-
Fast and easy read/write of attributes?What are the fastest or easiest ways to check the attributes of tiles on the screen, in BASIC? It seems to be a great way of storing object info. …
...
ld a, (attr)
ld (hl), a
ei< ... for high byte.
add a,88 ; 88*256=22528, ... /> add a,l ; add to low byte.
ld l,a ; hl=address ... of attributes.
ld a,(hl) ; return attribute in a ... -
Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... = B * 2
ADD HL,DE ; HL = table row address
LD E,A
ADD HL,DE ; HL = screen pixel ... byte address
LD A,C ... -
So shooting 360 degrees?...[I]How do I go about having - for example - a cannon in the middle of the screen, that can shoot in any direction towards the player?[/I] Well, I do…
... about having - for example - a cannon in the middle of ...
I can think of a couple of ways of doing ... cos, but that seems a biiit long-winded and overkill ... m kinda hoping someone has a more fast and efficient ... br /> ;x=x+dx
add hl, de
; where H, ... -
Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... ,$00
LD L,A
ADD HL,DE ; HL = screen pixel byte address ...
LD A,C
AND ... -
FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... /> ;; buffer to hl
ld iy,#0x0000
add iy,sp
a,(c)
in a,(c)
;; FUSE HACK END
;; add ... ; 4 t-states
ld (hl),a ; write to buffer | 7 t ... -states
inc hl ; increase buff. counter | 6 t ... -
Drawing a dotted line...Hi Folks, I cannot be the first person to want this (?) so here goes! Does anyone have a MC routine that does the same as the BASIC DRAW command bu…
... bc,10
add hl,bc
ld (23653),hl ;restore the calculator ... /> L_24DF: LD HL, ($5C7D)
LD A, B
ADD A, H
LD ... -
FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... /> ld hl,#0x0000
add hl,sp
inc hl
inc hl ; hl points to ... /> cpl ; prepare result in a
ld (hl),a ; write to buffer
inc hl ; increase buff. counter
Change PAPER and BORDER colours from machine codeHow do you go about changing PAPER and BORDER colours from machine code? I've forgotten the system variables for border and paper.
... H to 0, and do ADD HL,HL three times - that multiplies ... result as a 16-bit number in HL. Then put ... This copies a byte from (HL) to (DE), increments HL and DE, ... in screen memory, within a character space, each byte ... is LD A,(HL) then LD (DE),A then INC HL then ...Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... ,(HL)
LD (63092),DE
ADD HL,BC
LD D,(HL)
ADD HL ... ,BC
LD E,(HL)
POP HL
POP BC
LD A,32
ADD A,L
Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... ;unnecessary
add hl,bc
ld a,(hl)
ex af,af ... :
ld (hl),a
inc hl
djnz colloop
add hl,de ;skip ...Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
Here's a much neater version of my ... , as it was only doing a check on y, whereas all ... b(x,y,w,h,a)=USR 63000
110 INPUT ... ,"Width=";w:
INPUT "Attribute=";a
120 LET y=INT ... : LET w=INT w: LET a=INT a
130 LET y ... h31) OR w=0 AND accZ80++Here is the url for a new compiler pour all computers with Z80: [url]http://ccz80pp.webcindario.com[/url] It's a beta version, but it's works. If y…
... hl,3
add hl,sp
ld c,(hl)
INC HL
INC HL ... />
LD HL,16384
LD A,B
ADD A,L
LD ... L,A
LD A,(DE)
LD (HL),A
LD A,(DE)
LD (HL),A
INC ...Problem Reading the KeyboardHi Folks, I'm working my way through Toni Baker's rather good book and thought I'd write some code to scan the keyboard and store the results so tha…
... /> ADD HL, BC ; "
DEC HL ; "
LD A, (HL) ; "
POP HL ; "
IN A, (0xFE ...Problem Reading the KeyboardHi Folks, I'm working my way through Toni Baker's rather good book and thought I'd write some code to scan the keyboard and store the results so tha…
... the keyboard segments
LD HL,_currentKeyStates ;Where to store the ...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…
... that the
IsNeg: add a,175 ;ADD will calculate -16:+175 ... br /> ld h,a
ld a,(23677) ;A =x
... djnz MoveBit
or (hl)
ld (hl),a
pop bc ...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…
... that the
IsNeg: add a,175 ;ADD will calculate -16:+175 as ... 0:+191
ld a ... /> djnz MoveBit
or (hl)
ld (hl),a
pop bc ...ZX-Assembler file handling concept[QUOTE=clausjahn;777075]Dear readers, At this time, it's a good time to ask you, the future users, how to implement the file usage. Let's suggest so…
... /> Cycle ld a,(ix)
or a
ret ... z
ld b,a
call CallR
... br /> ld hl,RoutStart
add hl,bc
push hl
...ZX-Assembler file handling concept[QUOTE=clausjahn;777075]Dear readers, At this time, it's a good time to ask you, the future users, how to implement the file usage. Let's suggest so…
... ,0
ld hl,RoutStart
add hl,bc
push hl
ret ... /> add hl,hl
add hl,de
ld a,(hl)
inc hl
ld h,(hl ...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…
... , a
ld hl, a
inc hl
ld d, (hl)
ld a, (a)
a
ld h, b
ld l, c
add hl, de ... /> ld hl,(_b)
add hl,de
ld (_c),hl
ld hl,0 ...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…
... ld bc,41
add hl,bc ;skip over header, ... />
ld a," "
ld hl,0
ld ... br /> adc hl,bc
ld a,3
CountC: ld a,2 ;if live count ...Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …
...
add hl, bc
.marchtest3.loop
ld a, (hl)
xor a
ld (hl), a
dec hl
dec bc ...
add hl, bc
.marchtest4.loop
ld a, (hl)
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…
... a,h,0; calculate adress ROM font
add hl,hl ... ;ascii*8
add hl,hl
add hl,hl
ld bc ... ,$3C00;ROM font
add hl, ... bc
ex de,hl
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…
... a routine by Jon Ritman
LD D,L
ADD HL,HL
ADD HL,HL ...
add a,10 ;" "+10="*"
LoadP: ld (hl),a
inc hl
dec ...Creating a linked list in Z80[FONT=Calibri][SIZE=3]I am using a circular buffer to store tiles to be displayed on the screen. Tiles only appear for a set period of time, so when …
... /> ld hl,linkbuf
xor a
lp_ini
ld (hl),a
inc ... l
add a,5
jr ... />
[code]
;add new sprites
ld hl,(spr_num)
ld ...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…
... ; preserve stack
ld a,192+24 ; 192 pixel lines ... de
ENDR
add hl,bc ; next pixel line or ... /> [CODE] ld a,192 ; 192 pixel lines
ld hl,16384+LAST_COL ...
