-
Un-PLOTting in the #0 areaHow do I go about un-PLOTting in the bottom 2 lines. I am aware the ROM PLOT routine only works in the top 22 rows, so how would I go about depletin…
... br /> ld a,(cx)
add a,c
ld c,a ;B =y; C = x
ld a,191 ; ... allow full screen depth
sub b ... -
Deterministic random number generatorI'm looking for a random number generator in assembly which, given a seed, the generated sequence is always the same. You change the seed, you get a …
... generator (as required by the C standard, using 16-bit ints ... /> xor h
ld h,a
ld a,d
srl a
xor e ...
ld e,a ... -
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…
... advanced spectrum machine language"
ld a,b ; by David Webb
... B = row, C = column)
add a,64 ; then CALL this routine
ld ... the block at
ld a,b
and 7
... /> 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…
... advanced spectrum machine language"
ld a,b ; by David Webb
... B = row, C = column)
add a,64 ; then CALL this routine
ld ... the block at
ld a,b
and 7
... /> 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…
... advanced spectrum machine language"
ld a,b ; by David Webb
... B = row, C = column)
add a,64 ; then CALL this routine
ld ... the block at
ld a,b
and 7
... /> 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…
... ld a,b
sra a
sra a
sra a
add a,88
ld ... h,a
ld a,b ... /> rrca
add a,c
ld l,a
ret[/code]
ld a,(de) ; get the colour ... -
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…
... /> ld a,b ;
and 248 ; load BC with screen position (B = row, C = ... column)
add a,64 ; then CALL this routine
ld ... the block at
ld a,b
and 7
... rrca
add a,c
ld l,a
ret[/COLOR]
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…
... />
ld bc,(tile_x) ; loads C with column (tile x), B with row ... a
sra a
sra a
add a,88
ld h,a
ld a,b ...
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…
... a
sra a
sra a
add a,88
ld h,a
ld a,b ...
rrca
ld l,a ; low byte.
ld a, c ; add on y ... coordinate.
add a,l ; mix ...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…
... /> ld a,b
and 248
add a,64
ld h,a
ld a,b
a,c
ld l,a
ret
get_screen_attr:
ld a,b
sra a ...
sra a
sra a
add a,88
ld h,
Morkin
March 2014
Development
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…
... /> ld a,b
and 248
add a,64
ld h,a
ld a,b
a,c
ld l,a
ret
get_screen_attr:
ld a,b
sra a ...
sra a
sra a
add a,88
ld h,
alienbanana
March 2014
Development
Routine for handling large scores?[FONT=Calibri][SIZE=3]I want to store various numbers for scores and levels etc. Some of these can be very large so will need to be held in multiple …
... /> ld (hl), a
cp 10
ret c
DoDecTen inc b
ld (hl), a
dec hl
ld a, b
jp ...ccZ80++Here is the url for a new compiler pour all computers with Z80: [url]http://ccz80pp.webcindario.com[/url] It's a beta version, but it's works. If y…
... /> LD HL,16384
LD A,B
ADD A,L
LD L,A
LD A,C ...
LD A,8
ADD A,H
LD H,A
LD A,C
SUB ... :
LD A,16
ADD A,H
LD H,
slenkar
July 2014
Development
Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
... /> ld a,(23677) ;A =x
and %00000111
ld b,a
inc b
ld a,1 ... 3 2 1 0
;= |.B| |..B..| =|..B..| |.....C.....|
; 0 1 0 7 ...Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
... bc
call $2307 ;STK_TO_BC; B,C=ABS y,ABS x; D ... SGN x
ld (23677),bc ;(COORDS)=BC
ld a,b
bit ... 2
ld b,a
inc b
ld a,1
MoveBit:rrca ...llvm-z80 statusFew months ago I read about efforts to produce llvm back-end for the Z80 (even perhaps as part of new z88dk). Any update on that? I found [URL="htt…
... /> ld hl, b
inc hl
ld b, (hl)
ld a, (b)
ld c, a
ld hl, a ...clear a windowed area of the screenHi everyone! Ain't been on here for donkeys, but have recently started messing around with a little game. I'm looking for ideas/opinions on the bes…
... ld e,a ;update the destination lo-byte (rrrccccc)
ld a,b ;A ... =0
adc a,d ;if ... the line
xor %00011000 ;if the segment ...Detecting flash mode inversionsIs is possible to detect with certainty when flashing characters change from normal to inverted and vice-versa?
... XOR A
LD (OLDFRAMESLB),A
LD (FLASHFLAG),A ; Init
;
.CHECKFLASH
LD A ... ,(OLDFRAMESLB) ; Get previous FRAMES low byte
LD B,A
LD A,(FRAMES ... of frame counter
CP B
JR Z,CFEXIT ...Detecting flash mode inversionsIs is possible to detect with certainty when flashing characters change from normal to inverted and vice-versa?
... ),a
jp LINE3
RETURN: ld a,(23680)
ld b,0
ld c,a ...
dec c
RESET: ld de ...Rafaelle CeccoHi all, I've been in contact with Raffaele Cecco of Exolon fame re source code. Unfortunately he doesn't have the original source code any more but…
... .asm"
; =============== S U B R O U T I ...
;UNUSED ?????
; ld a, d
; sub b
; sub 9
; cp 0F1h ; 'с'
; ld a, 0 ...
; ret c
; ld a, e
; sub ...BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…
...
LD A,C ; Get Lo byte
LD (DE),A ; Store the byte ... DE
LD A,B ; Get Hi byte
LD (DE),A ; Store the byte ...A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
As per the issue with [URL="http://www.worldofspectrum.org/forums/showpost.php?p=813876&postcount=147"]BI*FROST and the recent daily builds of z88dk[/URL], some of the macros that access memory locations in NIRVANA will not compile correctly in z88dk.< ...Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... /> ld c,(hl)
LD HL,#16384
LD A,B
ADD A ... ,L
LD L,A
LD A,C ...Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... /> ld c,(hl)
ENDIF
LD HL,#16384
LD A,B
ADD A,L
LD L,A
LD A,C ...Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... /> ld c,(hl)
ENDIF
LD HL,#16384
LD A,B ...
ADD A,L
LD L,A
LD A,C ... /> LD HL,#16384
LD A,B
ADD A,L
LD L,A
LD A,Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... /> LD HL,16384
LD A,B
ADD A,L
LD L,A
LD A,C ... />
LD A,8
ADD A,H
LD H,A
LD A,C
SUB ... />
LD A,16
ADD A,H
Hungarian notation for asm - Yes or No ?There is thing called hungarian notation - https://en.wikipedia.org/wiki/Hungarian_notation Basically it is all about using prefixed indetifier to i…
... table for the shift
;B- nr of lines
LD A,(DE) ;get second part of 1st shifted byte
LD C,A
LD A,(DE)
OR C ;combine 2nd part of ... shifted 2nd mask byte
LD A,(DE)
...[/code]
< ...Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... of
loop:
ld a,2
;code1
ld a,0
;code2 ... loop
;try this
ld a,2
loop:
;code1
xor ... $01 ; the trick is xor logic ...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…
... a
ld a, b
and 7
add a, h
ld h, a
ld a, c ... ld l, a
ld a, b
and 56
add a, a
add a, a ...
