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Why doesnt this work???Simple piece of code wont do as it should, just want to fill the top 22 lines of screen with an attribute value (150) but it wont have any of it. Som…
... /> LD HL,22528 ; screen address
LD B,6 ... /> POP HL ; recall address
ADD HL,DE ... -
Best place to start learning assembly on WOS ?So I'm pretty new at this forum but not the Speccy so my BASIC is pretty good. I can see lots of resources on WOS for doing machine code/assembly but…
... like %0100010010000011(**) to formulate screen addresses from bit strings related ... the components of a screen address don't line up in ... characteristics like which column the screen address is in and which ... third of the screen the address is in. Not so ... -
I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…
... tries to print outside of screen. You can simply invoke your ... +2 to convert screen coordinates (row and column) to screen address. It's ... -
I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…
... LSB of the relevant relocatable address
If the ... logical operations on the relocatable address) then the linker does ... ).
If any address is absolute, ie it refers ... the binary like maybe a screen address or external section, then no ... -
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…
... A with high byte of screen address
sub 8 ;subtract 8 ... A with high byte of screen address
sub 8 ;subtract 8 ... -
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…
... A with high byte of screen address
sub 8 ;subtract 8 ... -
Project: ZX OpusHello my friends, I have been in need of a push lately so I thought if I post some of the work for this project here you guys (and gals) can help me …
... specific bit and display file address.
For pixels ... have a display file address inside a character square, ... the 16-bit attribute address is constructed from this ... "character Y,X to screen address" (screen address means the pixel area). That ... -
Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... messing about with calculating the screen address twice.
Currently that ... -
128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…
... in the remaining (ie non-screen) memory in bank 7. When ... you do the screen drawing you page in bank ... the high byte of the screen address. -
Beginner's z88dk help rqdI'm struggling to get my first z88dk C program to compile. My program is this: #include <spectrum.h> int main() { zx_border(INK_BLACK); } …
thanks the sp1 demo is pretty good actually!
seems new
is there a library that finds the screen address from coords 0-31x 0-23y? -
Beginner's z88dk help rqdI'm struggling to get my first z88dk C program to compile. My program is this: #include <spectrum.h> int main() { zx_border(INK_BLACK); } …
... a library that finds the screen address from coords 0-31x 0 ... /zx.h#L87"]display file address manipulators[/url].
[code ... /> cxy2saddr = "character x,y to screen address"
zsdcc generates very ... -
what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
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…
... ld hl,16384 ; Start address of screen block 1
call DPATTERN ... BIT pattern on screen
inc hl ; Increment screen address
djnz ...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…
... LD HL,16384 ; start of screen address
LD B,12 ... ; place it on the screen
INC HL ; ... ; place it on the screen
INC HL ; ...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…
... ld hl,16384 ; Start address of screen block 1
call DPATTERN ... BIT pattern on screen
inc hl ; Increment screen address
djnz ...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…
... /> ld hl,$4000 ;start of screen file
ld bc,$18 ... ),a ;pattern into screen address
inc hl ;next screen address
djnz loop ...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…
...
assembled to the required address (above 32768) and all 3 ... br /> HASH LD HL,MainScreen ; screen address
LD B,12 ; ... a ;pattern into screen address
inc hl ;next screen address
djnz ...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…
... , but loop to walk the screen column by column and row ... the ROM contents into the screen. This is just so it ... [8];
/* ...find the screen address of the character.*/
screen.
Try it in ...1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …
... mask bit for the screen and adjust the screen address Lo byte accordingly ...1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …
... pop hl ;restore buffer address
ret z ... :
push hl ;backup screen address
xor (hl) ;< ...im looking for a double size, height and width character programi want to be able to stretch and scale up udg's
... 4000 ;load DE with screen address
ld a,"X ...
;Fetch character bitmap address:
ld l, ... to get the base address of character
... ;bitmap addr into DE, screen addr into HL
... /> ;if font base address is a multiple of ...im looking for a double size, height and width character programi want to be able to stretch and scale up udg's
... 4000 ;load DE with screen address
ld a,"X ...
;Fetch character bitmap address:
ld l, ... to get the base address of character
... ;bitmap addr into DE, screen addr into HL
... /> ;if font base address is a multiple of ...Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... ;
inc h ;HL = address of mask bytes 0FAxx
screen address
ld d,a ;DE = stored screen address
... l ;point DE to screen equivalent ATTRs address
ldi ;copy ...Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... to stored screen address
ld d,a ;DE = stored screen address
... l ;point DE to screen equivalent ATTRs address
ldi ; ... br /> pop hl ;plasma address into HL
nxt_block:< ...Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... rewriting the Calculate Attr to screen address part from 10 to 8 ... de ;pushed DE = stored ATTRs address
ld a,d ...Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... knew calculating the screen address from the ATTRs address was so easy!
address
sll d
Fast Binary to Text DisplayI've done this thing that takes some memory contents and converts it to a Binary version of 0's and 1's on screen. However, I've no idea what to use …
... that starts at address $4000 and ends at address $5aff. Visually, ... the attribute area starts at address $5800. Instead of wasting ... can simply keep incrementing the screen address (held in the DE ...
Adding one to a screen address will move us one character ...Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... ;use L to create the SCReen address Hi-byte from the ATTRa ... ATTRs address
a2s_a:
ld a,(de) ;get byte from SCReen ... DE address
mlp1:
ld a,(de) ;get SCReen buffer byte ...Work out screen address from attribute cellAttribute cell 22529 is equivalent to PRINT 0,1 position value. Is it possible to obtain these two values from the number 22529 in a simple MC rou…
... can derive the ATTR address from the screen address (in HL)
address from screen address in HL
LD ... can also calculate the screen address (top scan of char ... ATTR2SCR equ $ ; Get screen address from ATTR address in HL
...Reading DEFB for backgroundsHi all I suppose the question is kind of silly but I'm a completely newbie with assembler :-S I'm drawing some side backgrounds with ZX Paintbrus…
... of code. Attribute address to screen address, and screen address to attribute address.
[code]aa2sa ...
