-
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ; prepare for subtraction
sbc hl, hl ; LD HL, 0
exx ; alternate register ... /> sbc hl, hl ; LD HL', 0
exx ; main register set
ld b, 33 ; shift ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... and clear carry flag
ld b, -33 ; set count
... /> ld (hl), e ; store it
dec hl ; second byte
ld (hl), d ... add hl, hl ; multiply
add hl, hl ; HL
add hl, hl ; by
add hl, hl ; ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
...
ld hl, (stkend) ; address of first location to HL
ld (hl), a ; write ... first byte
inc hl ; next location
ld (hl ... nc, l_test_ch ; jump with code 33 to 255
cp 16 ... -
IF EXIST?In MS-DOS scripting, there is an IF EXIST command that lets you check wether a file exists in disk or not. There are any way to check it out from BA…
... buffer (first entry initialised)
HL = Address of filename (wildcards permitted ...
Always:
C DE HL IX corrupt
All other ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
...
.ifdef ROM1
ld c, 33 ; leftmost position in graphics mode ... /> ld hl, (ch_add) ; get ch-add
push hl ; stack it
ld hl, (err_sp ... assignment
ld hl, (x_ptr) ; original ch-add to HL
ld (iy + _x_ptr_h ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ifdef ROM1
ld c, 33 ; left column ( ... br /> ld hl, (curchl) ; HL = output routine address
ld (hl), e ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> po_gr_1:
ld hl, membot ; membot to HL
call po_gr_2 ... /> .ifdef ROM1
ld a, 33 ; new column? (graphics ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... ld hl, (attr_t) ; get temporary attribute and mask
push hl ; stack HL
ld ... ld c, 33 ... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> ld hl, 0 ; clear HL
ld (coords), hl ... ifdef ROM1
ld a, 33 ; reverse
... -
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... hl, hl ; * 8
add hl, hl ; * 16
add hl, hl ; * 32
ld ... -
Troublesome routine, help needed!Having problems with this routine, it basically fires a rocket up the screen, but refuses to detect collisions. I'm using attribute blocks for detect…
... /> call 5633
ld de,rktdat
ld bc,33
call 8252 ... /> LD L, A
ADD HL, HL
ADD HL, HL
ADD HL, HL
ADD HL, HL ...
ADD HL, HL
LD DE ... -
Collision Detection in SP1Hi, Does anyone have a well-documented example of using collision detection in spritelib. I've search WoS and Z88DK forums but no joy. Something wi…
... ; build in the tolerance
ld c,a ; c = width of ... ; build in the tolerance
ld e,a ; e = width of ... ?
.nocollision
ld hl,0
ret nc ; if ... -
mirroring bitsIf I have a string of 1408 bytes, each of which has one bit 'b' set, what's the shortest way of mirroring that string, so that each bit set at positi…
... />
[CODE]
loop ld a, (hl)
add a, a
xxxx
is20 ld a, $04 ; $20->$04
write ld (hl), a ...
next inc hl
djnz loop ... -
Idiots Guide......To machine code, or assembler language...whatever the appropriate term is Basically at this stage I want to fiddle about and try and get used to…
... />
ld hl,_result ; string destination
push hl
ld hl,33 ; max 33 chars, including ... '\0'
push hl
ld hl,_format ... -
+3 Disk drive motorHi, I'm creating a disk file menu selector. I was wondering how to turn off the +3 drive motor and the motor timeout check from Basic (poking the co…
... ]
MotorOff:
LD HL, 23399
SET 3, (HL)
RET
[/code]
And the machine code is: 33 ... -
How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... )
ld a,33
sub c
ld c,a
ld a ... /> ld hl,(23653) ;HL=(STKEND)
dec hl
dec hl
dec hl
ld a,(hl ... -
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... "atdi"CODE 30000,6912
33 STOP
40 ... /> ex de,hl
ld hl,13616
add hl,de
ld a,(hl) ;get ... 32 columns?
push hl
ld hl,0000
and a< ... -
+3 Disk drive motorHi, I'm creating a disk file menu selector. I was wondering how to turn off the +3 drive motor and the motor timeout check from Basic (poking the co…
... ]
MotorOff:
LD HL, 23399
SET 3, (HL)
RET
[/code]
And the machine code is: 33 ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
...
defb $00,$00,$11,$33,$3b,$6f,$5e,$5d,$5f ... /> ld a,(de)
ld (hl),a
djnz bomberprint2
ld hl,$4711 ... /> ld a,(de)
ld (hl),a
djnz bomberprint3
ld hl,$4731 ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... br /> defb $00,$00,$11,$33,$3b,$6f,$5e,$5d,$5f ... /> main:
;cls
ld hl,bomberdata ;bomber graphic loc
REPT 7
ld a,(hl)
ld (de),a
inc ... br /> REPT 7
ld a,(hl)
ld (de),a
inc ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... 3rd line
defb $33,$e6 ; bomber facing north 4th ... de
ld (hl),e
inc l
ld (hl),d
... de
ld (hl),d
dec l
ld (hl),e
... /> ld (hl),d
dec l
ld (hl),e
ld hl,$4731 ... -
Pac-Land: can be coloured?All versions of this game are full coloured, but not the Spectrum version. It has large sprites, but maybe the scroll is too fine to make a coloured …
... (graphics drawing routine)
; LD HL,23936 (33,128,93) ( replaced by CALL ... 2014"
LD HL,9*256+7
LD (27415),HL
LD HL,Text2
CALL 33556
LD HL,22528 ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... line
defb $33,$e6 ; bomber facing north ... loc
ld hl,$4810 ; screen coordinates equivalent to ... on screen display
ld (hl),d ; draw right ... display
ld hl,$4830 ; screen coordinates equivalent ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... /> LD (HL),A
INC DE
INC HL
LD A,(DE)
LD (HL ... /> LD (IX+2),6
LD (IX+32),6
LD (IX+33),3 ...
LD (IX+34),6
Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…
... 8 31
ld b,(hl) inc l out ... 8 31
ld b,(hl) inc l out ... inc de nop 10 33
ld b,(hl) inc l out ... jp c,EXIT 10 33
ld b,(hl) inc l out ...128+2 Help!Today the postie brought me an early Spectrum 128+2, it's a Z70700 Issue 1. Everything seems to be working ok, i.e it boots up and the keyboard work…
... 8
LD HL, 22753 ; 32802 33 225 88
LD DE, 6 ; 32805 ... ; 32906 16 253
LD HL, 23611 ; 32908 33 59 92
RES ...Game of Life.Last year (I think) or maybe the year before, I entered a Game of Life simulator into the CSS CGC compo but for the Sinclair ZX81. I decided to port…
... ld a," "
ld hl,0
ld bc,0
cp (ix-33)< ... br /> adc hl, ... cp (ix+33)
adc hl,bc
ld a,3< ...Game of Life.Last year (I think) or maybe the year before, I entered a Game of Life simulator into the CSS CGC compo but for the Sinclair ZX81. I decided to port…
... /> ld hl,0
ld de,0
ld a,l
cp (ix-33 ... )
adc hl ...Alkatraz Protection System - "How to" and compo?I'm thinking about writing a "how to" regarding the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0020807"]Alkatraz Protection System[/URL].…
... ?p=800147&postcount=33"]Part 2[/URL])
LD HL,TABLE
00090 GETADR LD E,(HL)
00100 INC HL ...Alkatraz Protection System - "How to" and compo?I'm thinking about writing a "how to" regarding the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0020807"]Alkatraz Protection System[/URL].…
... ;
00170 clrscr ld hl,16384
00180 ld de,16385
... 00190 ld bc,6911
00200 ld (hl),a
... php?p=800147&postcount=33"]loader variables[/URL] need ...
