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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 ...Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…
... 8-bits (apart from the screen address). It's doing something different ... diagonal the width of the screen and 2/3 the height ...Drawing LinesHas anyone got any experience of coding a Bresenham line drawing algorithm on the Speccy? I've had a go and I find the algorithm has quite a few s…
... , I'm holding onto the screen byte until the loop either ... not read/writing to the screen once for every pixel.
screen address (only when required) rather than ...50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... to push these to the screen.
It is working ... br /> ld sp,(spstore2) ; Load screen address to push to
; Self ... modified push to screen
buffer: defs 15 ;< ... ld (spstore2),hl ; Store last screen positon
jp fl_bus ; Repeat ...How to store and recall a "window"?I would like to memorize and then restore a rectangular portion of a screen, pixels and attributes. To make things easier, this "window" would be sit…
... :
' souceaddr: memory address of source block to copy ... /> ' destaddr: memory address of destiny block to ... address sorce and destination to restore the top third of the screen ... you want) whitout calculating screen address in high resolution
What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
... Table of screen line addresses, ie the address of the ... br /> To fetch a line address, you could use something like ... the top of the screen.
ADD A, ... B,(HL)
RET ; screen address returned in BC
LNUM ...What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
... alterations to the way a screen address is fetched as below.
screen.
LD L,A
LD B,(HL)
RET ; screen address returned in BC
LNUM ...ZX Spectrum EmulatorsI'm putting together a (hopefully) comprehensive list of all ZX Spectrum emulators available for the new WoS site. Obviously we'd like the latest …
I seem to remember some emulators allow to edit ROM, but [b]would it enable a coder to instantly change, say, the screen address?[/b]
Is it possible for NEXT or other hardware?
TYZX Spectrum EmulatorsI'm putting together a (hopefully) comprehensive list of all ZX Spectrum emulators available for the new WoS site. Obviously we'd like the latest …
... to instantly change, say, the screen address?[/b]
Is it ... />
TY[/quote]Change the screen address? Can you clarify what you ...ZX Spectrum EmulatorsI'm putting together a (hopefully) comprehensive list of all ZX Spectrum emulators available for the new WoS site. Obviously we'd like the latest …
... means changing the start of screen address, so the first byte drawn ... to screen is from 16400 instead of ... can do it), but that address is fixed on ZX Spectrum ...ZX Spectrum EmulatorsI'm putting together a (hopefully) comprehensive list of all ZX Spectrum emulators available for the new WoS site. Obviously we'd like the latest …
... means changing the start of screen address, so the first byte drawn ... to screen is from 16400 instead of ... can do it), but that address is fixed on ZX Spectrum ...ZX Spectrum EmulatorsI'm putting together a (hopefully) comprehensive list of all ZX Spectrum emulators available for the new WoS site. Obviously we'd like the latest …
... doesn’t involve changing the screen address. There is a lot of ... , 8x turbo speeds, multiple stacked screen layers with variable priority, 9 ...ZX Spectrum EmulatorsI'm putting together a (hopefully) comprehensive list of all ZX Spectrum emulators available for the new WoS site. Obviously we'd like the latest …
... means changing the start of screen address, so the first byte drawn ... to screen is from 16400 instead of ... can do it), but that address is fixed on ZX Spectrum ...ZX Spectrum EmulatorsI'm putting together a (hopefully) comprehensive list of all ZX Spectrum emulators available for the new WoS site. Obviously we'd like the latest …
... means changing the start of screen address, so the first byte drawn ... to screen is from 16400 instead of ... can do it), but that address is fixed on ZX Spectrum ...What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
... ASM routine to fill the screen with a checkerboard background - as ... filling one third of the screen or a depth of 8 ... that doesn't need any screen address tables and is relocatable
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…
... on involving rendering to the screen. I thought at first it ... is writing to the screen with the screen address in the 'hl' register ...How to write a simple C+asm horizontal scrolling game (Tutorial, z88dk)[b]How to write a simple C/asm horizontal scrolling game[/b] [b]Note:[/b] This tutorial has multiple parts... I am still writing but this first pa…
...
void __CALLEE__ print_uchar(uchar *address, uchar c)
{
... This function returns the screen address, given its y and ... code, find the address of that character in ...
void __CALLEE__ print_uchar(uchar *address, uchar c)
{
...Textured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…
... time and it computes a screen address for every pixel visited. ... pixels and it uses screen addresses rather than pixel ... from "00010000" into a screen byte "11000100". ANDing the ... and "10000000" respectively. The current screen address is modified to move up ...Fighting Warrior's protection systemThis is one of those bizarre cases where cracking the loading system is orders of magnitude more fun than playing the game. (Indeed, discovering I wa…
... bytes off tape for a screen address, then 8 bytes for that ... the attribute. This allows the screen to be drawn in a ... .
3) After the screen is loaded, the remaining bytes ... takes the code hidden on screen, puts in the top of ...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…
... ) ; e = low byte of screen address
inc hl ; hl points ... screen address
ld d, (hl) ; d = high byte of screen address ...
ex de, hl ; hl = screen address of ... add hl, de ; adjust screen address for col
ld b ...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…
... ) ; e = low byte of screen address
inc hl ; hl points ... screen address
ld d, (hl) ; d = high byte of screen address ...
ex de, hl ; hl = screen address of ... add hl, de ; adjust screen address for col
ld b ...
