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<1…10111213141516…34>
  • Analogue BeeperThere's been a discussion on foro.speccy.org about multichannel beeper stuff, and since I had the camera out and the scope set up, I set about demons…

    ... port
    .loop
    ld hl, wave
    .makewave
    ld ... a, (hl) ; get delay value
    and ... zero level delay
    inc hl
    ld b, (hl)
    cpl
    inc hl ; next byte
    jp .makewave ...
    Winston Winston January 2009 Development
  • Speech reproduction on the Speccy - 2009 style?Thanks to Chapter 33 of [url="http://www.worldofspectrum.org/infoseekid.cgi?id=2000388"]Super Charge Your Spectrum[/url] by David Webb - "Speech Repr…

    Funny you should ask that, I did this on Sunday. But using true analogue output. Yes, your rubber keyed friend has a built in DAC. Bet you didn't know that :-) You can squeeze about 6 bits of resolution from it, too.

    See this thread: [url]http ...
    Winston Winston January 2009 Development
  • Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…

    ... ), sp
    ld hl, spp
    inc (hl)
    inc (hl)
    ld sp, (spp ...
    Winston Winston January 2009 Development
  • Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…

    ... built-in stack operations will INC/DEC the SP by two ... />
    In your code the INC (HL) simply manipulates the low-byte ... $FF prior to your double INC (HL)!

    Say your stored ... SP was $80FF - your double INC (HL) would change the value to ...
    Chris Pile Chris Pile January 2009 Development
  • Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…

    ... (or maybe LC C,(SP); INC SP; LD B,(SP)[/quote ... SP was $80FF - your double INC (HL) would change the value to ...
    rahtgaz rahtgaz January 2009 Development
  • Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…

    ... /> OR E
    LD (HL),A
    INC L
    [/CODE]
    POP HL
    LD A,(HL)
    INC HL
    PUSH HL
    OR ...
    Patrik Rak Patrik Rak January 2009 Development
  • New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…

    ... add hl,de
    ld (hl),a
    inc hl
    ld (hl),a< ... jr z, roadleft
    inc hl
    inc hl
    roadleft
    ld ... /> jr nz, checkright
    inc hl
    inc hl
    checkright
    ld ... /> ld (hl),a
    inc hl
    ld (hl),a
    inc bc ;add ...
    bigjon bigjon January 2009 Development
  • Thinking in Assembly (first efforts)The following is one small routine to educate myself on a few concepts (jumps, flow control, routines, CPI): [code]searchmem xor a …

    ... convenient way of increasing HL, decreasing BC and setting ... useful here!

    inc hl ;HL = HL + 1
    dec bc ... here!

    cpi ;HL = HL + 1, BC = BC -1 ... a convenient way to INC HL, DEC BC and check ...
    Chris Pile Chris Pile January 2009 Development
  • Assembler snippetsI was just thinking that a thread for small but useful assembler snippets to do useful things would be cool for people learning z80 coding. Not to me…

    ... tl1
    LD A,(HL) ; fetch #/50 sec ...
    PUSH HL
    LD C ...
    Dr BEEP Dr BEEP January 2009 Development
  • How does the Speccy deal with the Character Set?Hi All, Can anyone spare a little time to explain to me the basic Assembly method of how the Speccy interprets and retrieves Characters to print on …

    ... string in assembler is this. HL points to the first character ... ]

    .loop ld a, (hl)
    and a ; is A ... 16 ; print the character
    inc hl
    jr .loop
    [/code ...
    Winston Winston February 2009 Development
  • How does the Speccy deal with the Character Set?Hi All, Can anyone spare a little time to explain to me the basic Assembly method of how the Speccy interprets and retrieves Characters to print on …

    ... ;screen addr
    INC HL ;next pattern
    INC D ;next screen addr ...
    roko roko February 2009 Development
  • 128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…

    ... e,(hl)
    inc hl
    ld d,(hl)
    inc hl
    ex (sp),hl
    baze baze February 2009 Development
  • Interrupts - been a while !Not sure if this is the right place for this (1st post on WOS, but been a speccy user since Dec'84 :-o (yes I am that old ! :p) ), But I can't for …

    ... disable ints before calling
    ; hl = interrupt routine address
    ; ...
    ld (INTVECTOR+1),hl

    ld ... byte vector table
    inc hl
    djnz IntSet
    inc a
    ld (SpeedFlag), ...
    frobush frobush March 2009 Sinclair Miscellaneous
  • ** New Game In Development **As one or two of you may already know, Jonathan (Joffa) Smith is currently developing a brand new Spectrum game. The program is called 'SAUCER' It'…

    ... /> Loading from memory using the HL register pair - with auto increment ... />
    [code]
    ld a,(hl)
    inc hl

    ; becomes...
    frobush frobush April 2009 Games
  • 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 …

    ... do the printing
    ld hl,text2 ; the second textpart

    doprint ld a,(hl) ; fetch the next character
    inc hl ; point to next character
    HL) as mentioned before. After ...
    Dr BEEP Dr BEEP April 2009 Development
  • Simple text compressionI just checked one idea about text compression. Do not take it as recomendation but rather as info which can you save some time when you are solving …

    ... LD E, (HL)
    INC HL
    LD D, (HL)
    INC HL

    ; Save TreeBase
    LD (TreeBase), HL< ... /> EX DE, HL
    ADD HL, HL
    ADD HL, DE
    ... byte
    RR C
    INC HL
    Skip1:

    ...
    BloodBaz BloodBaz May 2009 Development
  • faster bitwise operators?well, sinclair basic lacks bitwise operators and I searched "basic forum" with keyword "bitwise" and only 3 thread came up. So the forum also lacks b…

    ... , (C) ;
    LD HL, SaveLoc ; HL=Memory location to dump key ... />
    loop1:
    LD (HL), C ; Memory Location = 0
    INC (HL) ; Memory Location = 1
    skip1:
    INC HL ; Move ...
    BloodBaz BloodBaz May 2009 Sinclair Basic
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... routine
    inc hl ; move HL up one address
    push hl ; save this ...
    ld (hl), 0x00 ; set
    inc hl ; font
    ld (hl), 0xcc ; address ...
    ld (hl), 0x80 ; set
    inc hl ; udg
    ld (hl), 0xd0 ; address ...
    chev chev May 2009 Development
  • Russian Translations...As i have once again been reminded (by the "Homebrew games" thread), there are some funky looking Russian games that I can't play due to not understa…

    ... /> LD DE,16744
    LD HL,English1

    CALL ...
    LD A,(HL)
    ;Increment pointer
    INC HL

    ; ... 256 (next screen row)
    INC D

    ;Next ... DE
    ;Next colmun
    INC DE

    ; Restore ...
    Digital Prawn Digital Prawn June 2009 Games
  • 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…

    ... /> ld (de), a
    inc d
    inc hl
    djnz _b2a
    ; Next cell...
    pop hl

    inc e
    jr nz ...
    Metalbrain Metalbrain June 2009 Development
  • Reading from the 128 Serial PortDon't shout at me if this is a silly question. I have Googled extensively, and searched the forums, but I can't find anything discussing what seems t…

    ... /> DEC DE ;accomodate the coming INC
    LD BC,239 ;port ...
    roko roko June 2009 Sinclair Basic
  • Interface One - New FunctionalityAs you may (or may not) be aware the Interface One is a pretty powerful piece of kit. One of it's greatest features is being able to easily extended …

    ... 28 02 $0c/$07ts
    inc hl ; 04a4 23 $06ts
    ld e, (hl) ; 04d8 5e $07ts
    inc hl ; 04d9 23 $ ... 06ts
    ld d, (hl) ; 04da 56 $07ts
    inc hl ... ; 04db 23 $06ts
    push hl ; 04dc e5 ...
    jp jp July 2009 Development
<1…10111213141516…34>

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