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Zynaps scrolling - anyone ever reverse enginnered this?Zynaps has IMO some impressive scrolling - it utilises 18 character rows of the display file, so quite a large active play area, and scrolls 2 pixels…
... grabbed this using ZX SPIN's debugger.
... , l_86b0 ; 34437
ld c, a ; 34439
ld b, ... ld e, (hl) ; 34614
push de ; 34615
ld a, c ; ... 34616
ld c, 255 ; 34617
... -
Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…
... to 41 bytes, but it's real ugly looking, self modifying ... />
ld a, c
patchadd: add a, %10000000
ld c, a
patch ...
ld a, c
ld (de), a
inc e
djnz loop ... -
Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…
... table address
DEC E ; Decrement key loop ... ","X","C","V"
DB &FD,"A","S","D ... address
DEC E ; Decrement key loop ... address
DEC E ; Decrement key loop ... -
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…
... - SHIFT, Z, X, C, & V
; #FD - A, S, D, F, & ... ; G
; #FB - Q, W, E, R ... br /> in a, (#FE)
; stash A in C
ld c, a
bit ... /> ld d, h
ld e, l
jp sprite8x8caAlwaysLookupRow
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…
Here's a routine to draw a 16x16 sprite at an ... ;
sprite16x16ca:
; zero A
xor a
; convert row -> ... C and C+1
ld a, (de)
ld (hl), a
inc e ... C and C+1
ld a, (de)
ld (hl), a
inc e ...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 b, d
ld c, e
push bc
jr ... />
[/code]
It's called like this
[/code]
It's not fast enough to draw ... level.
I wrote a helper routine (practicing "stack abuse ...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…
It's nearly bedtime for me, so I'll do a code dump ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... is terrible ;)
There's a few test switches you can ...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 and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ... C and C+1
ld a, (de)
ld (hl),
Paradigm Shifter
July 2022
Development
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 and C+1
ld a, (de)
ld (hl), a
inc e ; e ... up the code a bit. It's still a lot of code I ... the bugs in it - it's beer o'clock of course ... , jewel) first though, since that's easier.
The exit ...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…
... /> blkscr ld a,71
ld (23693),a
xor a
call ...
;*title screen graphic's tile placement data goes here ... /> ld b,d
ld c,e
push bc
jr ... /> ld b, d
ld c, e
push bc
jr ...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…
... - SHIFT, Z, X, C, & V
; #FD - A, S, D, F, & ... ; G
; #FB - Q, W, E, R ... /> ; are we pressing A, S or D?
ld a, #FD
in ... C and C+1
ld a, (de)
ld (hl), a
inc e ...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 and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ; e ... C and C+1
ld a, (de)
ld (hl), a
inc e ... C and C+1
ld a, (de)
ld (hl),
Paradigm Shifter
July 2022
Development
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…
... today's progress
EQUs and a macro for constructing a line ... c, .cantalloc
ld a, dir
ld (de), a
xor a
a
ld a, maxlife
inc e
inc e
ld (de), 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…
... />
IF STRIPES
ld c, 12
ld hl, ATTRIBS ... /> ld b, 32
ld a, 7Sort 2 byte words (x, y) on ypos, also question about swap (DE), (HL)Well that was a lot of debugging ;) But if you want a routine which takes an array of 16 byte words x, y and then sort them on y (ignoring x), I'm…
...
push bc
ld a, c ; largest
; left = 2 * ... ? looks like it does, that's lucky lol
.thatsok
.dontcheckright
ld a, c ; A = largest
pop bc
or a
sbc hl, de
ld e, c
add ...Sort 2 byte words (x, y) on ypos, also question about swap (DE), (HL)Well that was a lot of debugging ;) But if you want a routine which takes an array of 16 byte words x, y and then sort them on y (ignoring x), I'm…
...
ld a, c
and ~1
ld e, a
rrca ... /> ld a, c ; a = count
sub e
dec a
ld c, a ; count ... /> .setcounttostep
ld a, e
ld c, a
pop hl ; hl ... debugging/coding when it's no longer beer o' ...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…
... e
ld (de), a
ld a, c
inc e
ld (de), a ... e
ld (de), a
ld a, c
inc e
ld (de), a ... interval collision checks, and there's an expanded version if you ...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…
... - SHIFT, Z, X, C, & V
; #FD - A, S, D, F, & ... z, .notfiringupordown
ld a, e
or a
jr nz, .firingdiagupordown ... a, b
add 3
ld b, a
ld a, e< ... br /> or a
jp m ...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…
... should have removed this it's not necessary, quicker to use ...
ld c, a
; remember e (=player_x) in A'
ld a, e
ex ... /> ld a, c ; a = count
sub e
dec a
ld c, a
jr ...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…
... looks like it does, that's lucky lol
.thatsok< ... de
.dontcheckright
ld a, c ; A = largest
pop bc
or a
sbc hl, de
ld e, c
add ... /> ld b, c
ld c, a
dec c
call heapify_words ...Advice on electric guitar learning, pleaseSo, briscaF1 junior (who is 10 and not the tallest person) has signed up for some "pop/rock" guitar tutoring at skool (sic) which basically translate…
... properly rock out you need a pick for fast stuff, ... get used to it. That's more advanced though.
... chords to learn should be E, Am, A, C, D, Dm, G. ... though). You can play a lot of songs with just ... />
Don't buy a silly shaped electric guitar that ...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…
... 9: delete
There's also some keys which are ...
ld l, a
; remember C in A
ld a, c
; copy ... character
ld a, c
and #3f
ld e, a
add ...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…
... flashing cursor was a pain and there's probably some bugs ... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... /> ld l, a
; remember C in A
ld a, c
; copy ... br /> ld a, c
and #3f
ld e, a
add ...
