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<1234567…34>
  • DEC BC/LD A,B/OR C/JP NZ,loopyesterday i saw nice trick:[code] dec bc ld a, b or c jp nz, loop can be replaced (bc starts >255, short jump) by: dec bc inc b djnz loop [/code] …

    yesterday i saw nice trick:[code]

    dec bc
    ld a, b
    or c
    jp nz, loop

    can be replaced (bc starts >255, short jump) by:

    dec bc
    inc b
    djnz loop
    [/code]
    ..nice
    Fikee Fikee February 2005 Development
  • Happy Burfday Gasman!!!Happy Burfday Gasman! May you have many more gassy Guddens :D Happy Burfday! Drink Beer! Have a Gudden!

    Happy Burfday Gasman!

    May you have many more gassy Guddens :D

    Happy Burfday!

    Drink Beer!

    Have a Gudden!
    dm_boozefreek dm_boozefreek July 2007 Chit chat
  • 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 …

    ... came up with from [B]gasman[/B]'s suggestions. It' ... ;04t => 022t
    jp nz,interrupt_delay_loop ;10t => 032t ... still works in BASIC):
    jp 56

    ; ... interrupt routine:
    sample_jump
    jp interrupt_main


    ...
    joefish joefish May 2009 Development
  • Happy Birthday GasmanHappy birthday Gasman...

    Happy birthday Gasman...
    rich_chandler rich_chandler July 2009 Chit chat
  • Minor Update to Gasman's Midi2BEEPDon't know whether this is worthy an announcement, but for those of you who enjoyed Gasman's midi2BEEP utility, a new variant has been made called mi…

    ... those of you who enjoyed Gasman's midi2BEEP utility, a new ... is kindly being hosted on Gasman's webpage at:

    Gasman a copy... ;)
    kgmcneil kgmcneil May 2010 Announcements
  • Happy Birthday GasmanHappy birthday Gasman.. have a nice one

    Happy birthday Gasman..

    have a nice one
    fog fog July 2010 Chit chat
  • John Garner, Icabod, Gasman, etc. :)Trip down memory lane... I wonder if everything this site had has found its way to the archive... According to Andy at the ZX81 forums, it's the only…

    ... .demon.co.uk/spec/groups/gasman.html[/url]
    [url]http ... just happy we still have Gasman!
    zxbruno zxbruno September 2011 Sinclair Miscellaneous
  • 28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…

    ... think only Joefish read it! Gasman independently came up with essentially ... />
    LABEL ORG 0FDFDH
    JP HIRES
    ORG LABEL
    AMW AMW April 2012 Development
  • Pimp my Sinclair C5[img]http://i.dailymail.co.uk/i/pix/2012/04/03/article-2124408-1272681B000005DC-788_306x280.jpg[/img] In a daily newspaper [url]http://www.dailymai…

    ... .co.uk/news/article-2124408/Pimp-Sinclair-C5-Plumber-turns-electric ...
    Geoff Geoff April 2012 Sinclair Miscellaneous
  • Interview with Gasman / Chris Smith at RetroEuskal...in Gameback episode 2, which is a 1.5 hr programme about RetroEuskal! It's in Spanish, but you may be able to hear what Chris and Gasman have to …

    ... to hear what Chris and Gasman have to say under the ... trouble hearing it)

    Gasman is at about 14 minutes ...
    Winston Winston October 2012 Sinclair Miscellaneous
  • Happy Birthday JP!Happy Birthday JP! (Though taking the time difference into account it may no longer be your birthday) Happy hacking all the same :smile:

    Happy Birthday JP!

    (Though taking the time difference into account it may no longer be your birthday)

    Happy hacking all the same :smile:
    R-Tape R-Tape April 2013 Chit chat
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... to memory address nn.
    JP (HL) ,I assumed would ... using a list of CP...JP nn

    or ... br /> LD HL,jumptable
    JP (HL) ; read/peek the contents ... what instructions do.
    JP nn means PC=nn
    JP (HL) means PC=nn
    JP (IX) means ...
    MatGubbins MatGubbins March 2014 Development
  • Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…

    ... 2004-04-24 21:43, gasman wrote:
    Sound quality isn ... and rets for volume with "jp"s to save another 7 ...
    Alcoholics Anonymous Alcoholics Anonymous April 2004 Sinclair Miscellaneous
  • Amiga MOD on ZX SpectrumWell, there were several question about music matters on WOS lats times, so I decided to describe some of my 'adventures', heheh, with MOD playing on…

    ... 2004-04-26 15:35, gasman wrote:
    Hang on, minor ... to pass, decremented above
    jp nz, dosamples

    ; now ...
    Alcoholics Anonymous Alcoholics Anonymous April 2004 Sinclair Miscellaneous
  • BASIC performance tips?Been fiddling around with an old project a little after rescuing it from tape, and I'm toying with the idea of completing it (hey, better late than n…

    ... a single JP.

    [ This Message was edited by: gasman on ...
    gasman gasman February 2005 Development
  • Fastest way to write something to screen$Hi, I just got pasmo.exe and start playing with attr scrolling, well, not scrolling, just write different values to a block and see if I can introdu…

    ... with DJNZ (or DEC B / JP NZ if the unrolling makes ... /> [ This Message was edited by: gasman on 2005-04-26 12 ...
    gasman gasman April 2005 Development
  • SpeedloadersWhen was the first time they came out and who invented them. What was the general speccy user's and media reaction to them? Would be nice to have a …

    [QUOTE=gasman;184474]Far be it from ... )?[/QUOTE]

    I second gasman here why not spend 1 ... you couldn't hack the JP or RET at the end ...
    BloodBaz BloodBaz April 2007 Games
  • Jaw Dropping spectrum Demo'sPost your youtube vids of the most Jaw dropping Spectrum demos. I stumbled on this whist looking as GasMans vid. [youtube]0DP7RbkSWEQ[/youtube] On…

    ...

    Anyway, I wrote Pimp My Spectrum and all the ... pretty much second all of Gasman's recommendations as well as ...
    evilpaul evilpaul May 2008 Sinclair Miscellaneous
  • Jaw Dropping spectrum Demo'sPost your youtube vids of the most Jaw dropping Spectrum demos. I stumbled on this whist looking as GasMans vid. [youtube]0DP7RbkSWEQ[/youtube] On…

    ...

    Anyway, I wrote Pimp My Spectrum and all the ... pretty much second all of Gasman's recommendations as well as ...
    Scottie_uk Scottie_uk May 2008 Sinclair Miscellaneous
  • Jaw Dropping spectrum Demo'sPost your youtube vids of the most Jaw dropping Spectrum demos. I stumbled on this whist looking as GasMans vid. [youtube]0DP7RbkSWEQ[/youtube] On…

    [QUOTE=gasman;265796]While I've got the opportunity to pimp my own ...
    Arda Arda May 2008 Sinclair Miscellaneous
  • Spectrum more loved than C64It just occurred to me that the Spectrum must be more loved than the C64 these days. After all, it has been more than a year since an update was made…

    ... 2
    gasman 2
    thehive 1
    jp 1
    Vampyre ...
    NickH NickH May 2008 Chit chat
  • Screen access in assemblerI am again troubled by the unusal screen design of the Spectrum. :) If I want to do something with, say, a 16x16 bit block of the screen (in the sam…

    ... the classic one (posted by gasman) by a little bit when ... it becomes even faster using jp instead of jr.
    Metalbrain Metalbrain November 2008 Development
  • Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…

    [QUOTE=gasman;325371]
    (LCD: I'm pretty sure that "JP START" is ... should be no problem) or JP YOUR_PRG to eliminate this misunderstanding.
    LCD LCD December 2008 Sinclair Miscellaneous
  • Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…

    [QUOTE=gasman;325371]If Shadow Maker's ... : I'm pretty sure that "JP START" is supposed to mean ...
    Shadow Maker Shadow Maker January 2009 Sinclair Miscellaneous
  • Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…

    you can save a 2T replacing JR NZ, ... by JP NZ, ... but it will not save you...

    accord my computing you are at 16T/byte now

    somewhere in this forum gasman's multicolor routine is buried. multicolor
    Fikee Fikee May 2009 Development
  • Has any programmers recently pushed the spectrum to the limits?Hi there. Ive just discovered this great forum and I was brought up with the speccy 16,48 and then 128k. Im just wanting to know if there are any re…

    ... POPing and PUSHing data (? la gasman) was 16 unique characters

    LABEL ORG 0FDFDH
    JP HIRES
    ORG LABEL
    AMW AMW August 2009 Development
  • The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…

    ... =ftp://ftp.untergrund.net/users/gasman/zx/goldfinch/gasware-installer-20090925 ... =true if BC=0
    jp pe,calc_checksum[/code]
    Kudos ...
    gasman gasman September 2009 Development
  • AY programming and notes frequencyHello everybody, I'm Targhan from the french CPC group Arkos, perhaps you've heard of us. I'm currently working on a music tool and I'd like to k…

    ... the original routine, derived from Gasman's version, chopping the ... ld (AYREGS+AR_AmplB),hl
    jp rout_a0
    pt3_init:
    ld ...
    jr nz,pt3_initv2
    jp rout_a0

    ; pattern ... )
    push hl
    jp z,ch_exit
    ld (csp_ ...
    chev chev November 2009 Development
  • AY programming and notes frequencyHello everybody, I'm Targhan from the french CPC group Arkos, perhaps you've heard of us. I'm currently working on a music tool and I'd like to k…

    ... at.kz)
    ; Formatted by Gasman for Pasmo and optimized by ... /> ld (AYREGS+AR_AmplB),hl
    jp rout_a0

    p3x_init:
    jr nz,p3x_initv2
    jp rout_a0

    ; pattern ... )
    push hl
    jp z,ch_exit
    ld (csp_ ...
    chev chev November 2009 Development
  • Minor Update to Gasman's Midi2BEEPDon't know whether this is worthy an announcement, but for those of you who enjoyed Gasman's midi2BEEP utility, a new variant has been made called mi…

    [QUOTE=gasman;446232]I suppose the most ... ]can be
    [code]
    JP $03F8; entry point for BEEP ...
    ccowley ccowley May 2010 Announcements
<1234567…34>

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Related Threads

  • DEC BC/LD A,B/OR C/JP NZ,loopyesterday i saw nice trick:[code]<br /> <br /> dec bc<br /> ld a, b<br /> or c<br /> jp nz, loop<br /> <br /> can be replaced (bc starts &gt;255, sho…
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