-
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…
... /> ELSE
FONTBASE EQU nice_font - 256
ENDIF
RETURN_TO_BASIC ... h, tbl_rows/256 ; address of the screen rows table page
; add ... /> ld h, (hl) ; second byte of table
add d ; add on ... -
Basic and AY musicis it possible to play an ay-music in background while a basic program is running?
... /> Also RST 38 is one byte compared to three for CALL ... register to look at table at HIGHBYTE * 256 then get IM2 vector ... as VECTOR *256 + VECTOR
; eg table contains B0, routine ... a suitable place for the RAMTOP - well that really depends on ... -
Huffman questionI'm pretty sure that the answer to my question is "no", but I just want a second opinion: Is it possible to somehow cram a Huffman decompressor + de…
... you used one byte per symbol in a table to record frequency ... table gives you 0.2% accuracy; if you can tolerate more error ... the 256 byte table can be shrunk. When ... -
Question about digitized sound and videoI searched the forums and couldn't find the answer, so here it goes. Regarding digitized sound: I remember reading an article long ago about a vid…
... all rather timing-critical and error checking was one of the ... to the screen or a 256-byte sound buffer, and stopping periodically ... . Similarly, you can make translation table from 8-bit to 4 ... -
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 your table ... -
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 …
... look-up table - or actually 8 of them - each of 256 bytes ... you align the tables on 256-byte boundaries you can select the table for ... the shift required with the high-byte, and ... 2K required by the shift table above.
[QUOTE= ... -
Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…
... ]
my stackptr is at RAMTOP , out of the way (but ... /> The im2 table needs to start on a 256-byte page, which means ... the table and 3-byte JP instruction, the table must start on a 256-byte ... page (LSB=0) and the table must be ... -
CMWC random number generator for Z80Seeing the interest regarding the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=23070"]Xor-Shift random number generator for Z80[/URL]…
... table%256
db 15
if (table/256)-((table+15)/256)
error "whole table must ... be within single 256 byte block"
CMWC random number generator for Z80Seeing the interest regarding the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=23070"]Xor-Shift random number generator for Z80[/URL]…
... somewhat faster version with table restricted to single 256 byte block:
...
rnd ld hl,table
... if (table/256)-((table+17)/256)
error "whole table must be within single 256 byte block"
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... whatever is available above ramtop in main memory. I ... umem.palette,256*4);
if (errno)
return error("%u: ... G/R/A * 256 after the 0x36 byte header
... (errno)
return error("%u: Error writing to output file",errno ...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 ; A ... ; low byte of hl is now the address of table at x ... ; low byte of hl is now the address of table at x ... section
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…
... /> ;ALIGN 256 pasmo doesn't like this
; screen address table. This ... must be 256 byte aligned
tbl_scraddr dw ...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…
... alignment
IF ASSEMBLER_SJASM
ALIGN alignment
ELSE
ORG ... you can just use low byte (e.g. INC L instead ... )
Aligning to 256: You can load the table address as LD ... H, tbl_addr/256. If the table is ...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 ... write it back
; push table address
push hl
table
ld a, ... /> ; 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…
... pixel, so uses a 48 byte table (24 rows * 2 bytes ... tbl_scraddr be aligned to a 256 byte boundary
; store ... inc l ; using shorter table (just the row screen addresses ...
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 ... tbl_scraddr be aligned to a 256 byte boundary
adc ... tbl_scraddr be aligned to a 256 byte boundary
adc ...
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_row be aligned to a 256 byte boundary
; ... 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…
... tbl_scraddr be aligned to a 256 byte boundary
adc ... tbl_scraddr be aligned to a 256 byte boundary
adc ... tbl_scraddr be aligned to a 256 byte boundary
adc ...
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 ... />
ALIGN 64
; modify this table to be based ... /> 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
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 ... tbl_scraddr be aligned to a 256 byte boundary
adc ... tbl_scraddr be aligned to a 256 byte boundary
adc ...
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…
... also better using a table for your level pointers, ... 2 bytes from a table into a register).
table must not cross a 256 byte boundary and ... from location from a table of 16 bit pointers ... />
[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 ... it back
; push table address
push hl
align 32
inc ... bytes graphic data. MUST BE ALIGN 32
; l ...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
gfx16x16_player0 db %01111110, %00000000 ... 00000001, %11111110
ALIGN 256
; line type, operation, ...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…
... the next address from the table (next address = current ... bytes graphic data. MUST BE ALIGN 32
; l ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... since 16x16 sprites are align 32
inc ... bytes graphic data. MUST BE ALIGN 32
; l ...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…
... [code]
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 ...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…
... /> ELSE
FONTBASE EQU nice_font - 256
ENDIF
RETURN_TO_BASIC ... h, tbl_rows/256 ; address of the screen rows table page
; add ... /> ld h, (hl) ; second byte of table
add d ; add on ...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…
... /> ELSE
FONTBASE EQU nice_font - 256
ENDIF
DBG_REST_OF_IBUFF ... h, tbl_rows/256 ; address of the screen rows table page
; add ... /> ld h, (hl) ; second byte of table
add d ; add on ...The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…
... 256 times
ld b,(hl) ; B = high byte ... byte in table
ld e,(hl) ; Fetch 'last' byte in table ...
prbyte ld a,(hl) ; Fetch byte for ... prbyte ; Print byte from screen
table defb 13,27 ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... address of the new 3072-byte attribute table.
[CODE]< ... once
ld bc, 256 ;Make 256 copies
ldir ;Thusly< ... /> ;Interrupts will go to 253*256+253 = 65021
;Copy ... go (253*256 + 253)
ldi ;Copy the 3-byte jump instruction ...
