-
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"…
... list of keys
IN A,(C) ; Read the row of ... next table address
DEC E ; Decrement key loop counter< ... ,"#","Z","X","C","V"
DB &FD,"A","S","D","F ... "
DB &DF,"P","O","I","U","Y"
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, & ... , 7, & 6
; #DF - P, O, I, U, & Y ...
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…
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 ...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…
... , 7, & 6
; #DF - P, O, I, U, & Y ... /> ; are we pressing A, S or D?
ld a, #FD
in ... c,a
add a,a
add a,c
add a,a
add a,a
add a,c ... C and C+1
ld a, (de)
ld (hl), a
incHow 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…
... />
IF STRIPES
ld c, 12
ld hl, ATTRIBS ... /> ld b, 32
ld a, 7Robospec (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, & ... , 7, & 6
; #DF - P, O, I, U, & Y ... b, a
ld a, c
add 4
ld c, a
max_life_movingD ...
ld b, a
ld a, e
or a
jp m ...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 ... is the column
jp p, .ok
ld h, 31 ... 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 left ... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ...
ld l, a
; remember C in A
ld a, c
; copy ... is the column
jp p, .ok
ld h, 31 ...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…
... in v
uint8 c; // c accumulates the total bits set ... .toomanylines
dec e
and e
ld e, a
jr nz ... #CountBitsSetKernighan
^ that's a good resource that but sadly ... in (kbd_buff + 4)
P to Y mapping from 25 ...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…
... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... , #7C, #60, #60, #60, #00 ; P
db #38, #6C, #C6 ... , #3C, #0E, #66, #3C, #00 ; S
db #7E, #18, #18 ... , #70, #3C, #0E, #7C, #00 ; s
db #30, #30, #7C ...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…
... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... the column
jp p, .ok
ld ... /> ; it's not a number
or a
ccf
P
db #38, #6C, #C6 ... 66, #7C, #60, #60 ; p
db #00, #00, # ...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…
... properly at the moment, that's easy though.
It ... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ...
ld l, a
; remember C in A
ld a, c
; copy ... is the column
jp p, .ok
ld h, 31 ...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…
... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ...
ld l, a
; remember C in A
ld a, c
; copy ... is the column
jp p, .ok
ld h, 31 ... is the column
jp p, .ok
ld h, 31 ...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…
... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... the column
jp p, .ok
ld ... /> ; it's not a number
or a
ccf
P
db #38, #6C, #C6 ... 66, #7C, #60, #60 ; p
db #00, #00, # ...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…
... it is not a valid character constant e.g. 'p' is valid, '\n ... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... , #3C, #0E, #66, #3C, #00 ; S
db #7E, #18, #18 ... , #70, #3C, #0E, #7C, #00 ; s
db #30, #30, #7C ...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…
... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... #60, #60, #60, #00 ; P
db #38, #6C, #C6 ... #0E, #66, #3C, #00 ; S
db #7E, #18, #18 ... #3C, #0E, #7C, #00 ; s
db #30, #30, #7C ... with a 0 byte though, so that's a WIN! ...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…
... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... the column
jp p, .ok
ld ... br /> ; it's not a literal, it's a quote
pop ... 60, #60, #60, #00 ; P
db #38, #6C, #C6 ... 66, #7C, #60, #60 ; p
db #00, #00, # ...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…
... e, a
inc c
ld a, (bc)
ld d, a
ld a, c ... the column
jp p, .ok
ld ... br /> ; it's not a literal, it's a quote
pop ... 60, #60, #60, #00 ; P
db #38, #6C, #C6 ... 66, #7C, #60, #60 ; p
db #00, #00, # ...I am selling hundreds of books & mags on E-bay.I hvae an auction on E-bay. I guess most of you will have seen it anyway.... It's not a specialist Spectrum auction. I am selling a few of my spare …
I hvae an auction on E-bay. I guess most of ... anyway....
It's not a specialist Spectrum auction. I am ... selling a few of my spare Spectrum ...T H E . B E S T . J O Y S T I C K . E V E RThe best joystick I ever had was the Emax Arcade Professional Big, BIG, massive thing just like the ones in the arcade... boy did that joystick tak…
... joystick, for responsiveness (is that a word?). But for flight games ...C, Z88DK and the Sprite Pack Library I wrote a short demo that shows a taste of what can be done from C on the Spectrum: [url="http://justme895.tripod.com/zqa/pacmen.zip"]http://justme…
... that shows a taste of what can be done from C on ... seamlessly integrate Z80 assembler into a C program. The 'turbo' mode (hold ... assembler in place of a block of C code in the hopes ... marginal (or maybe that's a good thing for C programmers!).
