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<1…9101112131415…34>
  • 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…

    ... jgh
    ;
    ld a,$ff ;
    ld (err_nr),a ; force ... code to call any shadow rom address
    ;
    ; oops, if1 ...
    jp jp June 2010 Development
  • SZX Beta 128 (aka TRDOS) block questionHello, I have a question or two regarding the Beta 128 (aka TRDOS) block of SZX. Hopefully someone (Jon, Philip) will help me. What is supposed to …

    ... ...

    Fortunately TR-DOS ROM sets the system register before ... the value back from port #FF, as that is not the ...
    Patrik Rak Patrik Rak August 2010 Emulators
  • SZX Beta 128 (aka TRDOS) block questionHello, I have a question or two regarding the Beta 128 (aka TRDOS) block of SZX. Hopefully someone (Jon, Philip) will help me. What is supposed to …

    ... Rak;467142]Fortunately TR-DOS ROM sets the system register before ... the value back from port #FF, as that is not the ...
    Fred Fred August 2010 Emulators
  • ccompletly baffeled machine codeHi everyone, BEFORE you ask i have not asked help for loads of problems i have recently now encountered and i figured the problems out myself, hones…

    ... do:

    LD (HL),FF
    RET

    this ... prints stuff in the rom. But i want to print ...
    Robin Robin September 2010 Sinclair Miscellaneous
  • SAM programmingHi Can anyone provide any example hello world or graphics/sprite printing style machine code routines for the SAM? I can't seem to find anything rem…

    ... />
    ld a,&ff ; sample data
    ld (& ...
    or rom0_off ; disable ROM 0
    out (lmpr),a ... />
    ld a,&ff ; sample data
    ld (& ...
    obo obo September 2010 Development
  • 128kefrom the scratchpad for the 128ke "Finally, reading from a non-existing port (eg 0xff) will give the screen/attribute bytes as it does on the 48K/12…

    ... mode, or with the 128ke rom set sort that out?
    rom and locks all the paging ... to run.

    what rom are you using, and what ... /> yes I think the IN FF fix will solve your sabre ...
    guesser guesser September 2010 Hardware
  • 128kefrom the scratchpad for the 128ke "Finally, reading from a non-existing port (eg 0xff) will give the screen/attribute bytes as it does on the 48K/12…

    ... and use Andrew's SpecSE rom (supplied with Eighty One) neither ... +3 and use the SpecSE rom

    cobra on the ... to see if the IN #FF mod is worth doing so ...
    BiNMaN BiNMaN September 2010 Hardware
  • Override AUTOLINE start?Hi there, Is there a poke that prevents a BASIC program from auto running, when it was previously saved with the LINE command? Cheers, Steve

    ... the BASIC variables area
    ; ROM calls
    LD_BYTES equ $0556 ... to load
    ld a, $ff ; Indicate loading data block (A ... = $FF)
    scf ; Signal loading
    ... return to BASIC
    defb $ff ; 0 - OK
    ; Header data ...
    stefrobb stefrobb November 2010 Sinclair Basic
  • Oscilloscope Speccy ProgramHi all, I remember very well in the old days when my Speccy was my single computer (around 1992) that I have had an oscilloscope software. This uses…

    ... />
    I checked what the ROM does in LD-SAMPLE at ... whether BC starts off with $FF or $AF - it still crashes ... that extra line from the ROM code would fix it, but ...
    Battle Bunny Battle Bunny November 2010 Sinclair Miscellaneous
  • What Spectrum to choose?Hi i'm new to the Spectrum. I read 'bout it in CDA (Polish game magazine) and watched LGR review of the 48k and it REALLY interested me. What model m…

    ... of $FF bytes in the spare section of ROM.
    ... had two bytes containing $FF, $FF where pages joined (4 ... Nobody was using pages of $FF.
    It was only ...
    Luckily the GW03 ROM fixes all four locations and ... ripped off the GW03 ROM tend to be clueless ...
    Geoff Geoff November 2010 Hardware
  • +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 …

    ... /> ld sp, $62ff ; 5b26 31 ff 62 $0ats
    jp $6300 ... /> ; Bit 4 : 0=ROM 0 (128K Editor), 1=ROM 1 (48K BASIC ... 0).
    ;
    ; The Editor ROM (ROM 0) always places a copy ...
    jp jp January 2011 Games
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... 1156
    DD CB (00-FF) ROM : A4B8 failed, expected D9EB
    FD CB (00-FF) ROM : A5B8 failed, expected D9EB
    CB (00-FF) 5+3 ROM : 4B39 failed, expected 4D19 ...
    CB (00-FF) 5+3 ...
    gasman gasman February 2011 Hardware
  • SAVEing without waiting for keypresshello, here's question for y'all. is there a way in BASIC to bypass the "Start tape, then press any key" prompt when SAVEing an array? sorry if it'…

    ... while still using the standard ROM routines, is to write a ... at $04C2 directly; setting A=$FF for a data block, DE ...
    Battle Bunny Battle Bunny March 2011 Sinclair Basic
  • Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …

    ... work incorrect and port FF return value FF as ZX128+2A. Keyboard ... emulating?
    [*]Lack of available ROM dumps (or removal thereof due ... 48K Speccy with a different ROM? I gather there's the ... and CP/M modes in ROM — but the manual is in ...
    zub zub March 2011 Hardware
  • SAVEing without waiting for keypresshello, here's question for y'all. is there a way in BASIC to bypass the "Start tape, then press any key" prompt when SAVEing an array? sorry if it'…

    ... which uses part of the ROM SAVE routine to write a ... 1,000 bytes of the ROM.

    Which data values ... routines in The Complete Spectrum ROM Disassembly should help a lot ... ]
    LD A, $ff ; 32600 62 255 A=$FF indicates data block ...
    Battle Bunny Battle Bunny April 2011 Sinclair Basic
  • So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…

    ... in any case as port #FF that was usually used for ... used in place of the ROM which makes emulating various other ...
    chev chev May 2011 Sinclair Miscellaneous
  • So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…

    ... TS2068 using a ZX Spectrum ROM and I was able to ... have been patched as reading #FF just returns the last value ...
    chev chev May 2011 Sinclair Miscellaneous
  • Question about divide +Hi A friend has sent my a faultly divide + to see if I can repair it. If I use this divide+ with a spectrum 48K (That works perfectly with my stand…

    ... as original DivIDE 32kBram+8kB rom. This way enable installation up ... . DivIDE plus contain also 512kB rom = on DivIDE Plus is 512kB ... used 16kB ram/rom paging instead original ZX rom. RESIDOS need this ... data bus. Always return value #FF for IM2 vector
    3 ...
    velesoft velesoft May 2011 Hardware
  • RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…

    ... power on, all registers contain $FF (or whatever value is the ... HL' is initialized by the ROM to hold some calculator-related ...
    mcleod_ideafix mcleod_ideafix May 2011 Emulators
  • RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…

    ... poke these two addresses with $FF and do the RAND USR ... 's more places in the ROM with similar instructions, including a ...
    mcleod_ideafix mcleod_ideafix May 2011 Emulators
  • RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…

    ... ve got a home-made ROM cartridge with a 128K ... 000 belongs to this new ROM.

    The program ... version of the "Register retriever ROM" (to give it some ... up are not 00, nor FF, but a mixture of ... I've used (source code + ROM file)[/url]

    ...
    mcleod_ideafix mcleod_ideafix May 2011 Emulators
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... the I register, and use $FF for the lsb. (this is ...
    ccowley ccowley June 2011 Emulators
  • Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…

    ... the 'empty' (#FF) locations in the 48k Spectrum's ROM as a ...
    WullyNully WullyNully June 2011 Infoseek database
  • Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…

    ... the 'empty' (#FF) locations in the 48k Spectrum's ROM as a ...
    Einar Saukas Einar Saukas June 2011 Infoseek database
  • Saving and Loading from tape in MC?I'm actually having problems with saving and loading from the ROM routines for the interpreter... I'm currently using the following codes for saving…

    ... = $00 for a header block, $FF for a data block
    If you're using the ROM routines then pressing BREAK/SPACE ... /bytes)
    ------ ($01-$0A) = name ($FF = null name)
    ------ ($0B-$0C ...
    Battle Bunny Battle Bunny July 2011 Development
<1…9101112131415…34>

Latest Posts

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