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SjASMPlus cross compiler of Z80 assembly languageHi! I want to present you cross-compiler of Z80 assembly language: [B]SjASMPlus[/B]. [SIZE="4"]Features:[/SIZE] [LIST] [*]Z80/R800 documented and un…
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[*]Code inlining through colon (LD A,C:INC A:PUSH ... AF:IFDEF FX:LD A,D:ENDIF…)
[*]Structures ... 48/128, Pentagon 128, Scorpion 256, ATM-Turbo 512, Pentagon 1024 ... /> [*]Fake instructions as LD HL,DE (LD H,D:LD L,E)
[*]Source ... -
RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... ; extra space stored earlier
ld de,($5c4f) ; store the contents ... the streams table to store the
; offset
ld (hl), ...
ld h,$00 ; clear H
ld l,a ; CHAR to ...
ld h,$40 ; base location
ld l,a ; plus ... -
Help hacking Split PersonalitiesI`ve been hacking away at Split Personalities for the purpose of putting new screens and graphics (items). The current screen is at 41187 and is 160…
... />
Here is a table of the levels at 53901 ... .
; Levels table
org 53901
defw ... stuck. The code (or table) at the addresses in the ... 36
dec h ; 54599 37
ld h, 36 ; 54600 38 ... of code and a table but I can't ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
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inc h ;point left side to line2
ld a,(hl ... not, carry on
ld a,h ;otherwise, get ready to point ... 7 lots of 256 up the display file
ld h,a ;point ... 7 lots of 256 up the display file
ld d,a ... -
So... you want to format your 3.5" as 720K eh?Well, i've been trying to get hold of an application to make proper use of my 3.5" +3 floppy disks but i haven't been able to find any. I stumbled up…
... /> LD HL,HEAD0 ; Load HL with the beginning of our sector table ... LD HL,HEAD1 ; Load HL with the beginning of our sector table ... needs to hold 495
LD H,D ; Load HL with the ... -
So you want to make a cardgame......but you haven't got a good deck to display. Well here is a fully relocatable routine that will do the job for you. Place the code anywhere in me…
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LD HL,chars-start-256
... ADD A,32
LD H,A
CALL 1008 ... -
tricks to simplify codingWhen i started with programming in assembler i had very simple approach to do things. Just shifting bytes around, doing simple tests and so... Later …
... CODE]
call_from_table
;HL = table
;A = ITEM
ld l, a
jr ... /> inc hl
ld h, (hl)
ld (call_from_table2 + 1), hl ... br /> [CODE]
ld a, (ix + FRAC_PEN)
ld hl, p2_fracpentab
Optimize this assembly?Aiming for Variable*192 -> HL In the first case, I came up with the obvious method - *128 +*64: [code] ld a, (variable) ;13 ld h,0 ; 7 ld l,…
... , (variable) ;13
ld h,0 ; 7
ld l, a ; 4
LD A,(variable) 13
LD h,a ; A * 256 4
LD L ... ,0 ; L=0 7
SRL H ; A ... *128 11
SRL H ; 8
RR L ; HL ...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…
... as dictated by the screen table) it works fine and passes ... line at a time
ld h,(ix+1) ;point hl at ... br /> ld (point),hl
ld hl,seed ;screen address table pointer
seed defw screen ;screen address table pointer, table below
screen defw ...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…
... ; 4t - alt
ld h,0 ; 7t
ld l,a ; 4t - hl ... /> ld a,h ; 4t
and %00011000 ; 7t
or $4000/256 ; 7t ... - bring in screen pixel memory start
ld h,a ... quadrant down, reset h
ld h,c ; 4t - restore h
_PLOT2CHR_S1:
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…
... Store H before calculating
ld h,0
ld l,a ... to next byte of tile table
inc hl
... tile table, store it here
ld hl,16385
ld ( ... Point SP to address table
ld a,255 ; Need this ...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…
... /> eg if I have a table of tile data and want ... /> [CODE] ld ix,blocktab
ld d,(ix+1)
ld e,(ix ... +0)
ld h,(ix+3)
ld l,(ix ... 'm basically longing for a ld hl,(ix) command!), I'm ...Procrustean PrintingHere's a short routine to manage printing of text with command tokens, to avoid messing up the screen when they are expanded. It just prints as many …
... FPTOBC ;BC=addr
ld h,b
ld l,c
jp ... call $0c41 ;PO_SEARCH
SSNEXT2:ld a,(de)
push af ... pop af ;A =token's table offset
cp $03
Screen2StringFurther to writing that BASIC one-liner to redirect CAT to a string I thought that I'd do a general redirection routine for anything which normally p…
... 256*PEEK (a+1): DEF FN g(v)=v-FN h(v)*256 ... : DEF FN h(v)=INT (v/256)
... h(sa):
REM machine code
REM ld hl,(ptr) : ld ... (hl),a : inc hl : ld (ptr),hl ... sa): POKE sd+10,FN h(sa): RETURN
REM ...Graph Plothi! please, help with code: [PHP]For x=-100 To 100 For y=-100 To 100 If (x/2-25)*(x/2-25)+(y-50)*(y-50)<200 Or (x/2+25)*(x/2+25)+(y-50)*(y-50)<200 th…
hi! please, help with code:
[PHP]For x=-100 To 100
For y=-100 To 100
If (x/2-25)*(x/2-25)+(y-50)*(y-50)Rotronics Wafadrive v.1.80 ROM - Corrupt or purposely broken?I've been digging around the Wafadrive v1.80 ROM (from [URL="http://zxspectrum.it.omegahg.com/_RO.htm"]here[/URL]) and can't decide if the ROM is cor…
... /> ld d, $00
ld hl, $0cf7 ; address the hook-code table!? WTF ... ?
add hl, de
ld e, ( ... )
inc hl
ld h, (hl)
ld l, e
pop ... $13
;; hook-code-table
;
l_0d2d: defw $0c30 ...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…
... ]
Returns the value 256...
Register C:
Returns the value 256... makes sence. We are not ... /> 62 = LD H,D
63 = LD H,E
64 = LD H,H
65 = LD H,L ... br />
It should return 256... Makes sence as B is ...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…
... . That's (2^6 - 1)/256 = 25% of the time. Perhaps ... />
ld h,0
ld l,e
ld c,h
ld a,h
ld h,l
ld l,d
Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... in RAM for such a table?
--- ... If we create our vector table before
the ... code with our "create vector table" code?
... incl. 0x11D9
0x11DA LD H,D ; HL = DE ( ...
downloop:
0x11DC LD (HL),#0x02 ; mem. 0xffff is ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... BucScan:
ld a,(hl)
ld (de),a
... XOR B
LD H,A
LD A,C
RLCA ... Spectrum screen resolution, bytes 256 to 263 would hold ... /> rra
ld h,a
ld a,c
... below it, you add 256 (i.e. increment the ...Divide by 16 problem...I think.I *think* I have a problem with division. Now, this is not for the Spectrum but it [i]is [/i]for another Z80 platform. I'm converting [b]Speccies …
... the Speccie Xcoord rolls over 256 (the width of the screen ... ;
[code] ld hl,(spr_x)
srl h
rr l ...
ld a,l
srl a
ld h,0
ld l,a
[/code ...Drawing some spritesI figured I want to draw some sprites. My target was to do a 16x16 masked sprite. There's no clearing here, just drawing the sprites. My first ite…
... ) ; fetch y offset from table
ld d, 3 (iy)
ex ...
inc de
ld a, (de) ;repeat
and ... (iy) ; fetch y offset
ld h, 3 (iy)
add hl ...A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
... hi($)==hi($+8) ? 1 : 256[/code]
so ... it never oversteps the 256-byte boundary. If that ... /> inc h ;down one line
ld a,h ;check ... re done shifting
ld a,h ;else, load A ... 8 from it
ld h,a ;and put it back ...ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…
... get full length -> max 256
// full LZF can use ... loop
if(++(len.rr)==256) break; // increase length and ... ((buffer_sc-buffer)==_END||len.rr==256) break; // check at end ... start low byte
ld h,a ; 4t - h=a so hl now ...A Neat Redefine Keys RoutinePreviously, I’ve only shared this routine with a couple of people via PM, but I’ve now decided to make it public. I optimized it for size, so it uses…
... go through
ld ix,def_keys_table ;start of table into IX
; ld h,0 ;zeroize H
; ld l,(ix) ;# of keys ... /> ret
;Redefine Keys table:
;Col 1: control number ...Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…
... (from lookup table)
ld l,9 (ix)
ld h,#0x00
add ... glyph at once.
ld l, (iy)
ld h, #0x00
add ... , #0x00
ld h, a
ld a, (hl)
ld e, a
ld l,-2 (ix)
ld h,-1 (ix)
why am i getting b integer out of range in this code?ive tried running this in spin but thats what i get [code]main org 40000; ; We want a black screen. ld a,71 ; white ink (7) on black paper (0…
... /> ; Initialise coordinates.
ld hl,21+15*256 ; load hl pair with ... starting coords.
ld (plx ... .
random ld hl,(seed) ; Pointer
ld a,h
and ... 8k of ROM.
ld h,a
ld a,(hl) ; Get " ...Textured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…
... /> 340 POKE 63692,o-256*INT(o/256): REM lower byte
350 POKE 63693,o/256: REM higher byte
360 ...
