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<1…15161718192021…34>
  • smooth movement in basicWas trying to figure this out myself but i would like to be pointed in right direction now :-). How do I make something move in Basic without gettin…

    Out of curiosity I rewrote line 130 ... de ;D =sign of mx; E =sign of my
    pop hl ... ,h
    or a
    jr z,mxZero
    ld a,b ... ,l
    or a
    jr z,myZero
    ld a,c ...
    Battle Bunny Battle Bunny October 2012 Sinclair Basic
  • Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …

    ... /> 1070 LET z(zy,3)=z(zx,1)*z(zx,1)
    LET z(zx,4)=z(zx,4)-z(zy,2):
    z(zx,3):
    LET z(zx,3)=z(zx,3)+z( ... version doesn't have any out-of-bounds checks, by the ...
    This "32-bit signed integer math routines" page is very ...
    Battle Bunny Battle Bunny November 2012 Development
  • Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …

    ... t managed to find out how to set it ... 1" and a crash out to BASIC. The routine ... /> [CODE]
    ;
    ; Output of Messages
    ;

    . ... FF?
    jr z,msgecc ; yes, end of control codes
    jr msgpcc ; next control ...
    snigfarp snigfarp November 2012 Development
  • Code execution logging/profilingAs revealed in [url="http://www.worldofspectrum.org/forums/showthread.php?t=41666"]this thread[/url], I'm adding support for reading code execution l…

    A snippet of SpecEmu log output:

    [ ... OUT (#FE),A
    8477 61221 JR NZ,#8490
    8490 61233 JR Z ... OUT (#FE),A
    8477 61317 JR NZ,#8490
    8490 61329 JR Z ... appear at start and end of the file. Then comes hex ...
    Metalbrain Metalbrain December 2012 Emulators
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... )

    #define MAX_OFFSET 2161 /* range 1..2161 */
    int count_bits ... , $10
    call rbits
    jr z, ofdone
    bit 3, e ... a, (hl) ; load another group of 8 bits
    inc hl ...
    antoniovillena antoniovillena January 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... /> [CODE]
    #define MAX_OFFSET 2160 /* range 1..2160 */
    ...
    void ...
    antoniovillena antoniovillena January 2013 Development
  • Converting games to disk: difficult loadersThis thread has an spanish version in foro speccy, but I haven't gathered enough information to overcome my problems. I've been converting some game…

    ... of the block of code (before NOP's). Look out for this piece of ... code.[code] EI
    CALL 654
    JR Z ... the address at the end of the loader. At 24046 is ... you'll see a few of these calls.[code] LD A ...
    FrankT FrankT January 2013 Games
  • Checksum routine wantedI wish to make a program that verify integrity of a Multiface 1 ROM. It is possible to compare each byte of the ROM against a binary dump, but this i…

    ... the ROM with an accuracy of 255/256.

    However ... the top bit across a range of 8 bytes, it has only ... a 50% chance of detecting the error.[/QUOTE]
    jr z,loop
    ret[/CODE]
    Einar Saukas Einar Saukas February 2013 Development
  • Memory diagnostic toolIs there any sort of memory diagnostic tool for examining .Z80 files so I can easily identify large areas of blank memory? Scrolling through ZX Spin…

    ... lists addresses for areas of 175 consecutive zeroes between ... /> VALAT: equ 23679 ;start of (value) block
    VALUE ... ld bc,$7ffd
    out (c),a
    ei ... /> cp (hl)
    jr z,NOT1ST
    inc hl< ...
    Battle Bunny Battle Bunny February 2013 Development
  • Relocating a block of code as to work on a 16k spectrumI've written a game in from 50000 to 65535 and was wondering if there were any way to relocate the entire block of code to work on a 16k Spectrum. I…

    ... which, as has been pointed out, it wouldn't ... ... ;HL=actual runtime location of ADJUST
    ld de ...
    or l
    jr z,GET_SP

    add ... ex de,hl ;HL=address of location to change
    ...
    Battle Bunny Battle Bunny February 2013 Development
  • Multiface 3 programming guide anywhere?I'm interested in the tantalising little bit of text at the bottom of my Multiface 3 manual (under the "Using 8K RAM" section): "Please send a SAE…

    ... it just the action of writing to the port ... /> [1:39pm] JR Z,L06E6
    [1:39pm] OUT (#3F),A
    [1:39pm] JR #06E8
    ... [1:39pm] L06E6: OUT (#BF),A< ...
    zx81 zx81 April 2013 Hardware
  • Multiface 3 programming guide anywhere?I'm interested in the tantalising little bit of text at the bottom of my Multiface 3 manual (under the "Using 8K RAM" section): "Please send a SAE…

    ...
    [1:39pm] JR Z,L06E6
    [1:39pm] OUT (#3F),A
    of obvious, others I hadn't figured out. My aim ... idea, and to work out which bits of the RAM I could ... button to implement a kind of debugger/monitor, similar to pressing ...
    u6c87 u6c87 April 2013 Hardware
  • 128k Basic used much ?Hi - I was wondering if there were many,if any, games programmed in 128k basic? I was also thinking of doing one myself as I wish to make a text heav…

    ... any kind of program you could use to find out which ... would use the proper way of accessing the ram disk.[/ ... , based on a bit of code written by Geoff Wearmouth ... 01) ;determine Spectrum model
    jr z,COPYMA ;48k
    ld a ...
    Battle Bunny Battle Bunny May 2013 Sinclair Basic
  • Buzzer sounds tips'n'tricksSo I have an ARM Cortex M3 with a buzzer connected to its GPIO pin. And because I read this forum I know that there is no need to add a separate buzz…

    ... /> or a
    ret z ;if end of data reached, exit player ... beeper output mask on
    jr skip1a

    skip1 ... ...

    skip2a
    out ($fe),a ;switch beeper on ...
    utz utz May 2013 Development
  • ZX-Assembler in progress...Dear readers, I just want to announce that ZX-Assembler is not longer only an idea in my mind. It's just alive. Unfortunately, it's too early to mak…

    ... command to reinterpret a certain range of addresses according to the ... re-interpreted as CALL or JR/DJNZ/JP . For undefined ... accept these lines even if out of order, although it should automatically ... begin. It has a great range of capabilities.

    I ...
    clausjahn clausjahn May 2013 Emulators
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... on Fuse and SpecEmu... :-) (Of course, in this case, ... code]
    xor a
    out (0FEh), a
    ld sp ... /> bit 2,a
    jr z,X0121
    ei
    ... code]

    My understanding of all this is that on ...
    John Elliott John Elliott July 2013 Emulators
  • Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…

    ... [code]
    xor a
    out (0FEh), a
    ld sp ... /> bit 2,a
    jr z,X0121
    ei
    ... [/code]

    My understanding of all this is that on ... IFF1, and bit 0 of the interrupt flag byte ...
    Korinel Korinel July 2013 Emulators
  • generating a pre-defined list in an un-defined sequenceI've decided to become a drunkard, to which end I've been drinking a whole bottle of beer in one day (whereas normally I'd make it last 2 or 3 days).…

    ... h
    rr l
    jr nc, done_lfsr

    ld ... />
    dec hl ; alter lfsr range to include 0

    Alcoholics Anonymous Alcoholics Anonymous July 2013 Sinclair Basic
  • generating a pre-defined list in an un-defined sequenceI've decided to become a drunkard, to which end I've been drinking a whole bottle of beer in one day (whereas normally I'd make it last 2 or 3 days).…

    ... />
    add hl,hl
    jr nc, done_lfsr

    ld ... />
    dec hl ; alter lfsr range to include 0

    Alcoholics Anonymous Alcoholics Anonymous July 2013 Sinclair Basic
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... answer my question of whether custom loaders ... /> jr nc,.exit ; bail out if BREAK pressed
    jr z,.main_loop ... zero clear, and the number of iterations in B
    ... tapes that are 20% out of spec in either direction ...
    stephenw32768 stephenw32768 August 2013 Development
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