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<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…

    ... simple routine to get a random number from 1 to 4 ... very complex or that much random, it just have to produce ... /> 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
  • 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…

    ... scroll road
    ;random road left or right
    in ROM where the are 256 random looking ... bytes and add the low byte of the score in ... hl,14000 ;source of random bytes in ROM
    ld d ... hl,14000 ;source of random bytes in ROM
    ld d ...
    bigjon bigjon November 2009 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…

    ... /> Here is a simple Random number generator for every number ... 1-6
    call random ; fetch RND number

    random push hl ; save registers
    in ROM
    ld (seed),hl ...
    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
  • New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…

    ... worth of program really useful in (re-)learning BASIC, ... space to b
    in a,(c)
    cp ... ld (hl),a
    ;random road left or right
    random bytes in ROM
    ld d,0 ... jp principalloop
    ;return score in BC
    gameover
    ...
    bigjon bigjon December 2008 Development
  • Need help with interrupts againI'm fighting to understand how interrupts code handling works I'm trying to set my simple own interrupt routine, as I don't want to be dependent on …

    ... want to be dependent on ROM routines. The most important thing ... at (I*256+N) (N: random value 0-255)
    ;it ... is byte 0 which is in ROM and has value 243
    Ralf Ralf 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
  • TAP files for the TS 2068Hi, just recently bought a TS 2068 and found "Taper" on the web. Downloaded it and began to use it only to discover that it would not open TS 2068 fi…

    ... with Spectrum software. ROM routines were in different places and the ... Spectrum ROM were in different memory locations (or even in a different ROM in ... the BASIC program to remain in ROM and the entire RAM ... it's data bus gave random data when unused addresses ...
    Sparky Sparky December 2002 Sinclair Miscellaneous
  • 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
  • List of RANDOMIZE USR code effects?Hi chaps, Does anyone have one of these please? Thanks.

    ... .pdf"]The Complete Spectrum ROM Disassembly[/url] - everything ... instruction of the program in ROM, or part of an ... to in the memory map. When jumping to random locations ... of jumping to a random location will be ... be harmed by executing random RANDOMIZE USR x's. ...
    monty.mole monty.mole May 2005 Sinclair Basic
  • Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…

    ... are constantly used / used at random moments so they always have ... code subroutines? The examples in the spectrum rom seem to use the ... symbol thinggy mapping to addresses) in my assembler program? For instance ... requires me to manually page in ROM 3 and RAM 0, and ...
    Alcoholics Anonymous Alcoholics Anonymous January 2007 Development
  • problem using FRAMES to generate 'random' numbersI realise the pros use bytes from ROM to get their random numbers, presumably because they want to use FRAMES to synchronise the printing and avoid s…

    ... pros use bytes from ROM to get their random numbers, presumably because ... to calling a byte from ROM?

    here's a ... the timer and rom place

    [code]
    random ld hl ...
    and #3f ; keep pointer in ROM
    ld h,a
    Dr BEEP Dr BEEP March 2008 Development
  • New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…

    ... caps to v
    in a,(c)
    cp ... keyboard space to b
    in a,(c)
    cp ... /> ld (hl),a
    ;random road left or right
    random bytes in ROM
    ld d,0 ... jp principalloop
    ;return score in BC
    gameover
    pop ...
    bigjon bigjon January 2009 Development
  • Goldfinch - an open software stack for mass storageYep, another pet project of mine to compete with all the others I've started. But hey, if I didn't get distracted by things like this I'd just get di…

    ... new future of internet and random access storage.

    ... />
    [code]
    FILE *in;
    in = fopen("d>/games/rtype ... Suppose we constructed an 8k rom containing a z88dk stdio core ... hw's main disk device in rom. Then any program written to ...
    Alcoholics Anonymous Alcoholics Anonymous June 2009 Announcements
  • When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers

    ... I need to generate a random number for the initial transaction ... br />
    Practically speaking, the random number generator doesn't have ... at zero after the program in ROM clears it down). The chunk ... R, A will also give random enough results too, different ...
    Winston Winston November 2009 Development
  • When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers

    ... I need to generate a random number for the initial transaction ... ?

    BTW my random number generator:
    [code]
    in ROM
    ld h,a
    ld a,(hl) ; random ROM address ... br /> ld (23672),hl ; store random number
    ret
    [/ ...
    Dr BEEP Dr BEEP November 2009 Development
  • My first platformerHi all! How do you do? Been lurking here for a while, but never had the courage to join the forum. :) The Speccy was my first computer, so I've alw…

    ... draw function to all chars in a given column. (Think ... sp1_IterateSprChar and sp1_ChangeSprType). Keep in mind that every new sprite ... use the Sinclair character set in ROM -- if not there the ... as the software rotater reads random shift data from the ...
    Alcoholics Anonymous Alcoholics Anonymous March 2010 Development
  • OpenSE Software CompatibilityWith the earlier Open82 project a page was set up on Wikia ([url]http://scratchpad.wikia.com/wiki/Open82[/url]) with compatibility information on var…

    ... an alternate initialization sequence in ROM-0 that would set ... UDGs in the standard place and then switch to ROM- ... persuaded to write the stub ROM, and it would avoid ... it existed I think. In terms of demand, I ... download a few TZXs at random, those are the people ...
    Fred Fred June 2011 Sinclair Basic
<1234567…34>

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