-
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…
... hl
Loop0a: push bc ;octal digit counter (within ... t ...
push bc
ld b,3 ... ex de,hl
push hl
sbc ...
EndLoop:pop bc
push de
ld ... -
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…
... section from PUSH BC to POP BC becomes:
[code]
push bc
ld ...
ex de,hl
push hl
sbc hl,de ... ;DE=LHS address
pop bc
[/code] -
IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
... /> [CODE]
L0038: PUSH AF
PUSH HL
push bc
ld b ...
djnz loop
L0048: PUSH DE
[/CODE] -
A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... 0
ld bc,$0501
ld de,$0002 ... put the starting address in bc
inc hl
push bc
pop hl ; I move ... the starting address from bc to hl
and ... paginar:
di
ld bc,32765
ld (BANKM),a ... -
array offset (z88dk)Im trying to simulate a 2 dimensional array by using an offset [code] #include <fzx.h> char scr[768]; int arrayoffset(char x,char y) { return (x*…
The macro will work but it's like inlining code -- it will lead to a larger code footprint, which is what slenkar was trying to reduce.
If code footprint is important you can modify the macro to call a function to compute the index instead -- ... -
What Spectrum projects (Software/Games/Utility)(Hardware)(Others) are you working on?So, basically that :) You dont have to give names or more clues if you dont want to ;) Also, if you are working on more than one, you can tell all of…
... e = char c
; bc = uint n
;
... z
push hl
ldir
bc
pop de
pop hl
push hl
push ... de
push bc
push af
Isometric GamesAs a longer term project I'm thinking of attempting an isometric game, along the lines of Alien8, but with Magic Knight. No promises though, because …
... that Ultimate redraw the whole screen every frame - that would be ... redraw chunks into a full screen buffer and then copy the changed ... chunks to the main screen.
This would be a ...A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... 5 and 6
push bc ; columns 3 and 4< ... columns 17 and 18
push bc ; columns 15 and 16< ... columns 25 and 26(*)
push bc ; columns 25 and 26< ...A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... 5 and 6 (*)
PUSH BC ; columns 5 and 6
PUSH BC ; columns 19 and 20
EXX
PUSH BC ; columns 13 and 14< ... 25 and 26 (*)
PUSH BC ; columns 25 and 26
A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... 5 and 6 (*)
PUSH BC ; columns 5 and 6
PUSH BC ; columns 19 and 20
EXX
PUSH BC ; columns 13 and 14< ... 25 and 26 (*)
PUSH BC ; columns 25 and 26
A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... 0
ld bc,$0501 ; open file
... put the starting address in bc
inc ... I preserve the index
push bc
pop hl ; I ... the starting address from bc to hl
... br /> paginar: di
ld bc,32765
ld (BANKM),a ...Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... cycle + 1
push bc
jp FirstDE[/color]< ... br /> LOOP10:
push bc
ld a,e< ... 5b00)
push de
ex de,hl ... br /> SKIPDE: pop bc
dec bc
ld a,b ...Colission detection problems.G'ah...it's always the same (I've asked before too) - I'm always struggling when it comes to doing box colission checks, so I'm basically hoping you …
... table
DELSHOT PUSH BC
PUSH HL
DEC B
POP HL
POP BC
RET Z
INC ...Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
...
pop de
pop bc
pop af
exx ... /> push bc
push de
push hl
exx
push af
push bc
push ... de
push hl ...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... /> [CODE]print_tile:
push bc ; temporarily store BC
call get_screen_location
New bicolour game: El Stompo.Phew! Finally finished my first game using Einar's fantastic Nirvana engine. [B]El Stompo.[/B] [IMG]http://i1142.photobucket.com/albums/n608/davey…
... 5 and 6 (*)
PUSH BC ; columns 5 and 6
PUSH BC ; columns 19 and 20
EXX
PUSH BC ; columns 13 and 14< ... 25 and 26 (*)
PUSH BC ; columns 25 and 26
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…
[QUOTE=joefish;765476]So, your screen buffer is in linear order instead ... of Spectrum screen order? Good move.
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…
[QUOTE=joefish;765476]So, your screen buffer is in linear order instead ... of Spectrum screen order? Good move.[/QUOTE]
screen to the display area, while ...Fuller AY only gamesThe definitive list: 1) Demonstration Tape 2) Bodysnatchas 3) Star Bike
... /> ld de,$5c00
ld bc,801
ldir ;restore fuller ... /> ld a,b
push bc
ld bc,$fffd
out (c ... ),a
ld bc,$bffd
ld a,(hl ... /> out (c),a
pop bc
ret[/CODE]
30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
... put 19,18 )
push bc ;170 (put 17,16)
exx ;174
push ix ;189 (put 15,14 ... (put 11,10)
push bc ;222 (put 9,8 )< ... 10-11,12-13 shown) push hl ;+272,280 (put ... 14-15,16-17 shown) push de ;+288,296 (put ... 18-19,20-21 shown) push bc ;+304,312 (put 25, ...30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
... /> ; 16043T
PUSH BC ; columns 16 and 17 ... /> ; 16200T
PUSH BC ; columns 24 and 25 ... /> ; 16097T
PUSH BC ; columns 16 and 17 ... /> ; 16258T
PUSH BC ; columns 24 and 25 ...Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... video memory into its own screen buffer and generates a SCART-compatible ... a second or even third screen. As a minimum it should ... be able to place its screen address at least on any ... />
Being able to double-buffer the display (like [I]SPECTRA ...30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
... and 19
; 16043T
PUSH BC ; update columns 16 and 17 ... and 27
; 16200T
PUSH BC ; update columns 24 and 25 ... and 19
; 16097T
PUSH BC ; update columns 16 and 17 ...Sorting BusinessThis is a little bit different from the usual game-related fare but I know there are a few people here who like this sort of thing. This is about so…
... i
push bc ; save size
push bc ; save size< ... size
push hl ; save k
... size
pop bc ; bc = size
pop de ...Sorting BusinessThis is a little bit different from the usual game-related fare but I know there are a few people here who like this sort of thing. This is about so…
...
add hl,bc
push hl ; save array_hi + 1
push hl
insert_loop:
; de = j
; bc = ... ;= array[j-1]
push bc
call asm0_memswap ; swap(j ...displaying all memory activity in a screenDunno why I keep thinking about this, but here goes Is it easy enough to add a screen to an emulator that shows every memory address' activity.... …
... games where the off-screen buffer is for screen data. Starion is of ...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…
...
EXX
POP BC
PUSH BC
JR L_24DF
... L_24DB: LD C, A
PUSH DE ...
EXX
POP BC
L_24DF: ...automatic relocating of non-relocatable codeI was pondering upon the problem of changing absolute addresses used by CALL, JP, etc. when code is moved, without reassembling at the new location; …
... br /> here equ $
ld bc,here-init
sbc hl ... ,bc ;'here' = init =start of ... /> ld c,l ;BC='here' or 'init'
push bc ; store for later ...
