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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…
... /> xor a ; a=0
ld (player_fracX), a
ld a, WINDOW_RIGHT
.notoffrhs
ld c, a
ld a, (player_fracX ...
; outer loop
ld c, a
ld a, 8
sub c
ld b, 8
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…
... /> xor a ; a=0
ld (player_fracX), a
ld a, WINDOW_RIGHT
.notoffrhs
ld c, a
ld a, (player_fracX ...
; outer loop
ld c, a
ld a, 8
sub c
ld b, 8
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…
... /> ; b row
; c column
;
sprite8x8aDoubleStride:
; zero A
xor a
; outer loop
ld c, a
ld a, 8
sub c
ld b, 8
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…
... /> ; c = pixel x-coord/8
;
sprite8x8caAlwaysLookupRow:
; zero A
xor a ...
; outer loop
ld c, a
ld a, 8
sub c
ld b, 8
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…
...
; outer loop
ld c, a
ld a, 8
sub c
ld b, 8
xor a
REPT 7
ld (hl), a
inc l
ld (hl), a ...
add c
ld l, a
xor a
; unroll loopRobospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... /> ld a, (quitpressed)
dec a
jp nz, mainloop
xor a
ld (quitpressed), a ... it
add c
ld l, a
ld b, 15
.loop:
; blit ... column C and C+1
ld a, (de)
xor (hl)
ld (hl), a
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…
...
; outer loop
ld c, a
ld a, 8
sub c
ld b, 8
xor a
REPT 7
ld (hl), a
inc l
ld (hl), a ...
add c
ld l, a
xor a
; unroll loopRobospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... it
add c
ld l, a
ld b, 15
.loop:
; blit ... column C and C+1
ld a, (de)
xor (hl)
ld (hl), a
C and C+1
ld a, (de)
xor (hl)
ld (hl), a
Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
...
ld b, a
ld c, 0
ld a, 7
sub b ; b = 7 - b. also clears ... /> ld b, a ; first loop count
.nextlinedown
ld a, d
xor (hl)
ld (hl), a ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... loop count
ld d, line_data00/256
ld a, (hl)
ld e, a
ld a, (de)
ld b, a
inc e
ld a, (de)
ld c, a
ld l, a
xor a
ld (hl),Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... /> xor a
.ok
ld hl, electrode_positions
ld b, a
ld a, (num_electrodes)
ld c, a
place_electrodes:
ld a, (num_electrodes)
ld b, a
.loop
push bc
Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
...
; outer loop
ld c, a
ld a, 8
sub c
ld b, 8
C and C+1
ld a, (de)
xor (hl)
ld (hl), a
C and C+1
ld a, (de)
xor (hl)
Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
...
ld b, a
ld c, 0
ld a, 7
sub b ; b = 7 - b. also clears ... /> ld b, a ; first loop count
.nextlinedown
ld a, d
xor (hl)
ld (hl), a ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... loop count
ld d, line_data00/256
ld a, (hl)
ld e, a
ld a, (de)
ld b, a
inc e
ld a, (de)
ld c, a
xor 6
ld l, a
xor a
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld (scr_out_col), a
ret
.nextline
xor a
ld (scr_out_col), a
ld a, (scr_out_row ... /> ld l, a
; loop counter
ld b, 8
ld a, c
.loop
ld (hl), a ; draw ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld a, (bc)
ld e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... /> ; loop counter
ld b, 8
.loop
ld a, (hl)
xor #FF
ld (hl), a ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld a, (bc)
ld e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... /> ; loop counter
ld b, 8
.loop
ld a, (hl)
xor #FF
ld (hl), a ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld a, (bc)
ld e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... /> ; loop counter
ld b, 8
.loop
ld a, (hl)
xor #FF
ld (hl), a ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld a, (bc)
ld e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... /> ; loop counter
ld b, 8
.loop
ld a, (hl)
xor #FF
ld (hl), a ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld a, (bc)
ld e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... /> ; loop counter
ld b, 8
.loop
ld a, (hl)
xor #FF
ld (hl), a ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld a, (bc)
ld e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... /> ; loop counter
ld b, 8
.loop
ld a, (hl)
xor #FF
ld (hl), a ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ld a, (bc)
ld e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... /> ; loop counter
ld b, 8
.loop
ld a, (hl)
xor #FF
ld (hl), a ...Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …
...
ld hl, pixelmsk
ld a, c
and 7
ld c, a
add ... hl, bc
ld b, (hl ... )
ex de, hl
ld a, (hl)
xor b
ld (hl), a ...Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…
... to sprite data
LD B,TOTALSPRITES ; And loop for the total number ... /> LD A,(IX+1)
LD B,A
LD C,(IX+0)
INC C
LD A,C
IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... to sprite data
LD B,TOTALSPRITES ; And loop for the total number ... /> LD A,(IX+1)
LD B,A
LD C,(IX+0)
INC C
LD A,C
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... br />
LD B,160 ; Loop 128 times of 48 instructions ... LD A,B
LD C,A
PUSH BC
LD A,(YPOS)
LD B,A ... br />
LD B,160 ; Loop 128 times of 48 ...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... contains a copy of the Background
So, each loop I ... /> LD A,B
RLA
RLA
LD C,A
; Col 1
LD A ...Problem with rotating procedureHi folks! I wrote a proc in z80 asm, based on: x' = x * cos (z) - y * sin (z) y' = x * sin (z) + y * cos (z) I used a precalculated table of sin a…
... ld a,e
add a,c
ld e,a
ld a,d
adc a,b
ld ... br /> ;data.inc 2006 (c) by Xor
;============================================================================
org ...Screen LoaderCouple days ago i find very interesting loader routine in ex Yugoslavia magazine "Svet Kompjutera" from january 1987. Authors of article, calls this …
... /> LD A,C
XOR &03
LD C,A
LD H,&00
LD B,& ... RL C
XOR L
RET NZ
LD A,C
RRA
LD C,A ... /> LD B,4
LOPP LD A,(FL1)
…
