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<1…19202122232425…34>
  • 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…

    ... user to open any file (even tapes) and edit a ... the same SNA later. Even better if you can establish ... as CALL or JR/DJNZ/JP . For undefined addresses, ZX ... Assembler should accept these lines even if out of order, ... now used string grid, even if the data has to ...
    clausjahn clausjahn May 2013 Emulators
  • 128k Music TrackerCan someone point me in the right direction with this please. I need a straight forward idiots guide for creating music on the 128. I was looking for…

    ... [/url]
    From that link Gasman pointed me to an interesting ... having is with file size.Even though all i have made ...
    jammajup jammajup May 2013 Development
  • JSSpeccy v2.0 releasedI'm pleased to announce version 2.0 of JSSpeccy! [url=http://jsspeccy.zxdemo.org/]Online version[/url] [url=https://github.com/gasman/jsspeccy2]Sour…

    [QUOTE=gasman;703630][b][url=http://jsspeccy. ... the keyboard click keeps clicking. Even after loading Rainbow Islands, it ... keeps clicking (even thru the AY tune)).
    Stefan Drissen Stefan Drissen June 2013 Emulators
  • Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…

    ... scattered around the program. It even has at least one table ...
    LD C, 7
    JP (HL)[/code]
    where the ...
    Battle Bunny Battle Bunny July 2013 Development
  • Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…

    ... scattered around the program. It even has at least one table ...
    LD C, 7
    JP (HL)[/code]
    where the ...
    Morkin Morkin July 2013 Development
  • Kiss Kill - a Spectrum music video from Candy Says and GasmanYou may remember [url=http://www.worldofspectrum.org/forums/showthread.php?t=43068]the preview[/url] of this from back in March - here's the final re…

    ... song on my laptop?
    Even better: maybe I can play ... />
    Do we have any Gasman-merchandise in our inventory to ...
    bverstee bverstee July 2013 Announcements
  • 20-column multicolour: a half-baked ideaI was writing an email reply to one Mr Jowett about multicolour routines, and in that way that explaining something to someone else makes you think "…

    ... Good luck! :)

    [QUOTE=gasman;712065]I realise that the ... cycles, regardless of what happens. Even if we had lots of ... just to refresh/animate tiles. Even so, there's still ... world projects!

    [QUOTE=gasman;712065](which means writing the ...
    Einar Saukas Einar Saukas July 2013 Development
  • Bomberman and other Hudson Soft games on the SpectrumAs I suspected, the games, or at least, I found a comment which confirms it, were ported from the MSX to the Spectrum. The MSX was very popular in Ja…

    ... .eek.jp%2Fworks_ste.php[/url]

    And we could even write ... />
    [url]http://itagaki.eek.jp/contact.php[/url]
    Ralf Ralf July 2013 Games
  • Bomberman and other Hudson Soft games on the SpectrumAs I suspected, the games, or at least, I found a comment which confirms it, were ported from the MSX to the Spectrum. The MSX was very popular in Ja…

    ... .eek.jp%2Fworks_ste.php[/url]

    And we could even write ... />
    [url]http://itagaki.eek.jp/contact.php[/url][/QUOTE]
    Ivanzx Ivanzx July 2013 Games
  • 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…

    ... has LD-VERIFY left in, even though that is not needed ... loader; and it has a JP where a JR would do ...
    stephenw32768 stephenw32768 July 2013 Development
  • 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…

    ... has LD-VERIFY left in, even though that is not needed ... loader; and it has a JP where a JR would do ... . It's also possible the JP is timing related, having a ...
    chev chev July 2013 Development
  • How to write self-relocating code using Pasmo?With z80asm, I can write code like this: [CODE] org 0 ; a total lie, but makes the reloc sums work .dest: equ …

    ... you want to relocate.. as gasman said he includes the bin ... onward..

    you can even use the screen memory and ...
    fog fog August 2013 Development
  • 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…

    ... it's optimal code, or even good code by any standards ... set, BREAK was pressed
    jp z,0x1b7b ; ROM routine indicating ...
    stephenw32768 stephenw32768 August 2013 Development
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    ... emulator. If the jr or jp instructions' condition is false, is ... +1 (and pc+2 for JP) regardless of whether the jump ... /> Sure, but if speed is even slightly important to you, getting ...
    gasman gasman August 2013 Development
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    [QUOTE=gasman;718097]Sure, but if speed is even slightly important to you ...
    u6c87 u6c87 August 2013 Development
  • 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…

    ... is the flag register
    jp po/pe,lp ; 10T Yup ... lot of frustration during development!) Even so, you can still use ...
    stephenw32768 stephenw32768 August 2013 Development
  • 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…

    [QUOTE=jamorski;718437]Even Smaller[/QUOTE]

    But ... br /> bit 4,e
    jp nz,lp1
    ld a ... br /> ld l,a
    jp nc,lp2
    dec h ...
    bit 6,h
    jp nz,lp3
    ret
    Einar Saukas Einar Saukas August 2013 Development
  • New game: Gem Chaser 2Gem Chaser 2 can now be downloaded from my website: [URL="http://www.bobs-stuff.co.uk"]http://www.bobs-stuff.co.uk[/URL] 70 more devious levels, wi…

    ... surprise at first, but as gasman said, it just takes a ... />
    ..I think I'm even worse at this one than ... the first game, is it even possible to get the 'fast ...
    Morkin Morkin August 2013 Brand new software
  • 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…

    ... br /> .read_edge_test:
    jp m,.read_edge_loop ; loop if no ... and self-modifying conditional JP are overhead that ... loader behaves perfectly well even without that improvement, but ... /> In my emulated environment, even a marginal 8000Hz WAV loads ...
    stephenw32768 stephenw32768 August 2013 Development
  • 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…

    ... ).

    It would run even faster using unrolled loop, for ...
    ld l,a
    jp nc,lp2
    dec h ...
    bit 6,h
    jp nz,lp3
    ret[/CODE ...
    Einar Saukas Einar Saukas September 2013 Development
  • Compiler conventions for passing args/return valuesI've been mulling over this for a while, but I can't spot it covered anywhere. There are various methods for passing args and return values between …

    ... stack frame code is even heavier than z88dk's ...
    or e
    jp z, stdio_error_zc

    jp nc, stdio_error_einval_zc ; no
    ... /> inc de

    jp c, write_lp

    ; ...
    Alcoholics Anonymous Alcoholics Anonymous September 2013 Development
  • 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…

    ... start the game executing "[B]jp 24000[/B]" directly.


    Even so, if you really want ...
    Einar Saukas Einar Saukas September 2013 Development
  • Bug in Super Wonder Boy in Monsterland?Hello!:smile: This game seems to have a bug that prevents finalize. The dragon that is in the last level, it is impossible to kill.Remains static.No…

    ... ever shooting a fireball and even then, only when facing left ... />
    [code]org $bd44
    jp fireballs[/code]

    The ... /> org $984d
    jp cleartable[/code]

    jp is working on ...
    Bandit Bandit October 2013 Games
  • Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…

    ... /> loop_high:
    DEC C
    JP P,loop
    RET
    even simpler solution:

    [CODE ...
    Einar Saukas Einar Saukas October 2013 Development
  • Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…

    [QUOTE=gasman;729317]
    [code]
    ld ... (hl), 62
    cpi
    jp pe, loop
    ret
    cpi
    jp pe, loop
    ret
    David Jones David Jones October 2013 Development
  • Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…

    [QUOTE=gasman;729317]oooooOOOOOOooooh
    He posted ... /LD A,B/OR C/JP NZ in the first twenty ...
    catmeows catmeows October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... check upper range
    jp nc, report_b ; error if ... a ; lower range
    jp m, report_b ; error if out ... ; Timex data port
    jp sound_3 ; remainder moved to maintain ... 63 ; timing constant
    jp nz, be_h_and_l_lp ; 10 t-state ...
    chev chev October 2013 Development
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