-
Strider II (and others) + 3 disk versionsHello everyone, I've been working on converting some games to be able to load them from the +3 floppy. I started with single load games but now Im i…
... /> call paging
ld hl, 0
ld de, 0
call DOS_EST_1346 ... /> openfile
LD HL, filename ; file name
LD DE, 2 ; E=2 ... /> destadd LD HL, 0 ;dest addr
blocklg ld de, 0 ;lenght
ld BC ... -
Full 16*16-digit BASIC multiplicationI liked Andre Adrian's 32-bit long multiplication routine so much that I decided to a decimal version. After all, 2^63 is only 9223372036854775808, a…
... REM EXX
1060 : REM LD A,B ; MPR IS B ... 1070 LET A=17 : REM LD B,33 ; INITIALIZE LOOP ... LET I=0 : REM ADD HL,DE ; RESULT += MPD
... I=0 : REM ADC HL,DE
1141 LET L= ... -
30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
... /> LD HL,nn
LD DE,nn
LD BC,nn
EXX
LD HL,nn ...
LD DE,nn ...
LD BC,nn
LD IX,nn
LD ... and 28
LD HL,nn
LD DE,nn
LD BC,nn
Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…
... LD (HL),A ; poke flipped byte
ADD HL,DE ADD HL,DE
ADD IX,DE ... LD (HL),C
LD (IX+0),A
ADD HL,DE
ADD IX,DE ...Routine for Currah speechI'm currently writing a routine for the Currah that will provide speech during a game. A timer is set to initiate the speech every 50 cycles of the …
... ld (tim),a ;reset timer
; ? ? ? ? ? ? ? ?
Start: ld hl, Dat1
ld de ... , 65361
ld b, 15 ;load ... 4
Loop: ld a, (hl)
ld (de), a ;load allophone in ...Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... BC
13 = INC DE
23 = INC HL
[/code]
LD E,
26 = LD H,
2E = LD L,
01 = LD BC ... ,
11 = LD DE,
21 = LD HL,
MC LPRINT 23681Having problems with this routine to print large on the screen using LPRINT, it works ok in BASIC, but cant seem to get it to loop for some reason in…
... /> call cols ;fill attributes
ld hl,72 ;start of address to ... 5633 ;open channel
ld de,dat
ld bc,16
call ... /> cols ld hl,22816 ;random colours
ld b,159
lp2 ld a ... inc a
ld (hl),a
inc hl
djnz lp2
JSW2 - Game Loader DifferencesThere are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it …
There are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it incorporates a built in cheat mode. Feedback on this point is appreciated. To quote the readme:
128 BASIC-compatible way of loading BASIC as code?On a 48K Speccy (or from 48 BASIC or USR 0 mode on a 128K machine), one can do a silly trick like this: [code];; load a 4000 byte BASIC program ld i…
... address of system variables
ld de,4000
call my_loader
ld hl,100
ld (23618),hl
ld a,1 ; statement ... 1
ld (23620),1 ...SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
... /> ld hl,(23680)
ld (23606),hl
jr z,ScrDone
ld a,(de)
hl ;HL=$106E
push hl
push de
push bc
ld de,(23653) ;DE ...LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…
... BC, DE or HL.
unlz4:
ld b,0 ...
push de ; save destination pointer
ld e,(hl) ; read the ... 32767?)
sbc hl,de ; subtract offset from HL (carry is clear)< ...Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…
...
LD HL,16384 ; Beginning of the graphic memory
LD DE,1024 ; ... Loop length
LD B,E ; ... ,loop_high
loop:
LD (HL),62 ; Fill the video memory ... with this number
INC HL
DJNZ loop
...Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... br /> [CODE]
ld hl,SOURCE
ld de,TARGET
ld bc,4096
push de
push hl
ld (dest+1),sp
ld hl,SOURCE-TARGET ... ]:
[CODE]
ld hl,SOURCE
ld de,TARGET
ld bc,4096+128 ...Nasty 'Gotcha' for multicolour timingI thought I would be better developing my multicolour routine on the 48K first, being the slowest, so it would then be sure to work on the 128K varia…
... +2A. I've used LD (nn),HL , then I've used ... prefix byte longer than using HL. There's even a ... duplicate of the command using HL, again with the prefix ... can do LD (nn),IX followed by LD (nn),HL since the ... data) before the next LD(nn),DE or whatever, to get ...z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…
... />
LD BC,255
LD DE,04000h
LD HL,37000
hl
push de
push ix
rst 56
LD ... BC,255
LD DE,04000h
LD HL,37000
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…
... /> ADD HL, HL
ADD HL, HL
ADD HL, HL
LD DE, 22528
ADD HL, DE
LD DE ... , (bv1)
ADD HL, DE ...Simple memory transfer routineI'm looking for a simple memory transfer routine that shifts 32 bytes of data from the address HL is set to 55143, I have tried using LDIR, but cant …
... data from the address HL is set to 55143, ... level number
ld b,a
ld hl,udg-32 ;start ... /> ld b,32 ;8 x 4
loopa inc hl ; ... ld b,32 ;hl should now point to level x 32
ld de ... ,55143 ;de ...Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…
... #2 (screen)
ld de,NBITS
BucConv call ... ShiftBlock
dec de
ld a,d
... proc
ld hl,BCD
BucAdd ld a,(hl)
cp ...A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... br /> ; disable cache
ld de,0
ld hl,128
call dos_set1346 ... file
ld bc,$0501
ld de,$0002
ld hl,fichero
cerrar:
ld b,5
call dos_close ... br /> ; return to BASIC
ld iy,23610 ; restoring iy so ...Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…
...
add hl,de
loop_17:
add hl,hl
ret ...
ld a,e
ex de,hl
; de = 16-bit ... -bit multiplicand DE
; hl = 16-bit multiplicand HL
ld b,d ...Ghosts n' Goblins loaderI'm trying to put Ghosts n' Goblins onto a +3 disk but struggling to understand the mc loader. Basic loader [code] ink 7 : clear 25000 : load "" cod…
... HL, DE
65252: LD SP, HL
65253: POP HL
65254: LD SP, HL
LD (HL), A
65507: LD (HL), A
65508: LD A, B
65509: LD (DE ... : LD (HL), A
65523: LD (HL), A
65524: LD A, B
65525: LD (DEVenturespeak Helplooking at the code from ZX Computing, October, November & December 1986. How do I make the code do more then 3 letters say 5. and could it be made …
... /> 60108 219EEB LD HL,START
60111 1600 LD D,000
HL,DE
60118 77 LD (HL),A
60119 13 INC DE< ... /> 60297 119EEB LD DE,START
60300 3A9CEB LD A,(CT2)
Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... = 49087
ld hl,48640
ld de,48641
ld (hl),191
ld bc,256 ... hl,bc ;hl = row in table
ld e,(hl)
inc hl
ld d,(hl) ;de ... /> ld c,a
ex de,hl
add hl,bc
ex de,hl ;<…JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…
... other words
[code]
LD A,bytetocheck ; Has to be ... 2
LD L,A
LD HL,jumptable
JP (HL) ; read/peek ... the contents of HL and ... jumps to the memory location HL
Looking ...EXX ProblemsWondering if any other coders have had problems using the EXX instruction in FUSE... I am calling the BEEP routine from within my own code and prese…
... ]
EXX
ld hl,497 ;pitch
ld de,10 ;duration
call ... crashes. I commented out the ld, hl ld,de and call, so that the ...SBC IX,DE/BCAlways wondered why there wasn't a SBC IX, DE/BC command.... so have to use PUSH HL ; save original HL PUSH IX ; IX on stack POP HL ; IX …
... wasn't a SBC IX, DE/BC command....
PUSH HL ; save original HL
PUSH IX ; ... into HL
SBC HL,DE ; do calc
PUSH HL ; ... IX
POP HL ; get original HL back again
... at the same time, DE is the value to ...DJNZ displacementHi I had a question about DJNZ operation. Just running through this code in MMCOYZXS by Toni Baker page's 87-88 [QUOTE]21A440 LD HL,40A4 11083F …
... /> [QUOTE]21A440 LD HL,40A4
11083F LD DE,3F08
0608 LD B,08 ...
1A LOOP LD A,(DE)
77 LD (HL),A
ld hl, $40a4
fa03: 11 08 3f ld de, $3f08
fa08: 1a ld a, (de)
fa09: 77 ld (hl), a
fa0a ...byte to screen eventI have another question regarding assembly routine in MMCOYZXS by Toni Baker page's 87-88 [QUOTE]21A440 LD HL,40A4 11083F LD DE,3F08 0608 LD B,08…
... /> [QUOTE]21A440 LD HL,40A4
11083F LD DE,3F08
0608 LD B,08 ...
1A LOOP LD A,(DE)
77 LD (HL),A
ld hl, $40a4
fa03: 11 08 3f ld de, $3f08
fa08: 1a ld a, (de)
fa09: 77 ld (hl), a
fa0a ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
...
ld hl, 25000 ;Start of DB Screen
ld de, 16384 ;Start ... be Field 3
ld de,18432 ;Load de with start of field ...
field3:
ld de,20480 ;Load de with start of field ...Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…
... /> LD HL,01045
DJNZ 65380
DEC HL
LD A ... RRA
LD C,A
INC DE
JR ... DEC DE
EX AF,AF'
LD B,210
LD ... RRA
LD C, A
INC DE
JR 65453 ... DEC DE
EX AF, AF'
LD B, 210
LD ...
