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Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…
... code for the pre-shift table sprites demo. To save ... see if the shift table approach would be fast enough compared to ... /> and 7
jp z,put_sprite1
jp put_sprite2
;
call z,p_at
jp put_blanksprite2
;
;
... -
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
... value by decrementing it
jp m, CHK_AT ; expecting a regular ... BELOW:
;
; CODE #1: FAST "COMMA" (jump to next column ... -
BUZZSAW+ Demo No. 3Right, another demo of BUZZSAW+. [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_3.tap"]Joefish_Buzzsaw_Demo_3.tap[/URL] The default con…
... of memory, and an interrupt table in the page below that ... A,0', 'CP 0' and 'JP' and swapping them for 'XOR ... the sprite routine run as fast as possible. But it works ... -
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…
... be to change the address table so I can remove the ... ; LDI * 22 times
jp pe,scroll_loop ; 10, 382 ticks ... !!!
[/CODE]
The table itself will be taking up ... that bit of code as fast as it can possibly be ... -
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…
... .
[CODE];Simple and fast plot/draw demo (assembles as ... br /> JR NC,dod1 ;jp if positive dir
DEC ... br /> JR NC,dod2 ;jp if positive
DEC E ... 256 ;find correct bit in table
LD C,A< ... -
PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…
... when you try write really fast draw routine, you probably ... and 7 ; 7
jp z, draw1 ; 10
... ld l, a
jp nc, draw1
ld ... br /> if i remember correctly, table driven PLOT routine can't ... -
Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... and copy it as fast as
possible. ... ; high byte of vector table
ld i, a ... ld (endcall), hl
jp blit ; call blit
... push af
defb 0xc3 ; jp endcall
endcall:
vector:
jp im_main ; jump to main ... -
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 …
... for character moving sprites, fast screen dumping for platform ... games, or for fast text editing within an ... float over there in a table, in terms of:
... fast is it?
So one can look at this table ... /> ld a,r
jp p,NextChar
im 1 ... -
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 …
...
out (254),a
jp (ix)
;
block equ ...
org 65024 ;vector address table
REPT 257 ;jumps to ... next game (16 rows very fast but very restricted graphic choices ... -
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 …
... br /> It implements a "table lookup" routine, used when ... I do do similar for fast simultaneous keypress detection.
jp partition
partition_done:< ... lo)
jp while_lohi ; do left side
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…
... operates slightly differently. A table of pointers is maintained, ... match ; found character
jp po, notfound ; n exceeded
dec e
jp nz, loop ; nope, still ... Today, large caches and fast processors have made it possible ...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…
... byte), but using the direct JP instructions for loops and a ... optimizations.
[CODE]setup fast jump ld ix,rptaddr DD21XXXX ... 06XX ;Hi Byte of Lookup table
Scr_add ld hl,#4000 ...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…
... now.
[CODE]setup fast jump ld ix,rptaddr DD21XXXX ... 06XX ;Hi Byte of Lookup table
Scr_add ld hl,#4000 ...clear a windowed area of the screenHi everyone! Ain't been on here for donkeys, but have recently started messing around with a little game. I'm looking for ideas/opinions on the bes…
... ]You could build a lookup table for each row and point ... is %11 (ie. 3)
jp nz,LOOP1 ;then A will ... , I bet it's very fast.Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…
... />
[code]
; h = shift table
; de = sprite def (mask ...Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…
... code is and then change table addresses to labels inserted into ... file. Same goes with regular jp or jr instructions. Dealing with ... above were original output as "jp" by sdcc but the peepholer ... not to make the program fast but to make it small ...Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…
... can index them i.e. JP addr = 1, DJNZ displacement ... page and use this table to convert instruction to ...
It should be fast enough since I only have ... dynamic instructions such as JP HL. I thought I ... HL,DE ; add 100
JP (HL) ; and jump
...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... vblanks to see how fast the code runs
table (next address = current address ... /> ld e, l
jp sprite8x8caAlwaysLookupRow
.notaligned
...
inc c
jp sprite8x8caAlwaysLookupRow
ret
...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... vblanks to see how fast the code runs
table (next address = current address ... /> ld e, l
jp sprite8x8caAlwaysLookupRow
.notaligned
...
inc c
jp sprite8x8caAlwaysLookupRow
ret
...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... vblanks to see how fast the code runs
table (next address = current address ... /> ld e, l
jp sprite8x8caAlwaysLookupRow
.notaligned
...
inc c
jp sprite8x8caAlwaysLookupRow
ret
...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... vblanks to see how fast the code runs
table (next address = current address ... /> ld e, l
jp sprite8x8caAlwaysLookupRow
.notaligned
...
inc c
jp sprite8x8caAlwaysLookupRow
ret
...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... the next address from the table (next address = current ... /> ld e, l
jp sprite8x8caAlwaysLookupRow
.notaligned
... br /> inc c
jp sprite8x8caAlwaysLookupRow
ret
... br /> Mice move pretty fast I heard? Obviously it needs ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... vblanks to see how fast the code runs
table (next address = current address ... /> ld e, l
jp sprite8x8caAlwaysLookupRow
.notaligned
...
inc c
jp sprite8x8caAlwaysLookupRow
ret
...ZX Spin 0.4 available for Download.Standard Cut-n-Paste from the CSS post: If all goes well, I'll upload it to WOS on monday. ----------------------------------------- Okay, it's th…
... /> v0.4 - OpenGL and Seriously fast tapes
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Added ... it out. Might need a fast PC though.
Altered the ... editor
Fixed an interrupt table overwrite bug in the z80 ...INVASION OF THE BODY SNATCHAS - Obscure High score table messages...After posting a message about this game on the 'first three games you bought' section, I got thinking more about this game. When you typed certain m…
... messages onto the high-score table on this game, it would ...Z80 Emulator Source?Found a link to this on comp.sys.amstrad.8bit. i havent been with the discussion long but supposedly this is the source for a Z80 emulator. Forgive m…
... hl,hl ;hl=84xxh
jp (hl)
fetchend:
.ds ... - fetchend
;instruction jump table
jumpb .equ 0c3h ...
