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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
  • Bleepload - different either side of the tapeHiya. I'm not sure if this is the right section or whether this should have gone under the tape preservation section. Anyway, I don't go on the foru…

    ... all - and I mean ALL - Bleepload games seem to have entirely ... started noticing that all the Bleepload games had totally different checksums ... others it's all the Bleepload code that varies.

    Bleepload game whereas if it's ...
    richl richl November 2008 Games
  • 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
  • Unprotecting games without knowning m.c.DivIDE or MB02 users don't need unprotected games, but those who still use the Microdrive, Wafadrive, Timex FDD, +3, Plus D, Disciple or use the new …

    ... strip the loading scheme (Speedlock/Bleepload) and give you the raw ... the code: uncompress then automatically JP to the game's start ... heart's content then manually JP. The best feature of CC1 ...
    jp jp June 2008 Sinclair Miscellaneous
  • 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…

    How to quickly hack 48k Bleepload (Magnetron) to get the start ... 'll see the execution address JP 40960.

    Now set ...
    FrankT FrankT January 2013 Games
  • Tape loading - blocks with checksumThese were sometimes used for 128K games and had a searching / loading message, ie. Loading Block 08, then if a block didn't load right one could rew…

    [QUOTE=jp;709634]It's not as forgiving as Bleepload - pause then rewind the tape for some reset fun... ;)[/QUOTE]

    Was about to say the same. 131 byte blocks; presumably 128 bytes of data, 2 bytes for block id and 1 byte checksum.
    BloodBaz BloodBaz July 2013 Development
  • Tape Loaders and Tape MasteringHi guys, A couple of questions. As I'm getting towards the later stages of developing a game that's eventually going to get a physical release, I …

    [quote="jp;889210"]I've been having ... /KennyDalglishSoccerManager(MasterTape)(ZeppelinGamesLtd).tzx.zip"]Bleepload master tape[/url] for [url ...
    leespoons leespoons January 2017 Development
  • Flying Shark - Maximum firepower PokeI'm playing Flying Shark again and it's difficult! The tip shop has pokes for immunity, extra lives etc. but these make it too easy. So does anyon…

    ...
    ld ($ec0e), hl
    jp $9e3a
    [/quote]

    Bleepload loads small data blocks at ...
    Ast_A_Moore Ast_A_Moore October 2018 Games
  • 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…

    ... /> .......LD DE,0
    .......JP MAIN

    B2.....INC ... ; fetch highbyte (7)
    .......JP (HL) ; jump indirect to emulationroutine ... 00
    JP I03
    JP I06
    ...
    JP IFF ; last ... #83 (#8301)
    ...
    JP IFD ; last (#8300-#83FF)
    Dr BEEP Dr BEEP October 2001 Sinclair Miscellaneous
  • Games UNDERated by magazinesYep, a slight twist on the previous topic. Which were the games you thought were underrated by mags, but were really much better in your opinion. …

    ... reviewer would have thought that JP would be still so popular ...
    Arjun Arjun April 2002 Games
  • Short Z80 QuizQ1) Which program gives different result ? A) XOR A ADD A,A B) XOR A ADC A,A C) SCF ADD A,A D) SCF ADC A,A Q2) What is the equivalent of NEG …

    ... L
    DEC B
    JP NZ,LOOP
    RET
    Dr BEEP Dr BEEP July 2002 Games
  • [NEW]: Spectaculator 4.0Hi everyone, Finally managed to finish it... enjoy! --- [NEW]: Spectaculator 4.0 Spectaculator is a Sinclair ZX Spectrum emulator for PCs runnin…

    ... . Supported loaders include
    Alkatraz, Bleepload, Hewson, Haxpoc-Lock, Mikrogen, Movieload ...
    Jon Needle Jon Needle January 2003 Emulators
  • Loading schemes18 years ago I hated loading schemes like Alcatraz and Speedlock because they were a b*tch to copy and became unreliable when the tape got older. Now…

    ... issue anymore.
    But Firebird Bleepload has become my least favorite ...
    Paul van der Laan Paul van der Laan July 2003 Games
  • Z80 Emulator Source?Found a link to this on comp.sys.amstrad.8bit. i havent been with the discussion long but supposedly this is the source for a Z80 emulator. Forgive m…

    ... hl,hl ;hl=84xxh
    jp (hl)
    fetchend:
    .ds ...
    Amigo Amigo August 2003 Emulators
  • Help required re. a sourced MIA gameHi, This morning I sourced an MIA game called Rescue From Atlantis by Summit. I've sampled the tape and it uses a weird bleepload type loader called…

    ... and it uses a weird bleepload type loader called Poliload.
    Gilby Gilby September 2003 MIA/STP/SDP
  • Not just a pretty [inter] face!Hi everybody, I've got a DK'Tronics Light Pen up for grabs (see [url="http://www.worldofspectrum.org/infoseek.cgi?regexp=^DK%27Tronics+Light+Pen$&mo…

    ... /> [ This Message was edited by: jp on 2004-03-09 21 ...
    jp jp March 2004 Sales
  • TASM, Z80 and Spec emusHi! Having some novice questions here regarding TASM and writing machine code for the Speccy emus... Now I have configured TASM into my EditPlus and…

    ... .e for using absolute calls - JP, CALL etc - instead of relative ...
    ekoman ekoman July 2004 Development
  • IM 2 interrupts and smooth scrolling - easy peasy!Okay, been fiddling around with IM 2 and have actually mastered (I think) how to use IM 2! Now I run my game Ragnar Revival in IM2 and use HALT to sy…

    ... to 0056 in ROM
    jp 56 ;for smooth return to ... /> ld hl,58853 ;Create a JP NN at address
    ld ...
    ekoman ekoman July 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... where you could put a JP to your 'real' interrupt routine ...
    Philip Kendall Philip Kendall July 2004 Development
  • Game loop design?Having some thoughts on how to design the game loop and could do with some hints and tips from folks who have done it before! It's all about how to …

    ... gets into IM1 and calls JP 56
    jr loop
    ekoman ekoman July 2004 Development
  • Mysterious bit of codeHi everyone, I found the follow piece of code in a game and was wondering what it does. ld bc,40ffh ld e,40h loop ld a,r …

    ... ,(c)
    cp e
    jp nz,loop
    ret
    dmsmith dmsmith August 2004 Sinclair Miscellaneous
  • need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …

    ... ,(SPRXCO) ;
    AND 7 ;
    JP Z,DRAWNOX ;this part doesnt ... line on the screen.
    JP DRAWSPY
    DRAWCH1
    INC ...
    moroz1999 moroz1999 August 2004 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... to 0056 in ROM
    jp 56 ;for smooth return to ...

    ORG 0FDFDH
    JP MainLoop

    END
    robpearmain robpearmain August 2004 Development
  • 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
    CP 0
    JP Z,INTEND



    ORG 0FDFDH
    JP MAINLOOP


    END ...
    robpearmain robpearmain September 2004 Development
  • 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 …

    ... A


    JP MAIN

    RET
    CP 0
    JP Z,INTEND

    ... +1),A

    JP NZ,gob

    ... />
    ORG 0FDFDH
    JP MAINLOOP


    ...
    robpearmain robpearmain September 2004 Development
  • flying sharkHi, I'm looking for a tap or disked version of Taito's Flying shark, the original loader is a protected bleepload and I'm not very good in asm hackin…

    ... original loader is a protected bleepload and I'm not very ...
    Mp Mp September 2004 Games
  • Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…

    ... A ;increase scroll position
    JP NZ, MLOOP
    RET< ... ;decrease loop counter
    JP NZ, MODHLB ;and jump back ... />
    DJNZ CLEARLP2

    JP ZERO ;Skip the next bit ... ;decrease row loop counter
    JP NZ, ROWLOOP ;jump back to ...
    dmsmith dmsmith September 2004 Development
  • The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…

    ... at end of table
    jp z,#1ff8 ; Do last carriagereturn ...
    Dr BEEP Dr BEEP September 2004 Development
  • Highly OT:unless the topic is pc arcade games :p did you know you can play classic arcade games in microsoft excel???? i didnt i do now :) [url="http://www.…

    ... />
    [url="http://www.geocities.jp/nchikada/pac/"]http://www.geocities ... .jp/nchikada/pac/[/url]

    ...
    mel the bell mel the bell January 2005 Sinclair Miscellaneous
<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…
  • happy birthday jpyup<br /> <br /> happy birthday
  • Bleepload - different either side of the tapeHiya. I'm not sure if this is the right section or whether this should have gone under the tape preservation section.<br /> <br /> Anyway, I don't go…
  • Happy Burfday jp!Happy Burfday!<br /> <br /> Drink Beer (your avatar implies you may already be ;))<br /> <br /> Have a Gudden!
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  • Happy Birthday jphope it's a good 'un
  • Happy Birthday JP!Happy Birthday JP!<br /> <br /> (Though taking the time difference into account it may no longer be your birthday)<br /> <br /> Happy hacking all the…
  • JP (HL) confusionokay.... JP nn will jump to memory address nn.<br /> JP (HL) ,I assumed would read the contents of memory address HL and jump to the location<br /> …
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