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Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
simple plot:
[CODE]
call 022B0h;A=y,c=X
inc a
ld b,a
xor a:scf
bwlp:rra:djnz bwlp
or (hl):ld (hl),a
[/CODE] -
Dock's ZX Maze gameI'm hoping to finish a simple maze game in ZX Spectrum BASIC this week, as part of the Ludumdare Retro challenge. I used to dabble in speccy basic on…
... : LET k=k+j2: LET x$=c$(s,c):
IF ... ,k): PRINT z$;INK 5;x$: POKE 23729,r: POKE 23728 ... -
Dock's ZX Maze gameI'm hoping to finish a simple maze game in ZX Spectrum BASIC this week, as part of the Ludumdare Retro challenge. I used to dabble in speccy basic on…
... : LET k=k+j2: LET x$=c$(s,c):
IF ... ,k): PRINT z$;INK 5;x$: POKE 23729,r: POKE 23728 ... -
Drawing a dotted line...Hi Folks, I cannot be the first person to want this (?) so here goes! Does anyone have a MC routine that does the same as the BASIC DRAW command bu…
...
plot x,y
Calculate next pixel address
plot x,y
over 1
plot x,y
over ... -
Drawing a dotted line...Hi Folks, I cannot be the first person to want this (?) so here goes! Does anyone have a MC routine that does the same as the BASIC DRAW command bu…
... pattern
20 PLOT 255,0: LET X=-255: LET Y=175 ... : GO SUB 500
30 PLOT ... 255,175: LET X=-255: LET Y=-175 ... 500
40 PLOT 127,0: LET X=0: LET Y=175 ... 500
50 PLOT 0,87: LET X=255: LET Y=0 ... -
Drawing a dotted line...Hi Folks, I cannot be the first person to want this (?) so here goes! Does anyone have a MC routine that does the same as the BASIC DRAW command bu…
... pattern
20 PLOT 255,0: LET X=-255: LET Y=175 ... : GO SUB 500
30 PLOT ... 255,175: LET X=-255: LET Y=-175 ... 500
40 PLOT 127,0: LET X=0: LET Y=175 ... 500
50 PLOT 0,87: LET X=255: LET Y=0 ... -
Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... [code]PRINT AT i,x;TAB x+w[/code]
If ... Row=";y,"Height=";h'"Column=";x,"Width=";w[/code]
x with PLOT.
[*]The TO ... ABS h: LET x=INT ABS x: LET w=INT ... =";y,"Height=";h'"Column=";x,"Width=";w
120 ... ABS h: LET x=INT ABS x: LET w=INT ... -
Change PAPER and BORDER colours from machine codeHow do you go about changing PAPER and BORDER colours from machine code? I've forgotten the system variables for border and paper.
Not sure how to do it in assembly, but...
Border: POKE 23624, x
Paper/ink: POKE 23693, x -
Change PAPER and BORDER colours from machine codeHow do you go about changing PAPER and BORDER colours from machine code? I've forgotten the system variables for border and paper.
... it in assembly, but...
Border: POKE 23624, x
Paper ... /ink: POKE 23693, x[/QUOTE]
Those system ... -
ProTracker manual/instruction in English?Hello. A friend of mine would like to start making AY music on ZX Spectrum. In this purpose he'd like to have a ProTracker's instruction/guide/manu…
... />
New options above v2.x:
√ Volume (global ... (click "Channel")
PT3.x can load Pro Tracker 2 ... .x, Sound Tracker, Sound Tracker Pro ... cumulation, volume increase/decrease, envelope mask
are in Edit smp ... -
Plane confusing...Nowhere near as exciting or complicated as one of Morkin's quizzes, but... Can you work out which game's loading screen was loading into which of ZX …
... , you can set a "write mask" for CPU writes to memory ... you can set the write mask to b1010 and a write ... the ROM's print and plot routines would still work (in ... -
Plane confusing...Nowhere near as exciting or complicated as one of Morkin's quizzes, but... Can you work out which game's loading screen was loading into which of ZX …
... , you can set a "write mask" for CPU writes to memory ... you can set the write mask to b1010 and a write ... the ROM's print and plot routines would still work (in ... -
Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
...
This BASIC routine can "PLOT" (using POKE) to any point ... +1): LET l$=b$(x+1):
LET loc ... :
LET bit=x-8*INT (x/8)+1:
... RETURN
[/code]
'x' range is 0 to +255 ... two statements convert the x,y coordinates into a ... -
Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
... assembler route and write a PLOT *x,y command that called a ... modify the POKE *x,y command into a PLOT *x,y command.
Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
... method makes it possible to PLOT within a PRINT statement, ... PLOT
;Syntax: FLASH x=y+USR Plot191
;where x= ...
ld a,(23677) ;A =x
and %00000111
ld ... :
LET bit=x-8*INT (x/8)+1:
LET ...Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
... "... x=(y+16)+USR ...".
[code]
;Full Screen PLOT, Y ... =0 to +191
;Syntax: FLASH x=y+USR ... ; B,C=ABS y,ABS x; D,E=SGN y,SGN ... x
ld (23677),bc ;(COORDS)= ...ZX-Assembler file handling concept[QUOTE=clausjahn;777075]Dear readers, At this time, it's a good time to ask you, the future users, how to implement the file usage. Let's suggest so…
... for Windows or Mac OS X [url="https://www.python.org ... recommend version 2.7.x, but 3.4.x should work too ... because existing tools could do X and couldn't do Y ... of calls and jumps, including assembly of most
of SjASM ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... coordinate
; l = valid character x coordinate
;
; exit : hl ... 't be calculating a new plot address for each point but ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... value of Y coordinate, the X coordinate runs over all its ... Y coordinate. L : valid character X coordinate
;OUTPUT: HL = address ... 't be calculating a new plot address for each point but ...BLOG- ZXSporgBasic RPG development thread- Inspired by the Spectrum 30 show, and after a six-month wait while I was busy playing loads of gigs, I have decided to do a spot of Spectrum coding…
... make it more straightforward to plot as INVERSE 0 or 1 ...ZX81 and Analogue TVsI recently bought a really nice ZX81 on ebay in amazing condition, but I'm having issues tuning in an old analogue TV to lock onto the signal. I und…
... boards use a green solder mask. However, there may be ... either two 18-pin 1k x 4 bit SRAM chips ( ... making a total of 1k x 8 bit = 1k byte) ... number of manufacturers for the mask ROM, and sometimes used EPROM ... / had been made using mask ROMs that had the faulty ...Kempston mouseHas anyone got code to work with an emulated Kempston mouse? There seems to be some conflicting information in the internet on which bits are reset w…
... />
[code]
10 LET x=IN 64479
20 LET ... /> 25 PRINT AT 0,0;x;" ";y;" "
30 IF IN ... IF IN 64223=254 THEN PLOT x,y
50 GO TO ...Fast Condition TestingHello my friends, I have been writing some input and string handling routines in BASIC lately - yeah I could write them super fast in C/ASM via z88d…
Early thoughts about creating a text adventureSo I always wanted to create my own ZX Spectrum text adventure. I tried looking at PAWs and GAC, but frankly I'm probably too stupid to use them. I…
... writing systems (including FORTH and Assembly language:o) and ultimately, I ... (similar to a list of PLOT and DRAW commands in BASIC ...Snowfall effectHow do you go about creating a snowfall effect like the one in Yeti? Now don't laugh, I'm currently printing 32 UDG's of dots OVER the top of my gam…
... ;arrive with IX addressing x,y, return with HL ... br /> rlca ; divide x by 8 and multiply by ... .
and 224 ; mask off bits we don't ... /> ld a,(ix+0) ; x coordinate.
rrca ; only ...Snowfall effectHow do you go about creating a snowfall effect like the one in Yeti? Now don't laugh, I'm currently printing 32 UDG's of dots OVER the top of my gam…
... ;arrive with IX addressing x,y, return with HL ... br /> rlca ; divide x by 8 and multiply by ... .
and 224 ; mask off bits we don't ... /> ld a,(ix+0) ; x coordinate.
rrca ; only ...Snowfall effectHow do you go about creating a snowfall effect like the one in Yeti? Now don't laugh, I'm currently printing 32 UDG's of dots OVER the top of my gam…
... ;arrive with IX addressing x,y, return with HL ... br /> rlca ; divide x by 8 and multiply by ... .
and 224 ; mask off bits we don't ... /> ld a,(ix+0) ; x coordinate.
rrca ; only ...64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... /> [CODE]; -----------------------------------------------------------------------------
; Plot 4x4 colored pixel on screen ... b, $f8 ; mask INK color
rr ... ld b, $c7 ; mask PAPER color
oddcol ...64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... /> [CODE]; -----------------------------------------------------------------------------
; Plot 4x4 colored pixel on screen ... b, $f8 ; mask INK color
rr ... ld b, $c7 ; mask PAPER color
oddcol ...
