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Best way to codeHi, I've been using Zeus Assembler to code MC programs so far. Nothing fancy just the odd scroll left or animation stuff. Wot I'd like to know is, …
... without changing the registers. This mode will always go to ... must fill a table of 257 adresses with a chosen value.< ... make your intrupt adress. This intruptadress is constructed of the ... 0
. LOOP LD (HL),#F1 ; Intrupt routine at #F1F1
ScrollingBit of a daft topic but anyway... Which game had the best scrolling? I would have to volunteer Commando and its silky-smooth scrolling. A particula…
... /> ld bc,020h ; rather than loop with the last ld bc instruction ... attribute map
jr nz,loop ; we've not so go ... have so stop
; this routine will place the first 32 ... can do this with something like:
; ld a,8
; and a,a - x2 ...TAP files for the TS 2068Hi, just recently bought a TS 2068 and found "Taper" on the web. Downloaded it and began to use it only to discover that it would not open TS 2068 fi…
... you could have a high resolution mode (512x192) with fixed attributes for the ... .timexsinclair.org/images/TS2068Keyboard.jpg"]This URL shows it.[/url]
a ROM routine or function. Other improvements ...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…
... "Color Draw" (B2SP has also a fixed Color Draw export now), and ... screens, and replace it with a LDIR copy-routine which will copy the ... around 8 times (and this was with 128 pixel wide playing area ...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…
... . the idea is to do this with 2 screens, and at "only ... "Color Draw" (B2SP has also a fixed Color Draw export now), and ... screens, and replace it with a LDIR copy-routine which will copy the ... around 8 times (and this was with 128 pixel wide playing area ...Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…
... four fixed entry points in the first 256 bytes of memory. This ... interrupt service routine you should reenable interrupts. ISRs end with a 'reti' ... doesn't matter as its a fixed time and won't ... Hz rate with a 4-25 cycle jitter on each interrupt. This jitter ...Z80 coders compoIf you're interested in Z80 coders compo, visit my page [url="http://mbr.nm.ru/compo.html"]http://mbr.nm.ru/compo.html[/url]
... do a loop (infact I tested it from BASIC to do this and ... interesting use of placing the routine at a specific point to make ... ass to try and do with shifts. Hence I and others ... to just count.
[ This Message was edited by: cyborg ...Spectrum 128 Graphics - A missed opportunity?The Spectrum 128 is my favourite model of the Spectrum - the pinnacle of the Sinclair miracle before it was hijacked by Amstrad. But I can't help thi…
... techy stuff, I just copied this out of '50 tips for ... after running the routine is a character sqaure containing a new colour.By ... the INK colour with a simple FOR NEXT counting loop you can cycle ...Game Editor questionI'm currently updating my image utility - TommyGun and my old Map editor, which I haven't released on WoS yet. My question is this. Would people li…
... /> ld hl,0
loop:
djnz loop
...
ret< ... program. If the library routine itself contains more LIB declarations ... into a scattered memory map, but this is only a patch on a ... from other 64K pieces. With segments, you could identify ...whats your second favourite retro computerOk i'm going to assume that for most of us here the speccy is our favourite number 1 retro computer,its the best home computer in the world etc etc :…
... ... =-)
Actually, this could prove interesting; roughly how ... i've got a few unrolled loop routines that move about ... approximately 5714 bytes in a frame using this routine, not counting memory ... z80 look better with these figures) ie a 1MHz 6502 ...An MC question (sorry, there's no MC forum to post to!)Ok, still struggling with learning MC - but am getting there. I just can't find anywhere on the web / in books that explains how to do arrays in MC.…
... />
Other 8-bit processors with indexing ability do it more ... an offset in a register and this gets added to a fixed base address ... opposite way: the offset is fixed and the base address is ... just about all the sprite routine variants I've tried, ix ...COVOX works?My Sprinter "simulates" a COVOX soundcard at port 4Fh, but I don't know how to use it! Can anyone explain to me the process of programming it? (To be…
... i suppose this the thing how works the sound routine from Cobra ... 'd guess they've taken a fixed length of time, sliced it ... we drive it with a high frequency carrier like a 12-16kHz perfect ... output circuit.
Anyway, this perfect square wave is driving ...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 …
... displayed before continuing but this will have a severe impact on the ... is an IM2 routine that contains your main game loop - it is ... then that routine should be called (after reenabling interupts) with a copy of ...need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... C,A
ADD A,A
LD H,C0H ;table with preshifted ... /> ADD A,A
ADD A,B0H ;there is a table with all bytes ... DRAWMID POP BC ;this part of the routine is a loop
LD L ... are
LD A,(DE) ;ORed with the left side of ...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] ; ***********…
... read from the table, is this what you mean, only ... . I saw the AChar routine and assumed it was calculating ... character is a waste. Replacing PChar with a routine to print a Char row with clipping should ... as you have to deal with the screen thirds issue. ...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 …
... into why other games run with a zero flip-flop):
loop:
ld a, (hl)
xor 255 ; mark this screen location ... z, loop
jr repeat
; interrupt routine
; it ...Anyone know the address mappings...of the hardware resources on the speccy; From the screen display address range to all the hardware control registers. etc. Where can I get access t…
... speed optimisation, it contains a routine for doing sprites from ... 16
Returns with A holding number of sprite collided ... BC
DJNZ CDLOOP ;Loop back and check again
Derek
[ This Message was edited by: dmsmith ...Smooth Screen ScrollingHi Everyone, Any suggestions on what is the best way to do horizontal scrolling ie. in Zynaps fashion. I am working on a routine at the moment, whi…
... simplest way to do this would be with a routine like this:
ld ... .
dec bc ; loop counter.
ld a,b ; high byte of ... the loop. What's more, the routine is now down to a reasonable ...Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…
... about 50% of full volume. With a duty cycle of 0.25 ... does not sit still at a fixed position determined by the duty ... distinct levels using my routine, or effectively a log2(90) = 6.5 ... a higher DAC resolution by using a lower sample frequency, but this is a ...Treachery does anyone have the game map for 'treachery' it was a type in of issue 29 of C&VG I believe it was written by Mike 'lords of Midnight' Singleton a…
... />
Did anyone ever get this game working?? Problems I had ... distance table and replacing it with a recursive machine-code routine (which was only ... a couple of hundred bytes ...New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... . At switch-on, this has a value of 64. This can be altered ... printed is fixed and in ROM, you may end up with garbage ... you would end a program with POKE 23610,3. This would not work ... calling a few GOSUBs with no matching RETURNs and watch this point down ...ArmalyteI am sure a lot of folks here remember Armalyte, the fabulous C64 shoot-em-up that almost came out on the speccy. I think there was a demo on some of…
... actual game code, as the loop is in BASIC.
Q,A,O,P to move cursor ... a flag that is built into the scrolling routine which tells the routine ... is the routine does not have to OR this tile with the previous ...how do i read the keyboard in assembly? here is the code i tried writting to find out the value of a key call 28f (hex) loop: ld a,255 cp e jr z loop ld (50000),e ret notes from what i …
... a loop if nothing was pressed the first time.
This ... should do the trick:
loop call 654 ... /> inc e
jr z,loop
[/quote]
with that routine, i will attempt to make a moveable ...Pocket Clive - 2 QuestionsHello, I've just started using Pocket Clive on my iPaq pocket PC, excellent emulator BTW. 1. I have just wrote a small BASIC program to randomly pi…
... to put together a small and incredibly simple routine which solves the ... will be incremented every 20ms. This implies
that the ... , then the RANDOMIZE statement with no parameters will cause the ... z80 (The problem is now fixed for all practical purposes)
Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …
... else go to this address loop), but the loop isnt touching the B ... to zero (50546-50549)
A = fixed background pattern that is
loop,
HL = buffer addr + width, with DE=
with register I=47665/256=186 ...Timex 80 column display driverI subsequently wrote an 80 column font driver for 512x192 mode.
... />
Actually I think this routine, even with the shifting, is faster :D ... from scratch, doesn't compute a new position subroutine address for ... think you can park a number of fixed-time subroutines into the ... can probably be run in fixed-time and make use of ...z88dkHello. I'm an spanish user of spectrum (and naturaly of this page). I have a question. I want to start to program games with z88dk, but I need a goo…
... into a code file in the right place and replacing the ... hand with this. Actually maybe I can add a source file with the ... called a feature request, sorry :smile: The output routine really ... these things could be done with a really flexible output filter, ...Basic or Machine code?Hopefully the correct area of the site to post this question. Anyways, I have got hold of several books on programming my spectrum, and I was wonderi…
... multiple problems - but I fixed them with trial and error last night ... ,a
ld a,7
ld c,a
loop ld a ... the hell - my first real routine! :D
Thanks for ...How to speed up TZX loading (emu development)With many newer emulators there are options to do faster loading schemes, even for turbo-loader or protected loader blocks in TZX files. For example,…
... get a match, you can then move onto the generic loop-shortcut routine ... come across a particularly funky keyboard reading routine.
This method of ... />
You'll end up with a few (up to 15 or ... to optimise and tweak the loop-shortcut, and we got 8 ...Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... />
In my routine I have to loop through this whole thing, doing ... , afterwards) is not necessary with srl a, but I guess IS necessary ... , I have a question about your second suggested routine.( I have not ...
