-
A.C.E. covertapesHello all, just found 2 covertapes that seem to not be archived or documented in any way. The first is Gift from the Gods (Sinclair Spectrum) & Blue …
... Max (C64/128) - Free with A.C.E. Issue 1. The second one ... ; CPC464, stated as free with A.C.E. July 1988. Do these need ... -
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 …
... L,A
LD E,A
LD A,(HL)
OR C
LD L,A
C,A
LD A,L
EX AF,AF
LD L,A
LD E,A ... -
Urgent Help needed to fix this: calling all machine code gurusI am currently trying to write tutorials on the amazing Orfeus music composer by Proxima which allows you to do multi channel music through the beepe…
... a,e
ld a,l
adc a,e
sub c
adc a,e
and c ...
adc a,e ... l,a
and c
inc a
ld h,a
ld a,e
checksum routine from Space GunThis routine starts off with HL=$ffff and a file header read from tape, for each byte of which in turn it assigns to A and calls this routine, ending…
... /> LD E,A : LD A,L : XOR B :
LD H,A : LD A,E : XOR C : AND ... $0f :
LD C,A : RLA : RLA ... E
LD H,A : LD A,B : RLA : XOR D : OR C
LD L,A : RET ...How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…
... DE
LD A,L
ADD A,C
LD L,A
LD E,L
INC DE
LD A,L
SUB E
LD L,A
...Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
... address
add a, l
ld l, a
ld e,(hl)
inc ... ld a,l
add a, c ;get x offset from c
ld l, a
Happy New Year, Gilby!A new year, a new age. How time lies.
Gilby! Yippee, Its Ya Birthday Mahhhn!
:) C E L E B R A T I O N S ! :)Print text in assemblyHello, a perhaps simple question: I would like to print a text string on the screen and I wonder how to do that in the most easy way? I seem to re…
...
LD D,A
LD E,L
LD A,(ATTR)
LD ...
RRCA
ADD A,C
LD L,A
LD (PRTPOS),HL ...Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... SPRINT
PRINTA LD L,A
LD H,0
RRCA
ADD A,C
LD L,A
LD (PRTPOS),HL ... $58
LD D,A
LD E,L
RET
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... maros.pri.ee/eng/authors/e/einar/o-mundo-perdido/"] ... ld h,$c0
ld c,a
[/CODE]
to ... de
ld a,l
or c
ld l,a ; now HL= ... 010RR000rrrccccc
next_line:
ld a ...Struggling with this routine... Any ideas?I'm trying to write a routine that plots 3 pixels to decrease the energy bar in the top right corner by 5 units, but it just wont have it! There mus…
... = ATTRIBUTE FILE ADDRESS
a = ATTR(b,c)
DF-CC IS ...
add a,c
ld l,a
ld e,a
ld a,(de)
ENTRY a = CHARACTER CODE
PRESERVED c
EXIT b ... 38H
PRINT1 ld l,a
ld h,0
That painter thing..I'm struggling to think of a non clunky way of detecting when a 'box' has been surrounded and can be highlighted, like in the pic: [IMG]http://i1142…
... br /> rra
ld e,a
add ... a,(ix+7) ;A =BotR:col
sub c ; -TopL:col
ld e,a ;E ...
or c
ld l,a
ld a,h
...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... 8x8 pixel blocks - either a space or a wall - based on the ... ; if not 0 (i.e. 1), it's a wall
ld a,(tile_y)
inc a
ld (tile_y),a ; next line ...
rrca
add a,c
ld l,a
ret
Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... - each tile has a particular colour stored with ... a
sra a
sra a
add a,88
ld h,a ...
ld a ... rrca
add a,c
ld l,a
ret[/code ... the tile - i.e. the one representing its ...Mirror tableCan anyone help with a byte mirror table? e.g. so you can look up a byte of a left-facing sprite and return the correct right-facing value. There …
... c,e
ld a,(bc)
ld (hl),a
dec l
ld c ... ,d
ld a,( ... bc)
ld (hl),a ...
dec l ... ld b,8
ld a,l
.l1
...Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
... winded compared to a high level language e.g. using 8 ...
rrca
add a,c
ld l,a
ret
; ...Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
... inc h ; Add 256 i.e. next pixel row
djnz ...
rrca
add a,c
ld l,a
ret
; ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... - A, S, D, F, & G
; #FB - Q, W, E, R ... onto it
add c
ld l, a
; B = loop counter ... onto it
add c
ld l, a
; B = loop ... /> ld d, h
ld e, l
jp sprite8x8caAlwaysLookupRow
.notaligned ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... - A, S, D, F, & G
; #FB - Q, W, E, R ... onto it
add c
ld l, a
; B = loop counter ... onto it
add c
ld l, a
; B = loop ... /> ld d, h
ld e, l
jp sprite8x8caAlwaysLookupRow
.notaligned ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
...
; c column
;
sprite8x8a:
; zero A
xor a
a 256 byte boundary
... the table
ld a, (hl)
inc l ; this won't ... onto it
add c
ld l, a
ld b, 8 ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... ), a
inc e
inc l
ld a, (de)
ld (hl), a ...
; e won ... onto it
add c
ld l, a
djnz .loop
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... inc l
ld a, (de)
ld (hl), a
inc e ; e won ... onto it
add c
ld l, a
; unroll loop ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... onto it
add c
ld l, a
; B = ... ld d, h
ld e, l
jp sprite8x8caAlwaysLookupRow
. ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... onto it
add c
ld l, a
; B = ... ld d, h
ld e, l
jp sprite8x8caAlwaysLookupRow
. ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... ld d, h
ld e, l
jp sprite8x8caAlwaysLookupRow
... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... it
add c
ld l, a
xor a
; ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... pushes
ld h, a
ld l, a
.attribloop
ld a, (hl)
ld e, a
ld d, ... h, d
ld l, e
add hl, hl< ... ld b,d
ld c,e
push bc
... ld b, d
ld c, e
push bc
...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... br /> ld e, (ix+3) ; e = row (y)
sla e ; e = row* ... of char
ld e, (hl) ; e = low byte of screen ... d, 0
ld e, (ix+2) ; e = col
add ... ld b, 8
ld e, (ix)
ld d, ( ... onto it
add c
ld l, a
ld b, ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... br /> ld e, (ix+3) ; e = row (y)
sla e ; e = row* ... of char
ld e, (hl) ; e = low byte of screen ... d, 0
ld e, (ix+2) ; e = col
add ... ld b, 8
ld e, (ix)
ld d, ( ... onto it
add c
ld l, a
ld b, ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... e, a
srl l
srl l
srl l
ld c, l
ld l ... e, a
srl l
srl l
srl l
ld c, l
ld l ... it
add c
ld l, a
djnz .loop ... it
add c
ldHow to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... ld d, h
ld e, l
jp sprite8x8caAlwaysLookupRow
... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... it
add c
ld l, a
xor a
; ...
