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Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
... the expression "x=y+USR Plot191" must always be ... ;Syntax: FLASH x=y+USR Plot191
;where x= ... br /> Plot191:ld bc,(23653) ;BC=(STKEND)
push bc
call $ ... br /> ld (23677),bc ;(COORDS)=BC
ld a,b ... -
Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
... USR Plot191
org 23296
Plot191:ld bc,(23653) ;BC ... =(STKEND)
push bc
call $2307 ... x
ld (23677),bc ;(COORDS)=BC
ld a,b ... -
Machine Code in 30 minutes - car gameWotcha folks, 30 years on and I'm still struggling with Machine Code. I'm going through the 30-minute tutorial on the Chuntey blog and it's all made…
[code]ei
ld bc,65278 ;read keyboard caps to ... l
moveright
ld bc,32766 ;read keyboard space to ... pressed. Surely increasing the L register moves the car to the ... -
llvm-z80 statusFew months ago I read about efforts to produce llvm back-end for the Z80 (even perhaps as part of new z88dk). Any update on that? I found [URL="htt…
... /> push de
push bc
ld ix, 0< ... ld hl, 0
pop bc
pop de
... should also be doing register allocation for the most ... means each subroutine has register allocation done in isolation ... -
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…
... previous post with "15 LET bc=USR 23296".
[code]
... 23296
LifeLoop:
ld bc,(23645) ;(CH_ADD)
ld ( ... (23645),bc ;restore CH_ADD
ld bc,41
add hl,bc ;skip ... -
Simple text scrolling routine...I'm having trouble writing a very simple text scroller, the idea is to use the ROM printer routine to print 32 characters each time the routine is ca…
Run with "LET bc=USR 50000: PAUSE 2" and repeat ...< ... /> ld de,dat1
ld bc,35
call $203C ;PR_STRING ... /> ld de,dat2
ld bc,datz-dat2-1
ldir ... -
Simple text scrolling routine...I'm having trouble writing a very simple text scroller, the idea is to use the ROM printer routine to print 32 characters each time the routine is ca…
... "PRINT AT 1,0;"" AND USR 50000: PAUSE 2" and repeat ... /> ld de,dat2
ld bc,32
call $203C ;PR_STRING ... /> ld de,dat2
ld bc,datz-dat2-1
ldir ... -
Simple text scrolling routine...I'm having trouble writing a very simple text scroller, the idea is to use the ROM printer routine to print 32 characters each time the routine is ca…
... PRINT AT 1,4;"" AND USR 50000: PAUSE 4" and ... push de
ld bc,(23688) ;BC=S_POSN
dec b ; ... moves
ld (23688),bc ;the print position one row ... /> pop de
pop bc
djnz loop
... -
Game of Life.Last year (I think) or maybe the year before, I entered a Game of Life simulator into the CSS CGC compo but for the Sinclair ZX81. I decided to port…
... /> 11 RANDOMIZE 0: LET bc=USR InitS:
BORDER 0: ... :";gen'p$:
LET bc=USR GenPG: IF INKEY$=" " ... br />
InitP: ;LET bc=USR InitP
call GetGPvars
GenPG: ;LET bc=USR GenPG
di
ld ... -
Game of Life.Last year (I think) or maybe the year before, I entered a Game of Life simulator into the CSS CGC compo but for the Sinclair ZX81. I decided to port…
... )
11 RANDOMIZE 0: LET bc=USR InitS:
BORDER 1: PAPER ... TO 20: LET bc=den=((i-1)*32)+USR InitG: NEXT i ... ;"Generation: ";gen'p$:
LET bc=USR GenPG: IF INKEY$=" " THEN GO ... -
Making noises with the AYHow do you go about making noises from the AY chip in machine code? I'm wanting to make a pulsating humming noise that increases in volume as you ge…
... CLEAR 32767
20 RANDOMIZE USR 32768
... number
pulsevolloop PUSH BC
LD BC,65533
OUT ... to next channel
POP BC
DJNZ pulsevolloop
clear a windowed area of the screenHi everyone! Ain't been on here for donkeys, but have recently started messing around with a little game. I'm looking for ideas/opinions on the bes…
... are normally 0
ld bc,25
ldir
ld ... "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@": NEXT r
30 RANDOMIZE USR 23296
40 PAUSE 0 ...clear a windowed area of the screenHi everyone! Ain't been on here for donkeys, but have recently started messing around with a little game. I'm looking for ideas/opinions on the bes…
... "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@": NEXT r
30 RANDOMIZE USR 23296
40 PAUSE 0 ... ; clear with zeroes
ld bc,32 ; dist to next pixel ... /> ENDR
add hl,bc ; next pixel line or attrib ...clear a windowed area of the screenHi everyone! Ain't been on here for donkeys, but have recently started messing around with a little game. I'm looking for ideas/opinions on the bes…
... would be needed after the USR call.
[code]
; clear ... ;: RANDOMIZE cols+256*rows: LET bc=USR ClearWindow
; row,col = top ... =rows
ld b,0 ;BC never exceeds 32, so B ...Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…
... ZX Guide:
[CODE]LD BC,#6FF
;no more than ... observed on "yellow" Scorpion.
; register C contains
; #11 for ...Detecting flash mode inversionsIs is possible to detect with certainty when flashing characters change from normal to inverted and vice-versa?
... *8: PAUSE 8:
LET bc=USR 23296:
NEXT r[/code ... ;: RANDOMIZE cols+256*rows: LET bc=USR FlashWindow
; row,col = top ...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].…
... />
[CODE]40 CLS : RANDOMIZE USR 32000: GO TO 40[/CODE ... de,16385
00190 ld bc,6911
00200 ld (hl ...Edge Grinder, how would YOU do it?I always meant to post about this and AndyC reminded me in the 'vs' thread in games. [QUOTE=AndyC;808887]The thing I love about threads like this is…
... code
RANDOMIZE USR 4000
and ... ,HL
LD BC,scrollset
ADD HL,BC
... D
POP BC ; lines
DJNZ decodelines
RANDOMIZE - still not sure what it does...Whenever I wish a random number I use RND like: 10 LET a=RND*100 20 PRINT a 30 GO TO 0 and "a" will truly be random. But if is do the following: …
... LET a=1+INT ((USR 64061*256+USR 64061)*n/65536)[/CODE ... 4B 39 FA rnd ld bc,(seed) ; xz -> yw
bc
006 000 06 00 ...Return to basic from sna created by Z80 compilerHow can I go back to basic when running sna created using Z80 Assembler ([url] http://www.worldofspectrum.org/utilities.html#crossass [/url])? For e…
... upon the format of the USR call, but will end with ... end marker.
[*]The IY register must point to $5C3A:ERR_NR ... .
[*]The H'L' register must point to a byte ...Help for beginner with z80Hi chaps, I'm reasonably new with z80, but had a fair amount of experience with 68000, so decided to give a few things a go. One little thing I'm t…
... code
RANDOMIZE USR 40000
It' ... ,HL
LD BC,scrollset
ADD HL,BC
... INC D
POP BC ; lines
DJNZ decodelines
Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... had to copy zpragma into usr/local/bin myself
usr/local/share/z88dk/include/_DEVELOPMENT ... : symbol not defined
^ ---- ld bc,+_gr_circle
make: *** [sp1_exc1_CODE.bin ...Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... had to copy zpragma into usr/local/bin myself
usr/local/share/z88dk/include/_DEVELOPMENT ... : symbol not defined
^ ---- ld bc,+_gr_circle
make: *** [sp1_exc1_CODE.bin ...Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... d(d$,r,c)=USR DoubleHeight
;LET bc=FN d(d ...Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... d$,r,c)=USR DoubleHeight
;LET bc=FN d( ... c)*8
ld bc,(23606) ;DE=(CHARS)
... add hl,bc ;HL=d$(c) bit pattern ... ;(DEFADD)
add hl,bc
call $33b4 ;STACK_NUM ...Hungarian notation for asm - Yes or No ?There is thing called hungarian notation - https://en.wikipedia.org/wiki/Hungarian_notation Basically it is all about using prefixed indetifier to i…
...
;
; Destroys:
; AF, BC, D, HL, AF'
; -----------------------------------------------------------------------------
register will be modified, and any ...
