-
Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... address
push bc
call copy
pop bc
a2s_l:
mlp1:
add hl,hl ;uses mask bytes as a ... d ;point DE to screen
ld (de),a ;put byte ... -
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…
... routine above to do full screen PLOT & DRAW, with a ... ]
[code]
;Full Screen PLOT & DRAW, Y=0 ... de
exx
pop bc
DLstep: ld hl,($5c7d) ;H'L'=(COORDS ... -
Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…
... /> add hl,hl
add hl,hl
ld bc,font-256
add hl,bc ;load char ... ;back on screen
inc e ;next screen byte
ld a,(de ... />
pop de ;restore screen addr
char_attr1
ld a,0 ... -
Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... + 1 line (20h)
ld hl,0bf40h ;plasma table of 192 ... br /> mlp1:
ld a,(de) ;get SCReen buffer byte
and b ... 2x2 square
pop hl ;restore plasma address into HL
nxt_block:< ... -
printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
... /> ld a,234
ld hl,22528
ld de,22529
ld bc,767
ld (hl ... hl,de
pop de
;POKE CHR ONTO SCREEN
ld b ... -
printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
... /> ld a,234
ld hl,22528
ld de,22529
ld bc,767
ld (hl ... hl,de
pop de
;POKE CHR ONTO SCREEN
ld b ... -
printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
... /> ld a,234
ld hl,22528
ld de,22529
ld bc,767
ld (hl ... hl,de
pop de
;POKE CHR ONTO SCREEN
ld b ... -
Printing text using direct screen addressingHaving some problems printing using the FASE engine which is currently defeating me. Hoping to have someone clear out the bit of fog currently dwell…
... that the currently active screen is already being ... pop af
pop de
pop ix
push af
print: ld ... b
ld a, (hl)
ld (de), a
ld (bc), a
Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…
...
add hl,hl ; multiply HL by 8
add hl,hl ; /
ld bc,font-256 ... address of character
add hl,bc ;bitmap (chr code*8+font ... HL
pop de ;restore screen attr addr
char_attr1
ld ...My AGD games have AY music (finally!)!!Thanks to David Saphier six of my AGD games have AY music you can play them onine or download them at zxbasic.uk https://www.youtube.com/watch…
... memory after the AGD game buffer (200-300 bytes depending on ... /> ld hl,23672
inc (hl) ; keyboard reading
pop de
pop bc
pop hl ...How to store and recall a "window"?I would like to memorize and then restore a rectangular portion of a screen, pixels and attributes. To make things easier, this "window" would be sit…
... /> ; HL calculated
; ============
; Copying data to screen
ld ... de, 16392
ld b, 8 ... a, e
ld e, a
pop bc
djnz l3 ...What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
... . You have a Stack pointer (SP) which is a special register ... /> POP BC = 10 T states
An equivalent:
LD B,(HL ... a POP BC, the following happens
C = (SP); B = (SP + 1); SP = SP + 2 ...What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
... ASM routine to fill the screen with a checkerboard background - as ... /> ld a,%01010101
ld e,32
push hl
pxlineloop2 ld (hl),a ... a,32
ld l,a
pop bc
dec c
How to write a simple C+asm horizontal scrolling game (Tutorial, z88dk)[b]How to write a simple C/asm horizontal scrolling game[/b] [b]Note:[/b] This tutorial has multiple parts... I am still writing but this first pa…
... pop bc
pop de
push hl
push de
ld hl, bc
add hl, hl ... This function returns the screen address, given its y ... will draw a player on screen:
[code ... the player outside of screen, causing an error. ...How to write a simple C+asm horizontal scrolling game (Tutorial, z88dk)[b]How to write a simple C/asm horizontal scrolling game[/b] [b]Note:[/b] This tutorial has multiple parts... I am still writing but this first pa…
... score right after scrolling the screen.
And we increase the ... weird way of the Spectrum screen is being set up, you ... /> pop bc
pop de ; de = dest
pop hl ; hl = number
push bc
ld bc ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... say in MC and LOWER screen. normal screen is Stream 2, but ... equ 23670 ; (was) used as buffer
sys_udg equ 23675 ; udg ... /> fetchan ld a,(hl)
push hl
call setchan
pop hl
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... cell anywhere on the screen (or to a screen buffer).
I used a back screen buffer to draw to which started ... ld d, (hl) ; d = high byte of screen address
ex de, hl ; hl = screen ... of the tiles
ld bc,kncpote-poztest ;the beginning ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... br /> ld e, (hl) ; e = low byte of screen address
inc hl ; hl points ... /> ld d, (hl) ; d = high byte of screen address
ex de, hl ; hl = screen address ... /> ld (ix+1), h
push bc
call sprite8x8a
pop bc
pop hl ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... />
; Print text on screen
; FB
; ... ; (was) used as buffer
sys_udg equ 23675 ... fetchan ld a,(hl)
push hl
call setchan
pop hl
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... /> ld (ix+1), h
push bc
call sprite8x8a
pop bc
pop hl ... br /> ld e, (hl) ; e = low byte of screen address
inc hl ; hl points ... /> ld d, (hl) ; d = high byte of screen address
ex de, hl ; hl = screen address ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... /> ld (ix+1), h
push bc
call sprite8x8a
pop bc
pop hl ... br /> ld e, (hl) ; e = low byte of screen address
inc hl ; hl points ... /> ld d, (hl) ; d = high byte of screen address
ex de, hl ; hl = screen address ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... /> ld (ix+1), h
push bc
call sprite8x8a
pop bc
pop hl ... br /> ld e, (hl) ; e = low byte of screen address
inc hl ; hl points ... /> ld d, (hl) ; d = high byte of screen address
ex de, hl ; hl = screen address ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... /> ld (ix+1), h
push bc
call sprite8x8a
pop bc
pop hl ... br /> ld e, (hl) ; e = low byte of screen address
inc hl ; hl points ... /> ld d, (hl) ; d = high byte of screen address
ex de, hl ; hl = screen address ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... />
; Print text on screen
; FB
; ... ; (was) used as buffer
sys_udg equ 23675 ... fetchan ld a,(hl)
push hl
call setchan
pop hl
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... />
; Print text on screen
; FB
; ... ; (was) used as buffer
sys_udg equ 23675 ... fetchan ld a,(hl)
push hl
call setchan
pop hl
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... />
; Print text on screen
; FB
; ... ; (was) used as buffer
sys_udg equ 23675 ... fetchan ld a,(hl)
push hl
call setchan
pop hl
