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tricks to simplify codingWhen i started with programming in assembler i had very simple approach to do things. Just shifting bytes around, doing simple tests and so... Later …
...
LD H,B ; B = constant, start of table highbyte
LD H,(HL) ; Fetch ... ]
The jump table is 1K in size, 256 bytes for highbyte ... , 768 bytes for 256 JP NN instructions starting with ... -
Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... ;
; ld a,"X"
; ld bc,99*256+10 [Y Value ... Display Characters]
; ld h,0
; ld l,a
; ... /> ;
; ld bc,99*256+10
; ld hl,xxxx
ld a,b
cp ... use a look-up table to set the Screen ... -
'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…
... addresses from 61*256 up to (64*256)-1, contain ... from address (60*256) instead of from (61*256).
table is at 88-90, ... address of the bitmaps)
ld h, a
... bitmap in ROM crosses a 256-byte boundary.
< ... -
Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …
... />
[code];H=Y,L=X
LD A,H
AND 7 ... A,L
LD L,A
LD A,H
RRA
OR #58
LD H,A
;HL=address[/code ... speed, you have to use 256-byte aligned table. -
Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... />
SCRWTH equ 256 ; Screen width in pixels
ld h,0
add hl,de ; HL points into sprite frame table ... defw 16384+(32*0)+(256*1)
defw 16384 ... +(32*0)+(256*2)
defw 16384 ... +(32*0)+(256*3)
defw 16384 ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... ;
;sound id points to table of sounds where are stored ... boundary of 256
ld (beep_ptr), hl
ld hl, ...
.ALIGN 256
beep_buf
.WORD ... ld r, a
ld l, e
ld h, d
ld ... -
Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... />
SCRWTH equ 256 ; Screen width in pixels
ld h,0
add hl,de ; HL points into sprite frame table ... defw 16384+(32*0)+(256*1)
defw 16384 ... +(32*0)+(256*2)
defw 16384 ... +(32*0)+(256*3)
defw 16384 ... -
Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... />
SCRWTH equ 256 ; Screen width in pixels
ld h,0
add hl,de ; HL points into sprite frame table ... defw 16384+(32*0)+(256*1)
defw 16384 ... +(32*0)+(256*2)
defw 16384 ... +(32*0)+(256*3)
defw 16384 ... -
Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... LPRINT routine in the CHANS table to point to
;the ... /> CRADR: DEFW font-352 ; was 256
WIDTH: DEFB 0
LD H,A
LD L,E
LD A,(ATTRP)
LD (HL ... -
binutils questionSince there's a few people using binutils these days I thought I'd give it a go and see whether it solves my hunt for a replacement assembler/librari…
... write MSB to from a table....
;
... :
LD HL, SomeAddress
LD A,H
LD (SetSomeAddressMSB + ... 1), A
RET
....
; LD A, SomeAddress / 256 ... -
binutils questionSince there's a few people using binutils these days I thought I'd give it a go and see whether it solves my hunt for a replacement assembler/librari…
... such as dividing it by 256. This is always done ... dynamic indexing into a table at fixed address. It ...
[code]
; enter: a = table index, tbl = int[]
256
ld l,a
ld a,0< ... br /> adc a,tbl/256
ld h,a
[/code]
binutils questionSince there's a few people using binutils these days I thought I'd give it a go and see whether it solves my hunt for a replacement assembler/librari…
... dynamic indexing into a table at fixed address. ... /> [code]
; enter: a = table index, tbl = int[]
256
ld l,a
ld a,0 ... /> adc a,tbl/256
ld h,a
[/code ... in the generated assembler: "ld hl,(struct_base_address + offset)". ...New game: WUNDERCHAR$Hi All, Finally finished my latest game: Wunderchar$. [IMG]http://i1142.photobucket.com/albums/n608/daveyboyhughes/loadingscr.gif[/IMG][IMG]http://…
... LD L, value1 / LD H, value2 / LD (addr), HL - i would use LD ... HL, value1 + value2*256 ... managed to work with jump table, if i understand your ... a
ld l, a
ld h, 0
ld de, level_tab< ...New game: WUNDERCHAR$Hi All, Finally finished my latest game: Wunderchar$. [IMG]http://i1142.photobucket.com/albums/n608/daveyboyhughes/loadingscr.gif[/IMG][IMG]http://…
... / LD H, value2 / LD (addr), HL - i would use LD HL, value1 + value2*256 instead ... managed to work with jump table, if i understand your code ... screen from my screen address table (not using a screentab was ... was either using the index table or the stack pointer. I ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... /> LD A, SKIP_RLC-END_LOOP+256
LD A, INIT_RLC-END_LOOP+256
; offset in streams table
ret
... 32)/2) - 1
ld h, b ; now HL = char
RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... address
; offset in streams table
ret
rra
ld a, 256-(END_LOOP-SKIP_RLC) ; instruction DJNZ ... ) - 1
ld h, b ; now HL = char
Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... hl ; Store H before calculating
ld h,0
ld l,a< ... ; ASCII code in L
ld h,0
add hl,hl ... are reading the char-set table from the ROM, valid ... Store HL before calculating
ld l,(hl) ; ASCII code in ...Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... will use a set of 256 tiles.
... ASCII code in L
ld h,TILESETADDR/2048
add hl ... straight in and as LD A,(DE) takes exactly ... to change the address table so I can remove ... /> [/CODE]
The table itself will be taking up ...line, plot and circle in whole 256x192 displayhi! are there some way to draw lines, or whatever, in the whole 256x192 display, than just the above 256x176 part? (this is the msx1 version i made o…
... Y
LD H,L ;H=0 now
LD L,E ; ... ;screenaddr-Lo
LD A,H
LD H,B ;now HL = ... LD B,pixtable/256 ;find correct bit in table
LD C,A
LD ...Pixel engines for explosions...Hi... Iv a strange request... I was toying around with an old YS program, which can be found here: [url]http://www.users.globalnet.co.uk/~jg27paw4/ty…
...
L61722: LD D,H
LD E,H
DEFB 38; LD H,
INSERT1 ... )
LD (INSERT2),A
JP START
DEFS (-$)%256 ; This ...
SCR_TABLE: ; SCREEN ADDRESS TABLE NOW FOLLOWS IN HEX:
Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
... the setup
ld h,rotation_table_to_use
ld l,0 ; sprite byte ...
; h = remnant rotation table MSB
; l = ... br /> inc h ; switch rotation table to current table
ex ... to a 256-byte boundary then each table occupies an ...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…
... character graphics
ld h,0
ld l,a ;hl = ... start of character table
ld d,0
ld e,c ... = row address in table
ld e,(hl)
inc ... row address fetched from table
ld a,b
... ;next byte of screen, +256
djnz loop ;repeat ...Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... ]start:
ld a,$40
ld l,$00
ld (exit+1 ... routine as follows:
[CODE] ld h,a
REPT 7
256 addresses insert an extra address ... map and 26*256=6656 bytes for each UDG table. Total execution ...Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... either need a look-up table to find the start of ... ,DE correction rather than the LD H,A ; INC L version, just ... fit 10 characters into a 256 byte page instead of only ...Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... either need a look-up table to find the start of ... ,DE correction rather than the LD H,A ; INC L version, just ... fit 10 characters into a 256 byte page instead of only ...Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…
... how you interpret the relocation table(s).
Patrik[/QUOTE ... ,#(_pmem_list)
adc a, h
ld h,a
... can only be at most 256 bytes in length).
... fixup value and the relocation table address being different, but ...Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…
... exx D9
ld h, hi_byte_tableaddr 26XX
ld l,a 6F< ... exx D9
ld h,hi_byte_tableaddr 26XX
ld l,a 6F< ... ex de,hl EB
ld a,h 7C
cp #58 ...
Create lookup table to 256 byte boundary (requires 256 bytes of free ...
