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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…
Instruction breakdown of halt is like that:
... or interrupt.
if halt is already read by cpu ... and again to execute the HALT, why it still takes 4 ... /> I mean if cpu executed HALT at cycle 5, and if ... -
Playing AY music on the SpeccyCan anyone help with playing AY ripped music on the Speccy? So, let's say I want to play some ripped AY music, such as: [url]ftp://ftp.worldofspect…
... the routine, then call the data in tra_0_2.BIN per HALT command ...
EI
LOOP:
HALT
CALL 51802
JR ... -
z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…
... setxy - this calls the setxy routine
ld a,'*' - ... - this calls the setxy routine
ld a,32 ... halt ??
djnz delay0 ??
ret - returns to the main routine ... -
Rom routine for pixel addressDear all, Having my bi-annual 'lets try machine code' project again and have come up with a problem with the pixel address rom routine at 8874. …
... with the pixel address rom routine at 8874.
Going ... be holding 128 after the routine is run?
Tobo -
im looking for a basic routine that adds a numerical character to a stringim looking for a basic routine that adds a numerical character to a string. so a=1, "1", then a=0 "10", then a=1 "101......" and so on
im looking for a basic routine that adds a numerical character to a string. so a=1, "1", then a=0 "10", then a=1 "101......" and so on -
Chompston Mazes in SpecBASAfter the discussion in ASH-II's Pacman thread, I checked out the link there about generating 2D Pacman style mazes. This one was quite good fun, …
After the discussion in ASH-II's Pacman thread, I checked out the link there about generating 2D Pacman style mazes.
This one was quite good fun, and can form the basis for a number of game types, one of which being [url=http://www. ... -
Help With AY Music Program in BASICHi, last year I started writing a BASIC program for making and recording AY Music. I thought it would be easier than learning how to use Soundtracker…
... USR "q"+x,y: REM Pause Symbol
186 NEXT x ... not used within the recording routine **
1258 REM ** doubling ... pressed go to the playback routine.
2070 IF INKEY ... 2121 IF INKEY$="r" THEN PAUSE 5: LET k=k+1 ... gt;0 AND k6 THEN PAUSE 5: LET k=0< ... -
WANTED Machinecode Routine for Paging in Betadisk TR-DOS v5 ROMI try to build a small MCode-program which writes the TR-DOS-ROM v4 / v5 to RAM adress 40000 an up. It´s working on TR-DOS v4 / Betadisk 48k: C…
128k Paging a tile routine to a double bufferHi happy new year all :) Does anyone have an example of how to page a routine to the screen ie a tile routine? Thanks :)
Hi happy new year all :)
Does anyone have an example of how to page a routine to the screen ie a tile routine?
Thanks :)Variable sized tiles /tile routineHow would you do a variable sized tile routine where the tiles have position variables too? Thanks would be interested to learn :)
How would you do a variable sized tile routine where the tiles have position variables too?
Thanks would be interested to learn :)Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…
... was testing this text scroll routine taken from Jonathan Cauldwell's ... /> JR NZ, L_35381
L_35387: HALT
CALL 00654
INC ...I don't think I'm getting the $22AA Pixel-Add rom routineDear all, I'm misunderstanding how the PIXEL-ADD rom routine works. My code... [code]ld b,175 ld c,1 call $22AA ld (hl),a ret[/code] So…
... how the PIXEL-ADD rom routine works.
My code ... , I'm assuming the rom routine at $22AA will convert the ..."Decoding z80 Opcodes" (http://www.z80.info/decoding.htm#intro) - Incorrect HALT Opcode?Apologies if this is a dupe but I searched within the forums and couldn't find anything. I've been working on a z80 emulator (for academic and rec…
... seems to incorrectly specify a HALT opcode as 0x7[i]7 ...Interrupt routineI have been trying to create an interrupt routine for playing AY music in the background but cant seem to get anything working. I have a music rou…
... trying to create an interrupt routine for playing AY music in ... />
I have a music routine in bank 6 that plays ...Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…
... Jon Ritman's random number routine, published in Your Sinclair Aug ... and VARS areas, this small routine can be merged into programs ...
9994 PAUSE 1+INT (RND*50): REM test routine here
9995 NEXT a
9996 GO SUB 9998: PAUSE ...A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
... speed) real-time sprite shifting routine for sprites that are one ... sets again.
(The routine is shared between two sprites ...Interupt service routinehas anyone set up a interupt service routing with pasmo? this one I tried resets the speccy EDIt- I placed the code after the END directive, I fi…
... 65024
; pointers To interrupt routine.
defb 200
defb ...SpecBAS 0.900 ReleasedAgainst my better judgement, here's 0.900. It's got lots and lots new, but mostly the new shiny is the editor. You can indent your code, you can e…
... curve algorithm for the CURVE routine - demo "ultraviolet" looks a lot ... bug in clipping rectangles Fixed PAUSE and WAIT.
Fix issues ...im looking for a horizontal scroll routinehi, im looking for a horizontal scroll routine. i read somewhere that you can do it with at 'to' statement, somewhere in a print routine. althoug…
... looking for a horizontal scroll routine. i read somewhere that you ... ' statement, somewhere in a print routine. although i am open to ...Key repeat weirdness with EI & IYI finally (after 35 years!) decided to write something a) for 48k speccy b) in z80 assembler. It's been over 20 years since I've written anything in …
... I created was a routine that draws 16x16 sprites ... be the slowest sprite routine ever but it works ... of that I use HALT instruction to wait for ... vertical retrace. And HALT does not seem to ... wait for vertical retrace without HALT & EI?
...High score table routineI wrote this general purpose high score table routine. It stores 5 scores and displays them alongside the player names, which are 8 characters long. …
... general purpose high score table routine. It stores 5 scores and ... /> RET ; exits the routine
PRINTNUM: ; routine by J. Cauldwell
A SAVE routine to reduce Microdrive loading timesHello! Please i'd like to know if there is a SAVE routine written to reduce the zx microdrives loading times.
Hello!
Please i'd like to know if there is a SAVE routine written to reduce the zx microdrives loading times.No-tearing (“vsync”) Full Screen FadeSeeing as most screen fades exhibit visible tearing, I wrote my own routine which does away with that problem. Simple, effective, short, and fully re…
... tearing, I wrote my own routine which does away with that ... of attr area
halt ;wait for beginning of frame ... minimum for a custom IM2 routine
1$ dec de ;until ...Machine code routine neededHello! Please i'm looking for a short routine that can write the same value in a range of continous memory locations. For example, to write 255 val…
Hello!
Please i'm looking for a short routine that can write the same value in a range of continous memory locations.
For example, to write 255 value from location 40000 to 41000.
Many thanks in advance.looking for a vertical scrolling routinein basic or like the standard scroll? routine but the other way round with the scroll? removed (this would have to be in code). ive tried a couple of…
... or like the standard scroll? routine but the other way round ...im looking for a machine code star-field routineim looking for a machine code star-field routine. preferably with mnemonics.
im looking for a machine code star-field routine. preferably with mnemonics.Passing parameter from BASIC to assembler routineWas there a "clean" way of passing parameter(s) from a BASIC program to an assembler routine? Something like parameterising RANDOMIZE USR call? I fac…
... BASIC program to an assembler routine? Something like parameterising RANDOMIZE USR ...
