-
Optimization for this codeHello, I have done and submitted a small program for the CSS Crap Game Compo which involves a machine code routine. The z80 with BASIC and MC is av…
... />
ld a, (hl)
inc a
ld (hl),a
... />
ld a, (hl)
inc a
ld (hl),a
... />
ld a, (hl)
inc a
ld (hl),a
jr ... br />
ld hl,text
loop ld a,(hl)
cp 255 ... -
Help needed with simple MCode routineI'm trying to code a routine to clear the screen and I can't figure out why it's not working: ld hl,16384 ld bc, 6144 loop:ld (hl),0 inc hl dec bc l…
... /> ld hl,16384
ld bc, 6144
loop:ld (hl),0
inc hl
dec bc
ld a,b ... -
Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…
... to do with how DEC HL affects the flags?
... ; Port to IN from
LD HL,32767 ; Number of bytes to ... read
LD DE,32768 ; Destination start ... loop: IN A,(C)
LD (DE),A
INC DE ...
DEC HL
JR NZ,loop
A fast DRAW routineI was investigating how to speed up the line drawing for the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20225"]BASIC compiler[/URL]…
... dx in c
ld hl, __INCX ; xi = 1
... = X1 - X2
ld c, a
ld hl, __DECX ; xi = -1< ... dy in b
ld hl, __INCY ; y1 = 1
... a ; dy = Y2 - Y1
ld hl, __DECY ; y1 = -1
Help?Hi All, I wonder if anyone has a few minutes to look at this bit of code I'm working on. I'm trying to move to sprites and want to do it with a scr…
... +0) ;low byte
ld (hl),a ;a, the screen address ... ;repeat 8 times
ld hl,bits ;reset bits (lines of ... next from top
ld (point),hl
ld hl,seed ;screen address table ... /> halt
ret
sprite ld hl,(point) ;address of current line ...Small Machine Code Routines Which Maybe UsefulAs part of creating Flynn's Adventure in Bombland I created a lot of little routines to do all sorts of things. A lot of these I created based on inp…
... with previous plot byte
ld (hl),a ; 7t - plot line one ... h ; 4t - down one
ld (hl),a ; 7t - plot line two ... with previous plot byte
ld (hl),a ; 7t - plot line one ... h ; 4t - down one
ld (hl),a ; 7t - plot line two ...quick - Zx80 ASM questionWhile I am ploughing through lots of ASM listings, one of my earlier adaptation attempts surprised me [B][asm code][/B] [code] org 32768 start: ld…
... />
[B]ld hl,text1 ; set HL with text1 data
call printtext ; call printline routine
ld hl ... ,text2 ; set HL with text2 data
ld a,(hl) ; get character to ...Frank N SteinThis is an improved bugfix for [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0001849"]Frank N Stein[/URL] as discussed recently in [URL="htt…
... : equ $5C3D ; 23613
PATCH2: LD HL, (ERR_SP) ; 42 61 92
DEC HL ; 43
DEC HL ; 43
LD SP, HL ; 249
Back to BASIC[U][B]Archaeology guide to programs compiled used MCODERII.d[/B][/U] After various people have been talking about "Frank'n'stein" I decided to finis…
...
+1 LD HL,0
+4 LD (59346),HL
+7 LD HL,LINES
+10 LD A,NVARS
+12 LD ...Pixel Color IncorrectHello i am new to the ZX Spectrum and z80 assembly language. I am coding my first game and am having a small problem. I am trying to make the botom r…
... /> di ; disable interrupts
ld hl, 22544 ; set ball's initial ...
ld (hl), a ; position the ball
ld hl, 23295 ; set ...
DrawOoze
ld (hl), a ; draw it
Last Sunset for LatticaHere's a [b]rough first draft[/b] of the [url=http://www.users.globalnet.co.uk/~jg27paw4/pourri/lattica.gif]Lattica map[/url], just to demonstrate th…
... ; turn off flashing edges
LD HL, $0032 ; A214 21 32 00 ...
org $A8F3
LD HL, $0032 ; A8F3 21 32 00 ...
org $AF36
LD HL, $0032 ; AF36 21 32 00 ...CrusoePlease add the following "known errors" description for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0002872"]Crusoe[/URL]: [QUOTE]Bu…
... A84D ; message address correction
LD A, $5D ; A84D 3E 5D ... POP BC ; B8F6 C1
LD HL, $2D2B ; B8F7 21 2B 2D ... ; B8FA A7
SBC HL, BC ; B8FB ED 42
Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too. [URL="http://www.speccy.org/foro/viewtopic.php?f=8&t=408&start=53"…
... di
ld hl,StartCopy
ld (5cedh),hl
rst ... StartCopy ld hl,0
ld de,32768
ld bc,16384 ...Bride of Frankenstein TAP has been hackedThe Bride of Frankenstein TAP on WoS doesn't have any spooks in it, so you're just wandering around an empty maze. This is because there's a RET at $…
... it is?
[code]
LD HL, $96D1 ; 8A9B 21 D1 96 ... 8A JP $8ABA
--------
LD HL, $B267 ; 92DF 21 67 B2 ... br /> --------
DEC (HL) ; 9E1C 35 change: OR (HL)
--------
B5A8 ...(part of) screen to UDGHere is a routine to copy a Y,X-position on screen to a UDG. 0<=y<=23 0<=x<=31 144<=udg<=165 (UDG "A" to UDG "U") [code] ; start code with ; PRINT …
Here is a routine to copy a Y,X-position on screen to a UDG.
0Nemesis the Warlock (BUGFIX)This is a bugfix for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0003387"]Nemesis the Warlock[/URL], please add the following "known …
... :
[CODE]
77ff: ld a,($caf3) ; exit: 0=horizontal ... jp z,$7825
7806: ld hl,($ca56) ; oops! may reach " ... when moving up
7809: ld ($caf4),hl
780c: jp $7825 ... 194
7806: ld hl,($ca56)
7809: ld ($caf4),hl
780c: jp ...Thanos (improved BUGFIX)This is an improved BUGFIX for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0005221"]Thanos[/URL], please replace the "known errors" d…
... :
658c 216b65 ld hl,$656b
658f 7e ld a,(hl)
6590 ...
65a3 218400 ld hl,$0084
65a6 226e65 ld ($656e),hl
65a9 ...
65f7 211800 ld hl,$0018
65fa 226e65 ld ($656e),hl
65fd ...Saving and Loading from tape in MC?I'm actually having problems with saving and loading from the ROM routines for the interpreter... I'm currently using the following codes for saving…
... /> [CODE]save:
ld ix, _tape_header
ld hl, _save_state
call 0x0970 ...
load:
scf
ld ... a, 0
ld ix, _tape_header
ld de, 17 ...automatic relocating of non-relocatable codeI was pondering upon the problem of changing absolute addresses used by CALL, JP, etc. when code is moved, without reassembling at the new location; …
... pointer
ld hl,CHANGE
add hl,bc
ld sp,hl ;point SP ...
ld (hl),e ;DE=new value
inc hl
ld (hl),d
Kiwi OS for z80 computerHi everyone, Nearly made my z80 computer with 2K ROM 32K RAM. It has an OS im still writing called Kiwi (apple, blackberry, you get the idea ;D) he…
... LD HL, 32800 ;LOAD HL WITH STACK POINT LOCATION
LD SP, HL ... br />
LD HL, 33000 ;LOAD HL WITH STARTING ADDRESS
HL ;REMEMBER HL
LD HL, 1527 ;LOAD HL WITH ...machine code loadercan someone have a look at this loader and break down what its actually doing and also how i can stop it from executing the 2 loads of headerless blo…
... 07
5B08 LD (5C48),A
5B0B LD HL,5800
5B0E ... LD BC,02FF
5B11 ... A
5B12 LD (HL),A
5B13 INC HL
5B14 DEC ... BC
5B15 LD A,B ...Keys redefine routine and key check.I have written some asm code which allows me to redefine keys (for a game etc.), and also allows me to be able to check any keypresses for the redefi…
... print_message
ld hl,key_left_port
call get_defined_key
ld hl,msg_right
ld hl,key_right_port
call get_defined_key
ld hl,msg_fire
Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... />
ld hl,tile_base ; tile_base
ld (next_tile_line),hl
start ld b ... here
ld hl,16385
ld (position_var),hl ; Reset print position
MCODE problem...Hi Folks, Trying to write a simple machine code program to hatch the screen. So far I have the following but even this is not working - it does not…
... ]21 40 00 LD HL,4000h
06 AA LD B,AA
11 01 00 LD DE,100h
70 LD (HL),B
23 ... INC HL
1B DEC ...Getting the contents of tablesHi All, I'm risking a potentially daft question here as it seems pretty fundamental but here goes: What's the best way of pointing register pairs a…
... to call a routine with hl pointing at a screen address ... /> [CODE] ld ix,blocktab
ld d,(ix+1)
ld e,(ix ... +0)
ld h,(ix+3 ... )
ld l,(ix+2 ... 'm basically longing for a ld hl,(ix) command!), I'm ...Lord Of The Rings; Files skipped ?Hi folks, Does anyone know what blocks 8~13 are for in the Lord of The Rings: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0006601[/url] I…
... /> 61440 LD HL,61440
61443 LD DE,23296
61446 LD BC,00144 ... RET
61660 LD HL,00000
61663 LD DE,00012
... DE
61673 LD BC,00012
61676 LD (HL),000
... C
61690 LD (39542),A
61693 LD HL,(57149)
[/ ...AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…
... /> LOGIC: ld hl,12
add hl,sp
ld sp,hl ;undo USR ... ld hl,OPCODES
add hl,bc
add hl,bc
ld ... bc
ld hl,OPERATE+1
ld a,(hl)
jr ...probably a stupid question about RST16I'm using the 'hello world' code borrowed from [url=http://equant-retrochallenge.blogspot.com/2008/07/zx-spectrum-assembly-programming-under.html]her…
... />
[code]
ld hl,line ; Print line
call ... out a line
ld a,(hl) ; Get character to ... in 'A'
inc hl ; Move onto the next ...
you can load HL and call it again immediately ...Is it possible to access the +3 disk drive via m/c in USR0 mode?Is it possible to access the disk drive of the +3 via m/c +3DOS calls when running in USR0 mode? I ask because I'm having an awful lot of trouble ge…
...
ld ($9000),sp ; 36864
ld bc,$7ffd
ld a,($5b5c ... /> ld b,3
ld c,5
ld d,0
ld e ... ,1
ld hl,filename ...
call 262
ld bc ...
