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Getting scr addresses from x and yCould someone please tell me how to calculate the 8 screen addresses corresponding to a character printed in basic at coordinates x and y? For examp…
... 8 screen addresses corresponding to a character printed in basic at coordinates x and y ... ?
For example:
10 let x=15: let y ... -31 and y between 0 and 21. What would be the formula to calculate ... -
Calculating screen address to alternative ATTR area?I'm using this small snippet of code to convert a screen address to an attribute cell address... [CODE]AttrDE: ld a, d ; get the hig…
... of code to convert a screen address to an attribute cell address...
... ;
rra ;
and 3 ; keep lower 3 bits ...
RRCA
AND 3
OR 58H< ... -
General purpose full screen input routineHi Folks, One of the things that annoyed me back in the 1980s with most BASICs was the lack of a full screen "formatted" input function. You could …
... />
[LIST]
[*]Full screen input at X and Y
[*]Length of input ... can be restricted
[*]Ability to ... a real World implementation to reduce size and increase performance. Please note ... -
Loading a screen in to memory...Hi Folks, I want to load a SCREEN$ in to memory and save it out to RAM disk without it being displayed on the screen. I am worried about over writi…
... to load a SCREEN$ in to memory and save it out to ... br /> [CODE]100 LOAD “SCREEN” CODE RAMTOP+1,6192
110 SAVE !”SCREEN” CODE RAMTOP+1,6192 ... /> Where RAMTOP is the address held in the equivalent System ... a simple [B]LOAD!"SCREEN" SCREEN$[/B] or does the ... -
Reason for strange display layout?I have always wondered if there is any technical reason behind the strange layout of the display file or why did Sinclair choose to do it this way?
... use the SP to access pre-calculated "address of first line ... ", you still have to add the X position ... calculates table address from X and Y. So, don't need to bother about X position ... - applied at the whole screen you have saving of 192 ... -
Key repeat weirdness with EI & IYI finally (after 35 years!) decided to write something a) for 48k speccy b) in z80 assembler. It's been over 20 years since I've written anything in …
... was a) the speccy screen memory layout and b) that z80 ... routine that draws 16x16 sprites to x and y coordinates. This must be ... have "ld iy, SCREEN" which seem to cause the problems whenever ... in between going to sauna, drinking and going to the local animal ... -
Lesser used BASIC commandsAre there any interesting articles or books that explore some of the lesser used BASIC commands/functions e.g. DEF FN, IN, OUT etc? The Spectrum BAS…
... keys QAOP to move a character around the screen, increasing/decreasing X and Y values ... /> IF inkey$="q" AND y>0 THEN LET y=y-1 etc
LET y=y-(Inkey$="q" AND y>0)+(Inkey$="a" AND y0)+(Inkey$="p" AND x -
pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…
... if you rewire it to connect directly to X and Y connectors in your +2A ... power, GND, control and address lines from the computer to appropiate places in ... to wire address pins A8 to A15, and A0. Control signals to wire are IORQ and ... -
pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…
... if you rewire it to connect directly to X and Y connectors in your +2A ... power, GND, control and address lines from the computer to appropiate places in ... to wire address pins A8 to A15, and A0. Control signals to wire are IORQ and ... -
General purpose full screen input routineHi Folks, One of the things that annoyed me back in the 1980s with most BASICs was the lack of a full screen "formatted" input function. You could …
... Folks,
Hard to believe it is 18 months ... functionality:
[LIST][*]Full screen input at X and Y
[*]Length of ... input can be restricted
[*]Ability to ... all the tricks I know to boost speed (although I ... -
BASIC games on GameBoy Advance emulators? Possible ???Does anyone know is there any way to make ZXAdvance or FOON play BASIC games ? The game I want to convert is my own game which I quickly reprogramme…
... scaling turned on to X and Y you can see the whole screen including input ... -
SpecBAS really needs a manual!That Word doc that I converted to an RTF for you Dunny and ASH-II, is still somewhat sparse. I spent bloody hours PLOT/DRAWing a landscape to steer m…
... to draw it - using WINDOW PUT GRAPHIC gfx-id,window-id,x,y ... the main screen is 0. X and Y are the coordinates you want to place ... can be drawn to as if they were the screen and they can ... be rotated and scaled as desired ... -
Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... a mixed up mapping of X coordinates (0..31) mixed up ... a mixed up mapping of Y coordinates (0..23) mixed up ... does map numbers 0..767 to X and Y coordinates in a mixed up ... on its own, map the X,Y outputs through the two arrays ... -
Map to screen address problemCan anyone help me out with what I guess is a screen address calculation problem. I need to calculate the screen address of a tile based on a number…
... a screen address calculation problem.
I need to calculate the screen address ... of a tile based on a number from 0 to ... when I have to calculate for the other screen thirds.
... code snippet to do this. I?ve tried and got confused. -
New Manic Miner Remake written in AGK Basic and available on Mac OS X and Windows.<div style="font-weight: normal;">Hi,</div><div style="font-weight: normal;"><br></div><div style="font-weight: normal;">I've released a re-write of …
... is available for OS X and windows, and uses Andy Nobles ... loading screen, the game will show you how to complete ... it in one life. and if ... you have a forwarding email/address you can share?
and when my day job ... -
z88dk Spectrum Screen Driver problemHi guys, I've been messing around with z88dk a bit and was trying to output some stuff to the screen. Reading the docs, it says that I can use the Z…
... a bit and was trying to output some stuff to the screen. Reading ... use the ZX screen driver to set the x and y coordinates of the ... text I want to ... and 0x20 after my screen clearing routine in order to set the screen to ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... table for the char address, and will work at ... LD A,(YOFFSET) ; Get Y Offset
LD E, ... />
WRITECHAR:
; C = X, L = B, DE = GFX
; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
LD A,H ... -
Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H ... DE) ; Get Mask
AND (HL) ; And With HL
LD (HL ... Priorities: Mask, Char line, Y char, X char
;Attributes: No ... -
Zaf-forth to Z80 compiler Build 5This forth like complier is changing almost every day with new items been added. Here is a new Zaf-forth word add it the sptword.fth file - which is…
...
procedure zxcircle ;"x y r zxcircle to screen"
int zxcirclex ;
to the screen"
;"random sizes abd random x and y"
;"prints 8 spaces to screen"
."Random ... zxcircle
;"put x, y, and r on stack call circle ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... means to draw flicker-free and smoothly animated sprites and backgrounds on screen.
screen address calculations have been added to the standard zx ... sprite rotation to minimize colour clash.
7. X-thresh and Y-thresh ... -
What's wrong with this code ?OK, working my way through Jonathan Cauldwells 'How To' tome and I can't get the following to run in either spin or basin. ( iused the assembler in b…
... .
ld hl,blocks ; address of user-defined graphics data ... /> call 3503 ; ROM routine - clears screen, opens chan 2.
to x coordinate.
ret
; Set up the x and y coordinates ... -
Repton ManiaHi all, I am the creator, and look after, the Repton Resource Page ([url]www.reptonresourcepage.co.uk[/url]). For the site, I have written a freely …
... table into the screen memory (0x4000 to 0x57FF & 0x5800 to 0x5AFF)
screen from,X,Y,screen to,X,Y,0x00) co-ordinates are x=(X-12)div 4;y=(Y-24 ... /> The x and y co-ordinates are worked out (from the memory address):
why am i getting b integer out of range in this code?ive tried running this in spin but thats what i get [code]main org 40000; ; We want a black screen. ld a,71 ; white ink (7) on black paper (0…
... graphics.
ld hl,blocks ; address of user-defined graphics data ... /> call 3503 ; ROM routine - clears screen, opens chan 2.
; Initialise ... 1 to x coordinate.
ret
; Set up the x and y coordinates for ...this code wont give me a random starfieldim using a peice of code that ive copied from a book, ignore most of it as it is redundant. for some reason i get a strange random starfield instead …
... graphics.
ld hl,blocks ; address of user-defined graphics data ... /> call 3503 ; ROM routine - clears screen, opens chan 2.
; Initialise ... 1 to x coordinate.
ret
; Set up the x and y coordinates for ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... is ok and return so we can print sprite to screen
...
; Print next char and move to next char line
CALL ... Screen Address
; BC preserved
; Example X=20,Y=10 (This address ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... is ok and return so we can print sprite to screen
...
; Move to next column, and wrap horizontally if need ... Contains Screen Address
; BC preserved
; Example X=20,Y=10 (This address ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... A,(YOFFSET) ; Get Y Offset
LD ... br /> WRITECHAR:
; C = X, L = B, DE = GFX< ... /> ; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A, ... Get Mask
AND (HL) ; And With HL
...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... A,(YOFFSET) ; Get Y Offset
LD ... br /> WRITECHAR:
; C = X, L = B, DE = GFX< ... /> ; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A, ... Get Mask
AND (HL) ; And With HL
...
