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UDG in AssemblyHello there my fellow WoS'ers I am currently having a play with z88dk and PASMO and would like to have some fun with some UDG's so is there a tutor…
... address of your graphic character in HL. It then ... ,de ;hl = address of character graphic
push hl ...
char_rows ;character row address table
defw 16384, 16416, 16448, ... 23264
chars ;character graphics " ABC"
defb 11111111b ... -
UDG in AssemblyHello there my fellow WoS'ers I am currently having a play with z88dk and PASMO and would like to have some fun with some UDG's so is there a tutor…
... de, chars ;start of character graphics
ld h, ... de ;hl = address of character graphic
push hl ...
char_rows ;character row address table
defw 16384, 16416, 16448, ... 23264
chars ;character graphics " ABC"
defb 11111111b ... -
BIN2BAS (load BASIC text into emulator) utilityI've nearly finished testing this. It allows a BASIC program to be loaded from a text file in any emulator which has a "load binary" option. I was wo…
... that now the RANDOMIZE USR 16384 statement must be the last ... /> 1 411 jp $2669 ;process character code
2 418 jp ... $0716 ;ROM0;process character code
[/code] -
Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... below scroll a full 32 character line 2 pixels to the ... c,8
ld hl,16384
ld de,256-32 ... (23670),sp
ld sp,16384
ld c,8
Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…
... the background attribute for each character cell still remains the same ... />
right
ld hl,16384
ld c,192
display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... /8): REM Location of X character block
1120 LET yc ... /8): REM Location of Y character block
1130 LET yl ... RHS
1170 LET adr=16384+yl*256+l*2048+r ...SE BasicAfter 13 years of development I thought I'd run out of things to optimize, but it turns out I was wrong. However, I'm now running out of time to work…
... new functions.
[*]7-bit character support: UDG 1.
... [*]8-bit character set support: UDG 0.
16384: RESET.
[*]Lower 16K ... screen" 16384, 6976
[*]SCREEN$() supports UDGs and 8-bit character sets ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... 256 ; offest to ASCII character zero
ld (chars), ... cp 0x40 ; less than 16384?
ret c ; ... rst get_char ; else get character
cp ctrl_enter ; carriage ... txt" ; each message has last character inverted
...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... if not
ld bc, 16384 ; range limit
ld (t_addr), bc ; 16384 to t_addr
call find_line ... :
rst next_char ; next character
call expt_1num ; expect ... overflow
ld hl, 16384 ; line range is 0 ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> rst get_char ; get next character
cp ',' ; comma?< ... br /> ld de, 16384 ; max line number is ... ld hl, (mem_4_1) ; address next character
ret ; return
... hl ; point to next character
call stack_num ; ...Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…
... ,16384 : EXX then replace RST $10 with:
[code]
;print character ...Clearing 22 lines of the screenHow do I go about clearing the top 22 lines of the screen and leave the bottom #0 area untouched? I have a routine to reset the attributes, but cant…
...
[code]
LD HL,16384
LD DE 16385
character lines -
jr nz,.l0 ...ZX Spectrum code examplesThe shortage of sites with decent code examples seems to be few. The links to alot of sites that used to host them are disappearing into the ether. …
... of screen starts at 4000h (16384) and continues to 57ffh (22527 ... colours change in a whole character location. The value you poke ... in will change the character colours based on this layout ... next address being each next character location.
The ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... -7 within character square
add a, 64 ; 64*256 = 16384 = start ... /> ld d, a
; find character cell within segment
ld ... a, e ; 8 character squares per segment
rlca ...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.
... address of each character row. The first character is at 16384, then each ... the vertical position of your character, doubling it, and adding ... times - that multiplies the character by 8 and gives you ... in screen memory, within a character space, each byte is ...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.
... BASIC that POKEs from 16384 upwards with values of ... />
It starts at 16384 and comes in three 2K ... chunk, to move one character to the right you ... .
Within a character, to move down a pixel ... To move down a whole character (within a chunk) you ...ccZ80++Here is the url for a new compiler pour all computers with Z80: [url]http://ccz80pp.webcindario.com[/url] It's a beta version, but it's works. If y…
... a function to print a character square to the screen using ... )
LD HL,16384
LD A,B
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…
... -7 within character square.
add a,64 ; 64 * 256 = 16384 = start ... /> ld h,a
; Find character cell within segment.
ld ... a,l ; 8 character squares per segment.
rlca ...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…
... -7 within character square.
add a,64 ; 64 * 256 = 16384 = start ... /> ld h,a
; Find character cell within segment.
ld ... a,l ; 8 character squares per segment.
rlca ...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…
... -7 within character square.
add a,64 ; 64 * 256 = 16384 = start ... /> ld h,a
; Find character cell within segment.
ld ... a,l ; 8 character squares per segment.
rlca ...Peeking the contents on screen? How?You will have to forgive me for growing up on the C64, but I know I can peek the location of a character (1024 is top left from memory) and the peek …
... have character-mapped video RAM, so PEEKing in the display file (16384 ... . SCREEN$(row,column) returns the character at a particular screen location ...Peeking the contents on screen? How?You will have to forgive me for growing up on the C64, but I know I can peek the location of a character (1024 is top left from memory) and the peek …
... the ROM.
16384-32767 are the first 16K ... Now, the screen starts at 16384. There's 6K of ... the UDGs, or the entire character set.
Anyway ... do a loop from 16384 to 22527 and POKE ... the screen address of a character (or, technically, the ...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…
... /> ROW defb $00 ; Character row
COL defb $00 ... b,a ; from the character row/column
ld ... br /> DT_DRAW ld hl,16384 ; Start of display file< ...Assembler by Peker Computers Ltd.There are two entries at WOS: http://www.worldofspectrum.org/infoseekid.cgi?id=0024435 (MIA) http://www.worldofspectrum.org/infoseekid.cgi?id=100…
... save from start 0, length 16384 and hooked up the speccy ... very tedious. A 64-column character set like Tasword 2 would ...printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
... information. So for a standard character, that's one POKE per ... colours). So for a 8x8 character plus colour, that's 9 ... :-
[code]10 FOR a=16384 TO 22527
20 POKE ...printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
... coming up with a garbage character or lines or garbage. im ... trying to get the graphics character 'a' to display. i must ... POSITION
OK: ld de,16384
add hl,de
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…
... four times to fill one character row. The next repeats that ... or a depth of 8 character rows. Then finally the outermost ... 64000
ld hl,16384
ld a,3
