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IM 2 interrupts and smooth scrolling - easy peasy!Okay, been fiddling around with IM 2 and have actually mastered (I think) how to use IM 2! Now I run my game Ragnar Revival in IM2 and use HALT to sy…
... start
;a test interrupt function located
;at 35002 ... Basic
;prepares interrupt handling
prepint
ld ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
...
* 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 …
... />
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 ...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?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 RETIFavourite thing about the SpectrumWhat was/ or is your favourite thing/s about the Spectrum? Is it the soundchip of your favoured/owned machine, be it 48K beeper, or 128 AY the shee…
fzx32 on GP32 progressing nicelyJust to let you know that Rlyeh is working hard on his ZX Spectrum emulator fZX32 for the GP32 and should be released in the near future. Its based…
... with sound (both AY and Beeper) and no frameskip and currently ...BASin Release 11 out nowBASin has been updated once again, for your BASIC programming pleasure! Get it at: [url="http://homepage.ntlworld.com/paul.dunn4/BASin_r11.exe"]htt…
... follows:
Added - Sound! Beeper/Port $FE Sampling only atm ...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 ...QL repairI have a QL with a memory expansion. It's keyboard membrane is knackered and when switched on screen corruption flickers all over the place and the b…
... over the place and the beeper beeps sporadically along with the ...Saving BASIC code as CODE... can't start programHi guys! I'm trying to create an adventure game for the Speccy in BASIC, called The Legend Of The Red Dragon. I'm using the excellent BASin to code…
... , game over screen with beeper music, and beeper music for the start ...Internal speaker vs TVThere is a real difference in the way the BEEPer sounds when coming out the little internal speaker as opposed to the television. As we all know, the…
... difference in the way the BEEPer sounds when coming out the ...ANNOUNCE: BASin Release 12 ready for downloadWell, after a rather large break, BASin's latest incarnation is ready for public use. Probably. BASin is a Sinclair Spectrum development environme…
... and PCkeyboard support
Full BEEPER sound and port $FE emulation ...ANNOUNCE: BASin Release 12 ready for downloadWell, after a rather large break, BASin's latest incarnation is ready for public use. Probably. BASin is a Sinclair Spectrum development environme…
... and PCkeyboard support
Full BEEPER sound and port $FE emulation ...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 ...Loading tunes possible?Ever since I first saw the pacman load-a-game loader by Andy Severn on Joe Blade 2, I`ve wondered if it were possible to have loading tunes. Would i…
... lower the volume of the beeper loading noise during loading, and ...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 ...Speccy music podcast show - tune requests?Greetings Spec-chums! I've recently released my first ever retro music podcast and as it was so well received I've starting planning future shows. …
... music (both from the 48K beeper and 128K tunes). Does anyone ...Why are there no Speccy tune remixe(r)s?In the past, I made a couple of posts on this boards which hinted at the whole SLAY Radio/remix.kwed/C64 audio thingy which is mostly breadbox relate…
... all know the Speccy's beeper did not exactly make people ...rubber troublejus got 48K rubber speccy into my possesion, which was my first computer back then but only for few months before daddy decided to upgrade it for 48+…
... 48+ it?s not needed, beeper plays anything which is played ...Bipboi Progress[b]UPDATED With Bip0708[/b] Hi, It's been a while since Micro Mart mentioned my game I've been working on, "Bipboi", and frankly it's been a while …
zxboy emulatorCan anyone tell me if this is worth getting, and from what I hear it only emulates the 48k beeper sound not the 3 channel ay chip on the 128k, so is …
... it only emulates the 48k beeper sound not the 3 channel ...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 ...
