-
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…
... ] ld sp,IX
INC IXH[/B]
pop hl
pop de
pop bc
exx
pop hl
pop de
pop bc
pop af
[B] ld sp ... -
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…
... ) interrupt
.ifdef ROM0
ld sp, 0 ; set stack to top ... /> pop bc ; unstack BC
pop de ; unstack DE
pop af ; unstack AF
pop hl ... ; then copy to err_nr
ld sp, (err_sp) ; put value of err_sp ... -
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…
... get parameters
dec bc ; reduce BC
ld hl, -10 ; filenames can be ...
pop hl ; unstack pointer
ld a, (ix + 0) ; SCREEN$ and CODE ... area
pop bc ; unstack length
push hl ; stack pointer ... -
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, (prog) ; avoid corruption
ex (sp), hl ; stack prog
push bc ; stack ... or line
pop hl ; unstack new pointer
pop bc ; unstack length
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…
... ; round up
ld (hl), a ; store in buffer
and a ; ... /> pop hl ; unstack offset to HL'
exx ; main register set
ld bc, ( ... so
ld a, (hl) ; get digit from buffer
inc hl ; next digit ...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…
...
ex de, hl ; number to HL
ex (sp), hl ; number to stack ... /> pop bc ; unstack exponents
pop hl ; unstack pointer to exponent byte
ld a ...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 c, (hl) ; get code
ld hl, tbl_priors - 195 ; table address
add hl, bc ... 6, (hl) ; string?
org 0x2770
s_endloop:
pop bc ; unstack ...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…
... /> pop bc ; unstack BC
ld hl, (stkend) ; address of first location to HL
ld (hl), a ... parameters
pop hl ; unstack pointer
ex (sp), hl ; length to HL
and ...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 d, (hl) ; in DE
ld hl, re_entry ; stack re-entry
ex (sp), hl ...
ld a, c ; restore A
pop hl ; unstack HL
pop bc ; unstack BC
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…
... ; string null?
ex (sp), hl ;
ld a, b ;
jr ... ; reduce
inc hl ; lengths
ex (sp), hl ; and jump
... other_str:
pop bc ; unstack second
pop hl ; string parameters
ld a, c ...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…
... attribute screen address, and [B]HL[/B] referencing the corresponding pair in buffer ... :
[CODE] ld a,(hl)
ld (bc),a
dec hl
ldd[/CODE ...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…
... screen in Finders Keepers
[CODE]ClearScreenPart1:
9551 210000 ld hl ... ,$0000
9554 010c00 ld bc,$000c
ld sp,ScreenAttrTop
ClearScreenPart1Lp:
955e e5 push 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…
... d ; point to next screen location
inc l ... /> dec de ; adjust screen pointer
djnz pos_2a ... /> dec de ; adjust screen pointer
djnz pos_5a ...
ld (coords), hl ; set coords
pop bc ; unstack ...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…
... backbuffer to screen
LD BC,999
LD DE,04000h
LD HL,37000 ... /> [COLOR="Red"]
pop hl
pop de
pop bc
pop af
[/COLOR ...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…
... />
//copy backbuffer to screen
#asm
push af ... push hl
LD BC,999
LD DE,04000h
LD HL,37000
pop hl
pop de
pop bc
pop af
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 de, mem_2_4 ; temporary buffer
push hl ; stack ... HL
ld (hl), 14 ; store hidden number marker
pop bc ... buffer address
ld bc, -10000 ; insert
call insert_dgt ; ten-thousands
ld bc ...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…
... lower screen in use
pop bc ; ... HL
pop bc ; unstack row and column
.ifdef ROM1
ld ...Map compressor based on ZX7Hi I have release a map compressor for "La Churrera" game engine, but can be adapted to any other game. Source code is here (Download TmxCompress.0.…
... /> ld b, d ; b= 0 because lddr moves bc bytes
ex (sp), hl ... /> lddr
pop hl ; restore source address (compressed data)
ld b, a ...Map compressor based on ZX7Hi I have release a map compressor for "La Churrera" game engine, but can be adapted to any other game. Source code is here (Download TmxCompress.0.…
... /> ld b, d ; b= 0 because lddr moves bc bytes
ex (sp), hl ... /> lddr
pop hl ; restore source address (compressed data)
ld b, a ...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…
... fires a rocket up the screen, but refuses to detect collisions ...
pop bc
djnz loop
ret
print ld a,2 ... HL, HL
ADD HL, HL
ADD HL, HL
ADD HL, HL
ADD HL, HL
LD DE ...Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…
... pop iy
pop ix
pop hl
pop de
pop bc
pop ... hl
ld hl,(_mytimer)
inc hl
ld (_mytimer),hl
pop hl ... rendernow=1;
} // draw screen now
...Clear the screen from assemblerI want to clear the screen before I draw my graphic elements on it. Speed is not important so I was thinking of using the rom CLS option if that is p…
... set a buffer
[code]
; clear_mem/set_mem
; hl = memory ... to clear or fill a buffer with the same byte value ... that as well as the screen, so wrote a subroutine for ... can just just ld hl, address; ld de, address+1; ld bc, count-1 and ...Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…
... pop iy
pop ix
pop hl
pop de
pop bc
pop ... hl
ld hl,(_mytimer)
inc hl
ld (_mytimer),hl
pop hl ... rendernow=1;
} // draw screen now
...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…
... pop iy
pop ix
pop hl
pop de
pop bc
pop ... hl
ld hl,(_mytimer)
inc hl
ld (_mytimer),hl
pop hl ... rendernow=1;
} // draw screen now
...bit manipulation conundrumWhat's a neat way to change this bit pattern in registers BCDE: [code]Loop0: ;change B:00000000 C:abcdefgh D:ijklmnop E:qrstuvwx[/code] to this bit …
... /> ld ix,bufferSource
ld iy,bufferTarget
; store in source buffer ... /> pop hl
ld (hl),b
inc hl
ld (hl),c
inc hl
ld (hl),d ... af'
djnz Loop0
pop bc ; recover the loop counter from ...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…
... attempt in filling a complete screen with all the tiles in ... br />
bigloop
pop af
ld b,14 ;width
call draw_tile
pop af
pop hl
pop bc
pop de
push af
ld a,(change+1)
add ...Clearing 22 lines of the screenHow do I go about clearing the top 22 lines of the screen and leave the bottom #0 area untouched? I have a routine to reset the attributes, but cant…
... upper screen)
CALL 05633 ; CHAN_OPEN a=2
LD BC,cleartextend ... />
LD HL,cleartext+1
INC (HL)
POP BC
DJNZ ...Help with File Compressor by Mladen PopovicHi, I'm trying to compress BombJack (MCM) and transfer it to a +3 disk (Yes I own the original game :) ). I'm unsure about the addresses to enter in…
... /> ld hl,dec40 ; copy unpacker
ld de,23296 ; to 23296
ld bc,end_dec40 ... ; do it
ld sp,24099 ; set stack
ld hl,65535-21602 ; address ... hl,de
ld c,a
ld b,0
ldir
pop hl ...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,2
call 5633 ;open channel to screen (top ... 22 lines)
ld de,dat ;point ... /> ld bc,6 ;BC contains string length
call 8252 ;PRINTs string
pop hl ...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…
... open channel to screen (top 22 lines)
; ld de,dat ... data string
; ld bc,6 ;BC contains string length
... address of string
ld bc,eostr-dat ; length of ... /> pop hl ;recover value from the stack
ld (23606),hl ;restore ...
