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Search Again :: Adv Search 1000 results in 0.077s
<1234567…34>
  • where is border/ink, etc stored in rom?hi, i just wondered where these were stored in rom and how i change these?

    hi, i just wondered where these were stored in rom and how i change these?
    digital digital January 2017 Sinclair Miscellaneous
  • How do I get a random numberHi, I need a simple routine to get a random number from 1 to 4. I don't need nothing very complex or that much random, it just have to produce diffe…

    ... />
    I looked into S-RND (in ROM at addr #25F8) but I ...
    AE.Vasconcelos AE.Vasconcelos May 2005 Development
  • Speccy character set address in ROM?Hi guys Can anyone tell me where the speccy character set lives in speccy rom, say, starting from the ! (ASCII 33) character? I'm actually writing …

    ... the speccy character set lives in speccy rom, say, starting from the ...
    Mark Wills Mark Wills August 2006 Development
  • Help needed... RND in machine codeI have been battling away trying to convert a simple BASIC routine (below) to machine code, but to no avail. The routine is used to fire 2 bullets a…

    ... flummoxed, mainly due to the RND equation!

    Any ideas ... [/IMG]

    Many thanks in advance...
    daveysludge daveysludge July 2012 Development
  • random number generator without using rnd in basicwhat is the simplest way to generate random numbers in basic (0-255), without using the rnd statement? i also want it to always generate the same…

    what is the simplest way to generate random numbers in basic (0-255), without using the rnd statement?

    i also want it to always generate the same numbers over and over again.
    digital digital June 2019 Development
  • TZX in ROM...Is it possible to modify BASIC ROM to load TZX images from external memories like Flash EPROM? [ This Message was edited by: klingler on 2004-07-0…

    Is it possible to modify BASIC ROM to load TZX images from external memories like Flash EPROM?



    [ This Message was edited by: klingler on 2004-07-08 15:19 ]
    klingler klingler July 2004 Sinclair Miscellaneous
  • Programming MC : first stepsIsn't nice to collect all kinds of short routines to help making the first steps into MC for everyone who never touched MC? What I mean is mostly th…

    ... call random ; fetch RND number
    add a ... ld hl,(seed) ; fetch RND pointer
    inc hl ... in ROM
    ld (seed),hl ; store next RND ... ret ; A holds RND value
    seed ...
    Dr BEEP Dr BEEP August 2005 Development
  • ROM paging questionAssuming the Spectrum 128 memory map and port addresses, but two custom ROMs in place of the normal Editor and BASIC, what is the most efficient way …

    ... addresses, but two custom ROMs in place of the normal Editor ... routine in ROM-1 from ROM-0 so that when the routine in ROM-1 ... sake of convenience assume routines in ROM-0 will use a RST ... the address of the routine in ROM-1, which means the paging ...
    chev chev January 2006 Development
  • Possibly a little OT: Exporting ROM function addresses to the Z88DKOK, so I'm using the Z88DK. It's entirely possible that some documentation has bypassed me. But assume I have a function in ROM, say, at address 0xF0…

    ... assume I have a function in ROM, say, at address 0xF00, ... as making a declaration in one of the C ... , so the symbol appears in an object file somewhere? ... but this is desperately inefficient in both CPU cycles, memory, ... method to export the ROM's symbol table into ...
    Winston Winston April 2007 Development
  • splib2 from ROMI'm trying to generate IF2 ROM games for ZX Spectrum 16K using z88dk + splib2. So far I've managed to create a new crt0 file and to generate valid RO…

    ... to generate IF2 ROM games for ZX Spectrum ... , placing global variables in RAM and stuff like ... using just these functions in the lib: sp_Initialize, sp_Border ... to the structures generated in RAM from $7000 ... .e. graphics, masks...) in ROM or is it written to ...
    na_th_an na_th_an December 2007 Development
  • Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…

    ... 32768) and memorable address in RAM
    ;initialise score ... ;label for the loop in the game that will execute ...
    Choose a location in ROM where the are 256 random ... ;source of random bytes in ROM
    ld d,0 ... ;source of random bytes in ROM
    ld d,0 ...
    bigjon bigjon November 2009 Development
  • Is it possible to access the +3 disk drive via m/c in USR0 mode?Is it possible to access the disk drive of the +3 via m/c +3DOS calls when running in USR0 mode? I ask because I'm having an awful lot of trouble ge…

    ... crashes horribly in the DOS_OPEN call in USR0 mode ... to be at 0x217f in rom 2, it always switches ... out rom 2 for rom 0 at the ... modified from post 39 in [URL="http://www.worldofspectrum ... />
    ; rest of code in here

    ; close ...
    cmonkey cmonkey October 2011 Development
  • The short blocks loaded in Jet Pac(Hope this have not been previously discussed. If so, my apologies) Is there any reason why Jet Pac loads three short blocks after the main block? I…

    ... when assembling the NMI code in ROM and in fact, they patched it ... a single M/C instruction. In fact, the value poked here ...
    mcleod_ideafix mcleod_ideafix November 2011 Games
  • Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code: [CODE] ;; ram-check L11DA: LD H,D ; Transfer the top value to the HL register LD L,E …

    ... CP H ; Have we reached ROM - $3F ?
    JR NZ ... CP H ; Have we reached ROM - $3F ?
    JP ... : CP H ; Have we reached ROM - $0000 ?
    INC HL ...
    antoniovillena antoniovillena April 2012 Development
  • 4 rom cartridges games for Sinclair ZX Spectrum[SIZE="5"][COLOR="Red"]"Space Raiders, PSSST, Jet Pack and Backgammon" FOR USE ON THE SINCLAIR ZX SPECTRUM (ROM CARTRIDGE)[/COLOR][/SIZE] All those …

    ... THE SINCLAIR ZX SPECTRUM
    (ROM CARTRIDGE)[/COLOR][/SIZE]

    in rom, you will have a chance ...
    Themaster Themaster June 2012 Sales
  • Addresses in Fuse debuggerFrom Fuse man page: [I]Addresses can be specified in one of two forms: either an absolute addresses, specified by an integer in the range 0x0000 t…

    ... /> [I]Addresses can be specified in one of two forms: either ... addresses, specified by an integer in the range 0x0000 to 0xFFFF ... `R' (e.g. offset 0x1234 in ROM 1 is specified as `R1 ...
    TK90XFan TK90XFan October 2013 Emulators
  • RST hooks in OpenSE BASICHi, any possibility of OpenSE BASIC having RST vectors rewired to a small table in RAM containing jumps back to apropriate ROM locations? :grin: It i…

    ... small table in RAM containing jumps back to apropriate ROM locations? :grin ... expose vectors that are located in ROM to user mode applications. (hint ... an alternative...is there any ROM left for a small monitor ...
    tstih tstih May 2014 Development
  • Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…

    ...
    to fill the gaps in ROM /translation: useless/.

    in ROM would look like this.

    QUESTION: disclaimer ... ROM overwrites address FFFD thus ...what ... jp instruction
    somewhere in ROM /after memory check/ and ...
    tstih tstih July 2014 Development
  • I need ASM for random numberI need to generate a random pair of coardinates in asm so that x=random no between 0 and 31, y=random no between 0 and 23. Any ideas on how to code …

    ... /> ld a,(hl) ; fetch rnd
    inc l ; increase pointer ... and #3f ; but keep it in ROM
    ld h,a
    RND-routine with A holding ... LD A,6
    CALL RND

    will produce ...
    Dr BEEP Dr BEEP September 2004 Development
  • New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…

    ... can be read with IN 61438 and IN 63486, respectively.
    * ... message printed out is contained in ROM starting at address 5010 decimal ... message printed is fixed and in ROM, you may end up with ... of more use when using ROM routines in a machine code program ...
    na_th_an na_th_an April 2005 Development
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... emulator with the SE Basic ROM which uses the method of ... devised by Sir Isaac Newton in 1650 (ish). The results are ... and his sister Penny Vickers in the two respective books they ... clarify the method used for RND in the ZX81 (and ZX Spectrum ...
    Geoff Geoff December 2007 Sinclair Basic
  • Help needed... RND in machine codeI have been battling away trying to convert a simple BASIC routine (below) to machine code, but to no avail. The routine is used to fire 2 bullets a…

    ... pointer in ROM.

    When RND is read I adjust the ROM pointer ...
    Dr BEEP Dr BEEP July 2012 Development
  • Non-repetitive RNDHi guys) Perhaps, some of you already encountered a situation, when one needed a set of [b]unique [/b](pseudo-)random values, say, from zero to 25…

    ... ]. However you just cunningly replaced RND function with a FRAME counter ... require a buffer--a DIM in this case.

    The ... ; perhaps, there's one appropriate in ROM?

    Meanwhile, I'm ...
    NRA NRA December 2018 Sinclair Basic
  • Non-repetitive RNDHi guys) Perhaps, some of you already encountered a situation, when one needed a set of [b]unique [/b](pseudo-)random values, say, from zero to 25…

    ... However you just cunningly replaced RND function with a FRAME counter ... ; perhaps, there's one appropriate in ROM?

    Meanwhile, I' ... a different arrayorder the same RND-values will give a ... games. This works well in BASIC as in MC, even with ...
    Dr BEEP Dr BEEP December 2018 Sinclair Basic
  • Yet Another Speccy Quiz (not too hard)OK! I thought I'd chance my arm at one of these things. I must say I've found the recent quizzes WAY too difficult, so I've pitched this one at simpl…

    ... Spectrum game that would fit in with the above connection.
    in ROM cartridge format. (8 correct: 1 ... name to the shape used in said technology. (That's the ...
    Ed Ed August 2002 Games
  • 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…

    ... run my game Ragnar Revival in IM2 and use HALT to ... ,07Fh ;Trap Space key
    in a,(07Eh)
    and 1 ... /> ei ;interrupts. Jump to 0056 in ROM
    jp 56 ;for smooth ...
    ekoman ekoman July 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] ; ***********…

    ... ;Trap Space key
    in a,(07Eh)
    and 1 ... ei ;interrupts. Jump to 0056 in ROM
    jp 56 ;for smooth ... is the only area, in theory left moving sprites are ... thus moving 256 bytes forward in memory to FB0Ah
    ...
    robpearmain robpearmain August 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…

    ... z,#1ff8 ; Do last carriagereturn in ROM
    inc hl ; Goto ... next byte in table
    ld e,(hl ... ) ; Fetch 'last' byte in table
    prbyte ld a ... /> call #22b0 ; Save A in B and calculate screen
    Dr BEEP Dr BEEP September 2004 Development
<1234567…34>

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rnd 2.9K 4.1K
in 401.9K 810.5K
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