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Dunny - help!I fired up SpecBAS, it automatically loaded the last program which was ASH2's background for the lander program. I pressed RUN and it ran fine then …
... PROGRAM MOONSCAPE
8 SCREEN WINDOW 1024,768
10 ... 25 FOR f=0 TO a: LET x=(INT(RND*9))*5 ... first
90 REM x and y = start position of blob
... INC y,1
530 LET x=x+1
535 GO TO ... fuzzy and did I want to use the original settings. ... -
PAPER&INK: screen/character differenciation?So I was looking at a type-in listing earlier and I got to wondering how the Spectrum differenciates between knowing that the PAPER/INK commands need…
... plot position moving [b]x[/b] horizontally and [b]y[/b] vertically relative to ... had perhaps by setting the screen ink/paper colours permanently then ... fall out of the screen. Might be something to play about with ... -
Matchpoint ball algorithmAnyone has any idea how Psions Matchpoint ball algorithm works? Are they calculating the balls' parabola (floating point for just the ball doesn't se…
... if x, y, z is in range 0-256 the isometric position of ... , 10) would be drawn at screen position (128, 138) and the shadow ... ).
That assumes the Y = 0 is at the bottom ... though but to go from the top left ... (0, 0) you just do y = 256 - y -
Strongest aspect of Spectrum BASICWhat would you say is the strongest aspect of Spectrum BASIC compared to other BASICs on other micros at the time. I think it might have been the Fun…
... going to POKE somewhere into the Spectrum's screen memory. ...
This is believed to have been corrected for the ... value of X in this FOR X=0 TO 63 line, ... is the maximum horizontal PLOT position on a ZX81. For ... is the maximum vertical (‘Y’) value for a ZX81 ... -
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…
... point it to an off screen buffer and copy that to screen if you ... br /> ; blit 8 pixel row to screen
ld a, (de)
; blit 8 pixel row to screen
ld a, (de)< ... an 8x8 sprite arbitrary x, y position
; hl = pointer to 8 bytes graphic ... -
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…
... point it to an off screen buffer and copy that to screen if ... 8x8 sprite arbitrary x, y position
; hl = pointer to 8 bytes graphic ... /> ; blit 16 pixel rowdata to screen in cells at column C ... /> ; blit 16 pixel rowdata to screen in cells at column C ... -
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…
... br /> ; clamp player to this minimum Y pos (pixels)
... br /> ; clamp player to this maximum Y pos (pixels)
... )*8
; clamp player X to this minimum row (character cells ... position is still where it used to be (middle of screen) which needs to ... -
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 to an off screen buffer and copy that to screen if ... This is way too slow to draw to screen every frame
BOX_TEST ... 8x8 sprite arbitrary x, y position
; hl = pointer to 8 bytes graphic ... /> ; blit 16 pixel rowdata to screen in cells at column C ... -
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 to an off screen buffer and copy that to screen if ... This is way too slow to draw to screen every frame
BOX_TEST ... 8x8 sprite arbitrary x, y position
; hl = pointer to 8 bytes graphic ... /> ; blit 16 pixel rowdata to screen in cells at column C ... -
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 to an off screen buffer and copy that to screen if ... This is way too slow to draw to screen every frame
ATTRIBS ... 8x8 sprite arbitrary x, y position
; hl = pointer to 8 bytes graphic ... /> ; blit 16 pixel rowdata to screen in cells at column C ... -
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…
... point it to an off screen buffer and copy that to screen if you ... br /> ; blit 16 pixel rowdata to screen in cells at column C ... y-coord
; c = pixel x-coord/8
; XORs graphics onto screen ... a horizontal line at any x position
; length may be ... -
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 to an off screen buffer and copy that to screen if ... This is way too slow to draw to screen every frame
ATTRIBS ... 8x8 sprite arbitrary x, y position
; hl = pointer to 8 bytes graphic ... /> ; blit 16 pixel rowdata to screen in cells at column C ... -
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…
... 8x8 sprite arbitrary x, y position
; hl = pointer to 8 bytes graphic ... /> ; blit 16 pixel rowdata to screen in cells at column C ... /> ; blit 16 pixel rowdata to screen in cells at column C ... /> ; blit 16 pixel rowdata to screen in cells at column C ... -
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…
... current scr_out position and update scr_out position
; C = character code to display ... />
; erase last char written to screen
unputc:
ld hl ... string at current scr_out position
; HL = pointer to string
puts ... -
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…
... current scr_out position and update scr_out position
; C = character code to display ... />
; erase last char written to screen
unputc:
ld hl ... string at current scr_out position
; HL = pointer to string
puts ... -
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…
... scr_out position and update scr_out position
; C = character code to ...
; erase last char written to screen
unputc:
ld hl ... , #3C, #66, #66, #00 ; X
db #66, #66, #66 ... , #18, #18, #18, #00 ; Y
db #7E, #06, #0C ... -
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…
... scr_out position and update scr_out position
; C = character code to ...
; erase last char written to screen
unputc:
ld hl ... , #3C, #66, #66, #00 ; X
db #66, #66, #66 ... , #18, #18, #18, #00 ; Y
db #7E, #06, #0C ... -
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…
... current scr_out position and update scr_out position
; C = character code to display ... />
; erase last char written to screen
unputc:
ld hl ... string at current scr_out position
; HL = pointer to string
puts ... -
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…
... line
\t moves output position to next multiple of TAB_WIDTH (has ... screen and homes the cursor
\b moves cursor back a position ... />
; erase last char written to screen
unputc:
ld hl ... -
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…
... scr_out position and update scr_out position
; C = character code to ...
; erase last char written to screen
unputc:
ld hl ... , #3C, #66, #66, #00 ; X
db #66, #66, #66 ... , #18, #18, #18, #00 ; Y
db #7E, #06, #0C ... -
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…
... scr_out position and update scr_out position
; C = character code to ...
; erase last char written to screen
unputc:
ld hl ... , #3C, #66, #66, #00 ; X
db #66, #66, #66 ... , #18, #18, #18, #00 ; Y
db #7E, #06, #0C ... -
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…
... scr_out position and update scr_out position
; C = character code to ...
; erase last char written to screen
unputc:
ld hl ... , #3C, #66, #66, #00 ; X
db #66, #66, #66 ... , #18, #18, #18, #00 ; Y
db #7E, #06, #0C ... -
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…
... br /> ; erase last char written to screen
unputc:
ld hl ... tokenizecharorquote:
push hl ; remember position of '
; char literals ... #3C, #66, #66, #00 ; X
db #66, #66, #66 ... #18, #18, #18, #00 ; Y
db #7E, #06, #0C ... -
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…
... br /> ; erase last char written to screen
unputc:
ld hl ... tokenizecharorquote:
push hl ; remember position of '
; char literals ... #3C, #66, #66, #00 ; X
db #66, #66, #66 ... #18, #18, #18, #00 ; Y
db #7E, #06, #0C ... -
AY musicThis is a format I'm proposing for an AY music player. If anyone can see any problems or anywhere it can be improved please say so. An AY music form…
... - decrease tone every x frames by y depth
7 ... - 4bit rate 4bit x tones 4bit y tones - alternate between ... return to stream position, 1bit on, all streams are moved to this position, ... - depth
Arpeggio 1byte - x+y semitones
Vibrato and Arpeggio ... -
ArtistryIn my younger days (and to a certain extent, now) I was always intrigued about how the loading screens were constructed. Back then I'd assumed it was…
... I was still no closer to making anything that looked remotely ... PAINT x,y,c1,c2
...where x and y are coordinates to start ... painting from, c1 is the colour to ... the entire screen, unless there's a blue border to make ...
