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Multicolour demo using z88dk + BIFROST* (+source)This is just a demo to show how to show multicolour using z88dk, using the BIFROST* engine (more info [URL="http://www.worldofspectrum.org/forums/sho…
... pop bc
pop bc
pop bc
pop bc
pop ...
pop hl
pop de
pop bc
push hl
push bc ; save char **string_ptr + ... only pull in one copy of sp1_initialize so the ... -
Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... service routine and uses POP and PUSH to copy the
contents ... /> [code]; Byte Order Backbuffer - Pop And Push Edition
; Copyright (c ... LDI is faster than POP/PUSH for everything except rainbow ... br /> Btw I've found POP/PUSH to be faster than LDI ... -
Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…
... $2da2 ;FP-TO-BC
push bc
ld ix,16384 ... /> call $2d2b ;STACK-BC
pop bc
bit 5,c ... ,(hl)
ld (de),a ; copy byte
ld (hl),0 ... -
Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…
... number & attribute copy options it also allows ... old att address
push hl
ld a,( ... A =old attributes
push af
bit 0,(ix ... ld (bc),a ;copy attributes
NOATTR: pop de ;DE=old ... -
number padding functionI wrote a number padding function in BASIC a while ago, but when I came to want it again I couldn't find it, so I've done this enhanced [url=http://w…
... br />
GOTDP: push de
pop hl
add hl ... br /> FINDA: push bc
push de
pop hl
cpir ...
pop bc
ret
;copy ... -
SUPER INPUTA couple days ago I searched for an "INPUT string" routine that I could use in Assembly programs and supported multiple lines, but I found none. Thus…
... br /> [CODE]EDIT: push hl
push bc
ld a ... SET_WORK (reset workspace)
pop bc
push bc
inc bc ... jr z,NOTEXT
ldir ;copy initial string to INPUT workspace ... -
Multiply the value of 'a' by 5Is there a way of multiplying the value of 'a' by 5? I've tried 'add a,a' etc. but only get multiples of 2...
... ;639573]Anyway, I guess PUSH HL, POP DE is our best option ... as opposed to 21T for PUSH HL : POP DE . I'll generally ... immediate 16-bit register copy, and PUSH rr : ... : POP rr for a delayed ... copy or a "save until later ... -
64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
... from left-to-right, to copy up a line in segments ... far, which is to POP HL from the source data ... changing SP and doing a PUSH. You can also use ... by using LD instead of POP to fetch the data from ... problem is the fastest operations (PUSH) fill right-to-left when ... -
64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
... LD SP,(CurrentLineAttrs)
POP HL
LD (MV0 ... 256+15
PUSH HL
POP AF
PUSH HL
POP AF
EX ... PUSH IY ;copy MV11
PUSH IX ;copy MV10
PUSH AF ;copy MV9
PUSH BC ;copy ... -
64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
... /> POP AF ;MV9
POP IX ;MV10
POP IY ;MV11
POP ... /> PUSH IY ;copy MV11
PUSH IX ;copy MV10
PUSH AF ;copy MV9
PUSH BC ;copy ... -
Play command on divideHi, i thought I'd have a quick go on divide seeing as i had an afternoon spare.However,i can't seem to get the 'play' command on the screen?. It see…
... code, but I had to copy the assembly; no problem with ... 40300
MIDIOUT PUSH DE
PUSH HL
PUSH BC
L11A3 ... NZ,L11E7
POP BC
POP HL
POP DE
RET ... -
40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... call overshiftscratch ;
pop hl ;
push hl ;
call ... pop bc
djnz nextshift
ret
copytoscratch ;copy ... -
copying between RAM pagesSay I'm storing stuff in RAM pages 0,1,3,4 which gets used in 6,7 (which I am) and I might want to transfer up to 7kb at a time (which I do) and I do…
You could do a copy via the registers, which requires ... fastest means. Adapting an existing POP/PUSH copy routine shouldn't be too ... -
Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... /> ;return score to BASIC
Copy and paste the paragraph above ... /> Insert line 7, then copy and paste the following code ... /> Insert line 26, then copy and paste the following code ... /> pop bc ;retrieve score
pop hl ;retrieve road posn
push hl ... -
Coding for 128kHi all, I wonder if anyone can suggest any useful reading/threads/examples on the fundamentals of 128k coding. Chapter 24 of the +2 manual has prov…
... stack pointer to do a PUSH scroll, you can page in ... the stack pointer and use POP to copy bytes into registers, then ... the stack pointer again and PUSH to write to it. -
What Spectrum projects (Software/Games/Utility)(Hardware)(Others) are you working on?So, basically that :) You dont have to give names or more clues if you dont want to ;) Also, if you are working on more than one, you can tell all of…
... anywhere.
I then POP these four patterns into registers ... and have a series of PUSH instructions to paint the blocks ... 's actually the list of PUSH instructions that describes the layout ... a list of PUSH instructions and I just copy a run of ... -
smooth movement in basicWas trying to figure this out myself but i would like to be pointed in right direction now :-). How do I make something move in Basic without gettin…
... ld hl,(23627) ;VARS
push hl
ld de,(23653 ... /> ldir ;copy by,bx,my,mx to calculator stack
pop bc ... C=sign,my
push bc
push de
call $2307 ... -
Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…
... ,(nn) LD (nn),rr
PUSH rr POP rr
8 ... cc,nn
Block Copy/Etc
--------------
{LD,CP ... -
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... ]
...you can try copy/paste the link below:
Push ix
Pop bc
Ld ... -
MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... :
[code]
PUSH AF+POP AF
PUSH BC+POP BC
LD ... BC,x
LD BC,x+PUSH ... BC+POP BC
EI
copy of the flags register (or ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... ; DE = destination
ldir
pop hl ; restore source address (compressed ... , b
; copy previous sequence
push de ; store destination address ...
