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InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
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* An interrupt cannot occur immediately after an ... * M1: 7 tstates: acknowledge interrupt and decrement SP.
* ... * M1: 6 tstates: acknowledge interrupt and decrement SP.
* ... a retriggered interrupt.
Non-maskable interrupt (NMI)
Game loop design?Having some thoughts on how to design the game loop and could do with some hints and tips from folks who have done it before! It's all about how to …
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halt ;Wait for interrupt
call drawsproffscr ;Draw offscreen ... synchronized with the IM2 interrupt when the sprite has ... be synchronized with the interrupt no matter if the ... the main game loop, interrupt synchronization and whether I ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... was only one kind of interrupt, the 50Hz screen refresh one ...100s of games for sale!Dear All In preparation for a move to Manchester, I wish to get rid of the following games as a job lot! The list below should be pretty accurate, …
... ) ?1, Impossaball (Hewson) ?2, Incredible Shrinking Fireman (Mastertronic) ?1, Indoor Sports ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... /> It waits till the next interrupt (HALT) so that it is ... />
RET
;PREPARES INTERRUPT HANDLING
INITIM2:
RETI
; **** END INTERRUPT ROUTINE ***
WRITECHAR ...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... TO 1
Every Interrupt that's fired (1/50 ... /> RET
;PREPARES INTERRUPT HANDLING
INITIM2:
RETI
; **** END INTERRUPT ROUTINE ***
WRITECHAR ...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…
When 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 interrupt but how can I tell if the ULA is now past the border and onto the screen?The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…
In this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes.
[url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=1127&forum=4"]http://www.worldofspectrum.org/forums/viewtopic.php?topic=1127 ...How can I see how long it took for IM2 to runHow can i see how many cycles it took for my interrupt routine to run, is there some way with Spectaculator debugger etc to see how long it has taken…
How can i see how many cycles it took for my interrupt routine to run, is there some way with Spectaculator debugger etc to see how long it has taken from entering the IM2 routine to RETIANN: Tipshop updated Monday, 31 January 2005Monday 31 January 2005 A dose of Chickenpox meant I FINALLY had time to put this update online. And very good it is, too.. The update, not the Chicke…
... Hawk ,
Ikari Warriors , Incredible Shrinking Fireman ,
Indiana Jones and ...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…
... 224 T states. After an interrupt occurs, 64 line times pass ... are the 24 tstates the interrupt?
3) Skipping ahead ...Flicker on my scrolling demo, any ideas?I have created a scrolling demo downloadable from [url="http://www.peargames.co.uk/downloads/scroll.z80"]http://www.peargames.co.uk/downloads/scroll.…
... manipulation, and runs at every interrupt, and takes 1/25 second ...FrameSyncIt was many many years ago since i programmed assembly on the spectrum but I just picked it up again for fun. Now this is one thing I can't remember…
... using the NMI or other interrupt source. I can't remember ...Selling off my old Speccy games...Hey! I've moved house and as such all old crap I don't use needs to be shifted etc etc etc blah blah blah I've got some games fully cased with inla…
... Sim - no case
Incredible Shrinking Fireman - poor cond and recorded ...Lost for WordsWhen you are lost for words then this Euphemism Generator may be the thing you need [url="http://walkingdead.net/perl/euphemism"]http://walkingdead.…
... as I find that they interrupt the flow of the rappin ...Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …
... I redirect the vertical blank interrupt so it points as my ...two areas of display[quote]Since Timex and ZX Spectrum 128K have two areas from which the screen can be displayed, there's a possibility to switch the areas at every fra…
... the areas at every frame interrupt (50Hz).[/quote]
I ...Rst #38This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode…
The BASIC ISRFirst of all, excuse me if my blatant ignorance about this topic makes me write some nonsense :) The thing is that I'm finishing a game in mixed BAS…
... best solution is having an interrupt service routine which calls the ...Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…
... be calling +3DOS and running interrupt code here, so i think ...Help with creating .ayI am trying to create an .AY file for Sidewalk. Now this is the first time I am trying to do anything like this, so please bear with me. Using Spin's…
... to make sure a correct interrupt handler is called and sets ... =0
INIT=#c5fc
INTERRUPT=#cf7d
SongLength=65535
Musician WantedI am looking for an ay musician for a game being written now. The project is far enough along that this is probably a good time to start on the musi…
... with the player in the interrupt routine, let me know!LiberatedI was just browsing around at "stuff" and spotted the [URL=http://www.worldofspectrum.org/infoseekid.cgi?id=1000227]Liberator[/URL], a hardware wotsi…
... was it perhaps a hardware interrupt that was triggered at different ...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 the Z80 can generate interrupt for the first time at ...50Hz on PC?Hi, do you know of any emulator for PC that can switch monitor refresh rate to 50Hz or closest possible and sync ZX interrupt with monitor refresh?…
Spectrum ethernet... step 1.1Yeah, a tenth of a step :-) Here's the W5100 board up and WORKING: [url]http://www.alioth.net/tmp/w5100-online.jpg[/url] This is called the "Get Th…
... can be used as an interrupt controller, and it has a ...Multi-tasking OS on the Spectrum?Do you think it is possible to build a multi-tasking operating system on the Spectrum? That is, most important the ability to have several task run…
... uses some kind of timed interrupt to get back control from ...It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…
... *our* device has caused an interrupt (otherwise ignored)
- 0x0066 - only ...
