. Will do a little research later in…
... will not be able to interrupt the Z80 CPU.
Now ... in RAM, one which disables maskable interrupts, the paging of the ... -
Asm routine for AY playback?Hi, is possible to create and "name" an asm routine for playing some ay data? If yes, how? Example: Ok , I've finished a sound tracker song, now I n…
... action is happening. Using an interrupt routine is a common way ... 't *need* to use an interrupt routine - if you have a ... Fuller Box that run on non-standard ports (let me answer ... -
Asm routine for AY playback?Hi, is possible to create and "name" an asm routine for playing some ay data? If yes, how? Example: Ok , I've finished a sound tracker song, now I n…
... action is happening. Using an interrupt routine is a common way ... 't *need* to use an interrupt routine - if you have a ... Fuller Box that run on non-standard ports (let me answer ... -
z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…
... scheduler is run on every interrupt and one of a number ... map if the program is non-trivial. Here's an example ... -
A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... /> Do you mean support for non-standard Spectrum models, such as ... visual glitches even if the interrupt occurs when the CPU is ... -
Getting aquainted with the IF1bisToday, fifteen days after dispatch, the IF1bis arrived at my door. In perfect order. No customs, no TVA and no handling fee involved. The arrival of …
... we only could extend the Maskable Interupt routine in ROM.... On ... scan routine that runs every Interrupt, is extended with a test ... is decreased by 1 every Interrupt. When the counter reaches zero ... -
Beepola v1.08 AvailableA new version of Beepoa, v1.08, is now available for download from:- [url]http://freestuff.grok.co.uk/beepola/[/url] (1.76MB zipped exe, no installe…
... the pitch errors are actually non-linear (high frequencies will be ... to be a change in interrupt as well as clock speed ... -
Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…
... knowledge of digital components is non-existent.
I understand ... not inadvertently respond during an interrupt (the Z80 CPU drives /M1 ... it is responding to an interrupt).
Some of the ... -
A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... : Computer will crash if an interrupt occurs during execution!"
as ... images move around. If an interrupt happened while executing them, players ... different. They are intended for non-frequent use, such as drawing ... -
Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... request as long as the non-border screen area is being ... cycle 17988 after ULA generates interrupt, and change every 4 T ... -
FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... its I/O is not interrupt driven. The same limitation applies ... would allow use of an interrupt handler to drive the serial ... writing, in that it uses non-blocking mode for transmitting, but ... -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... caused the game to be non-completable.
So that ... /> Going USR0 will disable that interrupt and that byte will remain ... -
HALT: Why always 4ts?Instruction breakdown of halt is like that: PC 4ts. That means it fetches instruction byte from ram which tooks 4 ts and then does nothing and read…
... a single instance of their non-repeating counterpart, but with an ... same as N times the non-repeating instruction, but folded into ... copy will happily allow an interrupt routine to cut in halfway ... -
Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... that generates a [i]maskable[/i] interrupt outside the regular screen retrace ... a "false negative" because an interrupt occurred exactly during the first ... -
[Updated] RetroVM 1.0.4 with Recreated ZX Spectrum support.A new version available the change log: - Recreated ZX Spectrum "game mode" keyboard support. - Fix a bug with multiples machines running in para…
... saying you've pressed a non-ascii key [ 10111111)
jr ... the part that needs the interrupt to run to get the ... code as it is the interrupt routine that converts key press ... -
I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…
... go into interrupt mode 2 and intercept the maskable interrupts before calling ... -
I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…
... go into interrupt mode 2 and intercept the maskable interrupts before calling ... -
Why doesnt this work???Simple piece of code wont do as it should, just want to fill the top 22 lines of screen with an attribute value (150) but it wont have any of it. Som…
... ~0.2416% which is near non-existent.
[ ... real work in an interrupt routine. I've seen ... also doing it in his interrupt routine. So on those ... was screwed up by the interrupt routine multiply.
non-critical code it may ...
