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<1…891011121314…34>
  • 128K Guru requiredThe answer eludeth me, and I seeketh a higher knowledge! I'm in the process of putting together a very simplistic emulation testbench of my laptop s…

    ... br />
    The 48K ROM in a Spectrum 128 is ... routine at $3c04 in ROM 1 that is called by ... padded with $ff's in the "real" 48K ROM, but has ... been used in the 128K machine.

    $ff ... ...

    One swift ROM change later.. all's workin ...
    rich_chandler rich_chandler May 2008 Hardware
  • 48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…

    ... of unused bytes ($FF) at end of ROM (around $3900 if ... br /> 3) The original 48K ROM is different to the 48 ... they jump into the ROM at non-standard locations ... work. See Geoff's ROM disassembly for a better ... this is to use a ROM replacement tool (like " ...
    Jimmy Jimmy June 2008 Games
  • ZX128/+2 unrainer (HAL10H8)[url]http://velesoft.speccy.cz/zx/umbrella/umbrella.htm[/url]

    ... to low 16kB(to ZX rom). You can in NMI menu ... is set and I= #C0-#FF or if I= #40-#7F ... set correct ZX128 page+videoram+rom
    Next NMI version will ...
    velesoft velesoft August 2008 Hardware
  • VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…

    ... characters (512 bytes)
    ; from ROM 32768 to RAM 7168
    BNE TL_1
    LDA #$FF
    JMP STORE_WORMDIR
    TL_1 ...
    CMP #$FF
    BNE TL_2
    LDA ... /> BNE TR_5
    LDA #$FF
    JMP STORE_WORMDIR
    TR_5 ...
    Digital Prawn Digital Prawn August 2008 Sinclair Miscellaneous
  • Bresenhams circle algorithmI post here my final circle code to replace, if you want, the one in the ROM. It only uses integer math and runs very fast and is very compact. It is…

    ... integer coordinates.
    ; Note. original ROM circles are slightly displaced to ... c,a
    ld b,$ff
    inc bc ;bc' is ...
    rtunes rtunes September 2008 Development
  • CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …

    ... A=0, but checking the ROM at $11FD it only cares ... if A=$FF (anything else is not a ...
    Jimmy Jimmy September 2008 Games
  • CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …

    ... A=0, but checking the ROM at $11FD it only cares ... if A=$FF (anything else is not a ...
    jp $11cb ; go to ROM
    [/code]

    9 ...
    Dr BEEP Dr BEEP September 2008 Games
  • CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …

    I thought I could do 13 bytes without overwriting ROM, but I spotted a bug!

    However, if you can live without setting the last
    Jimmy Jimmy September 2008 Games
  • VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…

    ... (512 bytes)
    ; from ROM 32768 to RAM 7168
    LDA #$FF
    STA WORMDIR

    BNE TL_1
    LDA #$FF
    JMP STORE_WORMDIR
    TL_1 ...
    CMP #$FF
    BNE TL_2
    LDA ...
    Digital Prawn Digital Prawn September 2008 Sinclair Miscellaneous
  • I just learnt that Spectrum has 1kB of unused ROMWell, man learns through all his life. I have just discovered that Spectrum has over 1 kilobyte of unused ROM memory, from address 14446 to 15615. Al…

    You can also use the $FF bytes as an interrupt vector ... byte zero of the standard ROM contains DI ($F3), it effectively ...
    Digital Prawn Digital Prawn October 2008 Development
  • I just learnt that Spectrum has 1kB of unused ROMWell, man learns through all his life. I have just discovered that Spectrum has over 1 kilobyte of unused ROM memory, from address 14446 to 15615. Al…

    ... ]You can also use the $FF bytes as an interrupt vector ... byte zero of the standard ROM contains DI ($F3), it effectively ...
    Dr BEEP Dr BEEP October 2008 Development
  • TIMEX Sinclair 2068 => ZX Spectrum/Timex2048?Hello. I have opportunity to buy Timex Sinclair 2068. According to www sites dedicated to Timex machines, TS 2068 can handle only 7&#37; (!) of Spe…

    ... . You need a totally unmodified ROM for that (any emulator cart ... , no floating bus on port #FF). More than 90% of stuff ...
    >sticking the original ROM in place of the HOME ... ROM. You can then emulate the ...
    Mister Beep Mister Beep March 2009 Hardware
  • Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.

    ... -FF) ROM
    DD CB (00-FF) RAM
    FD CB (00-FF) ROM
    FF) ROM
    CB (00-FF) ROM
    CB (00-FF) RAM
    FF) ROM
    CB (00-FF) ROM
    CB (00-FF) RAM
    FF) ROM
    DD CB (00-FF) RAM
    FD CB (00-FF) ROM
    rich_chandler rich_chandler June 2009 Emulators
  • Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.

    ... /> CB (00-FF) 5+3 ROM
    CB (00-FF) 5+3 RAM ...
    chev chev June 2009 Emulators
  • Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.

    ... -FF) ROM
    DD CB (00-FF) RAM
    FD CB (00-FF) ROM
    FD CB (00-FF) RAM
    CB (00-FF) 5+3 ROM ...
    CB (00-FF) 5+3 RAM ...
    Metalbrain Metalbrain June 2009 Emulators
  • Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.

    ... -FF) ROM
    DD CB (00-FF) RAM
    FD CB (00-FF) ROM
    FD CB (00-FF) RAM
    CB (00-FF) 5+3 ROM ...
    CB (00-FF) 5+3 RAM ...
    rich_chandler rich_chandler June 2009 Emulators
  • Quadrax - Compatibility problems - help!I bought this game last month and when I tried to load it today...it crashes in my +2A!!! Sh*t!! the game was expensive to get, and now I can't play …

    ... machines that area of ROM is filled with $FF. On the +2A ... $3B, as the +2A contains $FF at $3BFF and $3C00.
    FF bytes at key locations in ...
    Jimmy Jimmy July 2009 Games
  • Quadrax - Compatibility problems - help!I bought this game last month and when I tried to load it today...it crashes in my +2A!!! Sh*t!! the game was expensive to get, and now I can't play …

    ... including the $FF bytes at key locations in the ROM.[/QUOTE]
    Ivanzx Ivanzx July 2009 Games
  • +2A/+3 compatibility fixes thread!It might be a good idea to keep these fairly common +2A/+3 compatibility fixes (and requests) in a single thread for quick reference ;) Let's start …

    ... bytes #FF, but on +2A/+3 machines is in 48 rom this ...
    velesoft velesoft August 2009 Games
  • +2A/+3 compatibility fixes thread!It might be a good idea to keep these fairly common +2A/+3 compatibility fixes (and requests) in a single thread for quick reference ;) Let's start …

    ... in +2A mode with all rom versions (4.0, 4.1 ... is used IM2 table with rom data #0-#100. But ZX ... rom contain different values in this ... only 2b value from afress #FF and #100 and CPU jump ... IM2 vector (different value than #FF on data bus) then will ...
    velesoft velesoft September 2009 Games
  • +3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…

    ... begin to fetch instructions from ROM.

    But as no ... ROM is connected, the Z80 will read "FF" (floating bus ... address 38h, which belongs to ROM.

    So the next ... an emulator, simply replacing the ROM file with a file with ...
    mcleod_ideafix mcleod_ideafix September 2009 Hardware
  • which one bit of hardware would people want re-made?I'm just curious in the sense of I see interface 1's go for a fair bit on ebay and also multiface units etc.. so whats the one thing that you don't …

    ... can't read it from #FF because that will get you ... the last thing written to #FF.[/QUOTE]

    Ah, you ... have a spare Timex 2048 ROM. I consider buying a TS2068 ...
    Mister Beep Mister Beep November 2009 Hardware
  • Machine Code Microdrive File LoaderI've been experimenting with transferring games to run from microdrive. Typically I like to see a loading screen while things are happening, and I li…

    ... 's compatible with both [offical] rom issues - now weighing in at ... jgh
    ;
    ld a,$ff ;
    ld (err_nr),a ; force ... code to call any shadow rom address
    ret
    ;
    jp jp December 2009 Development
  • What Z80 development tools do you use? What books?Hi. I've been meaning to do it for over 25 years, but.. better late than never :) I'm starting to learn machine code and am trying to get a developme…

    ... /> I've never used the ROM to do any screen printing ... ]A[/B] from above. Sinclair ROM aficionados will put you right ... fact that B always holds $FF could still be useful in ... . Most of the Jupiter Ace ROM is written like this with ...
    Geoff Geoff January 2010 Development
  • How works the Line-Draw ROM routine ?The 'complete spectrum rom dissasembly.pdf' show info related to the draw rom subroutine. The Line-Draw require two sets of parameters: X,Y coordinat…

    ... or 1 in decimal or FF and 01 in hexadecimal.

    Also note that the ROM routine destroys the value of ...
    GReW GReW June 2010 Sinclair Basic
  • Howto paint a squared zone of the screen ?You know what guys ? i begin to love this languaje. Cant understand why not put more effort on the 80's to learn it :( because it is really speedy. …

    ... do the same with some rom routine that use less code ... /> push hl
    ld a,$ff[/code]
    i tried to ...
    arfgh arfgh June 2010 Sinclair Basic
  • Howto paint a squared zone of the screen ?You know what guys ? i begin to love this languaje. Cant understand why not put more effort on the 80's to learn it :( because it is really speedy. …

    ... and last lines should be #ff, and all other #80,#00 ... /> push hl
    ld a,#ff
    fill0
    ld (hl ... you many times that the ROM routines are really slow. However ...
    Shiru Shiru June 2010 Sinclair Basic
<1…891011121314…34>

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