-
Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…
... rom and no circuit diagram. Fast forward to today and you ... /> codeblock: ; jump table
jp volume_0
jp volume_25
jp volume_50
...
jp table to the next volume subroutine ... -
Code structureHi all, I'd be interested in opinions on the neatest way to do this. I've got a print string routine in which 0-31 are reserved for control codes, …
... >31 printable ASCII
jp c,control_code
...print char ... br /> ...jumps to routine in jp table based on contents of accumulator ... But each routine ends with JP PRINT_STRING so the next byte ... lots of routines end in JP rather than RET.
... -
IDE-media only Spectrum games?A similar discussion is taking place at Speccy.org's forums, but I thought it was worth to start the topic here. Now that we have several IDE interfa…
... could be provided by a JP table.
The difficult bit is ... extended basic (OPEN # etc.), the JP table will not be important (from ... -
IDE-media only Spectrum games?A similar discussion is taking place at Speccy.org's forums, but I thought it was worth to start the topic here. Now that we have several IDE interfa…
... could be provided by a JP table.
The difficult bit is ... -
mea culpa!I have just sent Digital Prawn another entry for CCG 2008 which might shock a few people! It is a program which emulates a Commodore Vic 20 - yes, yo…
... his ideas on implementing a fast jump table. I'd never have ... -
Bug fixing woesGaahhhh! I've spent an afternoon off work agonizing over why my routine didn't work. It's something I'd already restarted so didn't want to wipe th…
... /> [code]
CP 0
JP dothis
CP 2
JP gohere
CP 15
JP gothere
[/ ... 't a Z after the JP. Cursed a bit, then ... you consider changing to a JP table? If I'm still developing ... know, I usually do a JP table so I'm not bound ... -
Code structureHi all, I'd be interested in opinions on the neatest way to do this. I've got a print string routine in which 0-31 are reserved for control codes, …
... BTW you can implement jump table with SMC, using a 256 ... br /> ld hl,(jump_table)
jp (hl)
jump_table:
... /> This is amazing!!!!
My JP table was already 256 aligned, but ... need that style of jump table to redraw the screen, ... -
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 …
... /> IF FLAG IS 1, FAST COPY BUFFER TO SCREEN
JP MAIN
RET
TABLE WITH
LD BC, ... br />
ORG 0FDFDH
JP MAINLOOP
... -
LINE-routine and other nice pieces of codeThe line-topic came in the end with a nice piece of fast coding. I think that there might be more of these routines out there (where-ever-u-r). Isn…
... with a nice piece of fast coding.
I think ... I coded
this super fast decisiontable (if someone finds a ... H,B ; point H to table (4)
.......LD L,A ... /> JP IFD ; last (#8300-#83FF)
Total memory for table 1K ... -
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 …
... /> HALT
JP MAIN
RET
TABLE WITH
LD ... )
CP 0
JP Z,INTEND
ORG 0FDFDH
JP MAINLOOP
Tips on optimizing some newbie assembly routinesI'm starting to learn some assembly language. The best way to learn is to actually code something you are going to use, so I'm creating a very simple…
... the render as fast as I can. ... and attribute) and the table of characters (named _MB23_tileset ... br /> inc c
jp _b1a
... /> inc c
jp _b1b
._b1bok
Fast LogsAnyone know of a fast ln function I can steal? The ROM function seems to be hideously slow. I wrote a look-up table dirty and less accurate sin func…
Anyone know of a fast ln function I can steal? ... /> I wrote a look-up table dirty and less accurate sin ...fast font engine possible?inspired by the recent "proportional font" thread for zx basic and ideas for gui and having done some of the work on this in the past i wonder if it …
... table of widths (1 byte per character width). this would enable fast ... then there would be no table of widths.
... . width of 16 pixels
— (table of char widths)
byte ... experience ... do you believe ultra-fast draw_text could be made using ...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 ...High score table routineI wrote this general purpose high score table routine. It stores 5 scores and displays them alongside the player names, which are 8 characters long. …
... TEMP
JP INSER ; proceed to the insertion ... (TEMP),HL
JP INSER
NEW_4:
JP INSER
NEW_3:
table header
CALL PRINT< ...Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…
... byte.
- I think the fast width loop could be unrolled ... /> ; calculate destination offset (from lookup table)
ld l,9 (ix ...
dec -7 (ix)
jp NZ, rowloop
ld sp ...Who want to remake Double Dragon?Seeing as the Speccy version was crap (see my review: [url="http://www.gamestyle.net/retro.php?article=31"]http://www.gamestyle.net/retro.php?article…
fast vertical scrolling:
di< ... +1), sp
ld sp, table line start
ld bc ...
inc sp
jp pe, next_line
restore_sp ...My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... using table of pre-calculated attribute values. It's pretty fast (just ...
LDI move attribute from table to vram
; ... even more.
JP PE,LOOP loop until bc ... br /> ; example of table....
ORG $XX00 Table starting at "nice" ...My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... using table of pre-calculated attribute values. It's pretty fast (just ...
LDI move attribute from table to vram
; ... even more.
JP PE,LOOP loop until bc ... br /> ; example of table....
ORG $XX00 Table starting at "nice" ...My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... have 8 tables. Each table transforms source attributes into ... other are 0
; table 2 - yellows becomes blue, ...
; .... etc
; table 7 - white becomes white and ... it, but it's fast. Note that you can ... IX
LDI
JP PE,LOOP
RET
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?
... ,8... to speed up execution. JP/JR instead of RET is ... (one line down) is very fast just 10T cycles.
table
LD A,_positionX ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... l,a ; 4
jp (hl) ; 4 8
The "fast" solution (58 bytes, 76 T ... l,(hl) ; 7
jp (hl) ; 4 15
... /> ret
table db t14&255,t15 ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... loop should be as fast as possible to reduce ... ; fetch remain start
jp (hl) ; jump remainroutine
... /> dec h ;
jp no-out ; H and A ... [/code]
The table must be placed at #80FF ... need to reset the table
directly after your ...A new Apple 1 emulator for the SpectrumHi all, I'm happy to announce a new Apple 1 emulator for the Sinclair ZX Spectrum! It's a port of Simon Owen's Apple 1 emulator for the SAM coupe to…
... /> ld h,table/256
ld h,(hl)
jp (hl)
org $7000
table: defb $71 ... /> org $7100
jp i00
jp i03
jp i06
etc ... few years to develop this fast routine)New assember ideaAs i work with Eclipse IDE in my job i become more and more lazy. This leads me to idea that it is time to left Notepad+Tasm combo behind and move on…
... should be a relocate table for every lib function ... br /> ld de,_heap
jp HeapSbrk_callee + ASMDISP_HEAPSBRK_CALLEE
ld de,_heap
jp HeapSbrk_callee + ASMDISP_HEAPSBRK_CALLEE
fast. And hence why ...Emulators on the ZX SpectrumHaving released a Spectrum 16K emulator for Spectrum 48/128 machines as part of CCG2008, I was wondering if anybody knows of any emulators which actu…
... Advantage: I can swap fast between mainregisters and emulatorregisters ... ; Point to instruction in table
LD H,(HL) ... highbyte of instructioncode
JP (HL) ; Go to ...
EXX
JP (IY) ; Jump to BYTE1 ...Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…
... 's the outline for a fast full screen vertical scroll:
table. To scroll in the opposite ... ix
dec a
jp nz, nextln
ret
dec a
jp nz, nextln
ret
Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…
... 's the outline for a fast full screen vertical scroll:
table. Faster & less memory to ... , why you wrote 16440 in table? Mistyped?
[quote]
dec a
jp nz, nextln
ret
When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers
[QUOTE=Metalbrain;399421]Fast flag using bit 7 (that ... /> Beeper:
ld hl,(FXPointer) ; table pointer
ld a ... br /> ld hl,(FXCode)
jp (hl) ; beeper effect till interrupt ...Midi out on a ZX SpectrumYears ago (may be over 15 years...) I soldered a small adapter that lets a keyboard or synthesizer connect to the ZX Spectrum 128K's midi/RS232 port.…
Well, there were several situations in the past that I wanted to use midi on the Spectrum with.
1. I used the Midi out port on a ZX Spectrum 128K heatsink model to send data to a Yamaha Cs1x for my first laserharp.
That laserharp had ten ...
