-
zxasm.net facebook group - COMPO #6 – 256 byte game compo – THE RESULTS !!!The results of the last compo are in. All entries include the source code. [img]http://zx-speccy.co.uk/Copy2WebServerData/2016716_12380.png[/img]…
... /2016/07/16/compo-6-256-byte-game-compo-the-results/"]zxasm ... /2016/07/16/compo-6-256-byte-game-compo-the-results/[/url ... -
Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... hl,&4000 ; first display byte
ld de,&57ff ... ; last display byte
ld b,revtab/256
loop:
halt
defs (-$)%256 ; 256-byte align
revtab:
defb & ... -
A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
...
[code] align hi($)==hi($+8) ? 1 : 256[/code]
256-byte boundary. If that’s not ... /> inc l ;advance to next byte (make sure sprite data is ... ;else, load A with high byte of screen address
sub ... -
An MC question (sorry, there's no MC forum to post to!)Ok, still struggling with learning MC - but am getting there. I just can't find anywhere on the web / in books that explains how to do arrays in MC.…
...
add a,MyArray%256
ld l,a< ... you align MyArray to the
; start of a 256-byte page ... evenly
; divisible by 256 so that, in 16
ld h,MyArray/256
ld a,(hl)< ... example above, sz=1 byte so no multiplication was necessary ... -
Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
... up SP. If you align copybuf on a 256-byte boundary, you could ... -
Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
copybuff is aligned on a 256 byte boundary ;)
I align nearly everything. The sprite records and guardian instances are the only buffers that aren't aligned I think (would need to check). -
Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... a 256 byte table around with me.
Just remember to align ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... 8 of them - each of 256 bytes holding the numbers 0 ... . And if you align the tables on 256-byte boundaries you can select ... with the high-byte, and load the low-byte with the value ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... can believe in 256 byte alignments (there's an align compiler directive for ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... can believe in 256 byte alignments (there's an align compiler directive for ... -
HELP!I'm trying to replace a bit in a byte as follows, but having some sort of brain freeze trying to get it to do what I want. A=00 if bit to replace …
And if you align your sprite data (i.e. make sure it doesn’t cross the 256-byte boundary), you can use INC L instead of INC HL, which is two T states faster. -
Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
... a variable for each stored byte. Just label the beginning of ... /> If you align the buffer address to a 256-byte boundary, 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…
... tbl_scraddr be aligned to a 256 byte boundary
adc h ; ... /> ld l, b ; low byte of hl is now the ... br /> ALIGN 256
; screen address table. This must be 256 byte aligned< ... + #17e0
; 16 byte buffer for drawing graphics which ... -
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…
... /> ORG ($+255)&#FF00
;ALIGN 256 pasmo doesn't like this ... address table. This must be 256 byte aligned
tbl_scraddr dw SCRBUF_BASEADDR ... -
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…
... tbl_scraddr be aligned to a 256 byte boundary
adc h ... tbl_scraddr be aligned to a 256 byte boundary
adc ... /> ALIGN 256
; screen address table. This must be 256 byte aligned ... #17e0
; 16 byte buffer for drawing graphics which ... -
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…
... bytes graphic data. MUST BE ALIGN 32
; l = pixel ... tbl_scraddr be aligned to a 256 byte boundary
adc h ; ... here since 16x16 spreites are align 32
inc e ... /> ; 16x16 graphics. align to 32 byte boundary
ALIGN 32
gfx16x16_ball ... -
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…
... bytes graphic data, Must be ALIGN 32
; l = pixel ... tbl_scraddr be aligned to a 256 byte boundary
; store l ... won't overflow here since align 32
inc l< ... a
ret
ALIGN 256
tbl_rows dw SCRBUF_BASEADDR + #0000 ... -
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…
... tbl_scraddr be aligned to a 256 byte boundary
adc h ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... /> ALIGN 256
; screen address table. This must be 256 byte aligned
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…
Which version of sprite8x8a are you using?
The data needs to be align 8 as well since it assumes the data does not cross a 256 byte boundary.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…
... tbl_scraddr be aligned to a 256 byte boundary
adc h ... tbl_row be aligned to a 256 byte boundary
; store ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... br /> ALIGN 256
; screen address table. This must be 256 byte aligned
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…
... tbl_scraddr be aligned to a 256 byte boundary
adc h ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... /> ALIGN 256
; screen address table. This must be 256 byte aligned
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…
... causes that DJNZ will repeat 256 times
.loop1< ... /> ret
ALIGN 64
; modify this ... /> jr outloop
ALIGN 32
; HL ... /> ; 16x16 graphics. align to 32 byte boundary
ALIGN 32
gfx16x16_wall ...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…
... be aligned to a 256 byte boundary
adc ... be aligned to a 256 byte boundary
adc ... /> ALIGN 256
; screen address table. This must be 256 byte aligned< ... + #17e0
ALIGN 256
gfx16x16_player0 db %01111110, %00000000 ...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…
... tbl_scraddr be aligned to a 256 byte boundary
adc h ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... /> ALIGN 256
; screen address table. This must be 256 byte aligned
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…
... table must not cross a 256 byte boundary and must have less ... have
[code]
ALIGN 256 ; this is safest but 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…
... bytes graphic data. MUST BE ALIGN 32
; l = ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... here since 16x16 sprites are align 32
inc ... bytes graphic data. MUST BE ALIGN 32
; l = ... since 16x16 sprites are align 32
inc ...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…
... /> ALIGN 256
; screen address table. This must be 256 byte aligned ... SCRBUF_BASEADDR + #17e0
ALIGN 256
gfx16x16_player0 db %01111110, %00000000 ... 00000001, %11111110
ALIGN 256
; line type, operation, prevy ...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…
... bytes graphic data. MUST BE ALIGN 32
; l = ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... here since 16x16 sprites are align 32
inc ... bytes graphic data. MUST BE ALIGN 32
; l = ... since 16x16 sprites are align 32
inc ...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…
... br /> ALIGN 256
; screen address table. This must be 256 byte aligned
ALIGN 256
IF 0
gfx16x16_player0 ... /> db %00000001, %11111110
ALIGN 256
; line type, operation, prevy ...Mode 2 Tile Editor SourceA Timex Mode 2 Tile Editor incorporating a byte mirror table. The compiled version is available in the CSSCGC 2008 collection from the WoS archive. …
... br /> ld hl,$4508 ; 11th byte
call expand_byte ;
... br /> ld hl,$4608 ; 13th byte
call expand_byte ;
... br /> ld hl,$4708 ; 15th byte
call expand_byte ;
... ; ------------
;
; A 256 byte lookup table to mirror the ...
