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<1…10111213141516…34>
  • AY DetectionOff the top of their heads, does anyone know how Exolon detects that an AY chip is present? Reading and writing from the PSG registers seems to work…

    ROM check code at #6D64.
    [code]
    LD A,(#386E)
    SUB #FF
    LD (#6E16),A
    [/code]

    (#386E) = #FF on 48K, #DD on 128K.
    Woody Woody July 2011 Emulators
  • AY DetectionOff the top of their heads, does anyone know how Exolon detects that an AY chip is present? Reading and writing from the PSG registers seems to work…

    ... me that the 1982 48K rom is different to 1986 ... the 80's, looking for FF. Hmmmmm.

    Not ... with interrupts (where the FF area was used as the ... and this Exolon problem, what ROM would be the best to ... happier if it is a rom byte detection issue.
    ...
    csmith csmith July 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…

    ... at 38H and 256*I + FF actually do? I know they ... the first one does) in ROM, but I'm not proficient ...
    PeterP PeterP August 2011 Emulators
  • machine code loadercan someone have a look at this loader and break down what its actually doing and also how i can stop it from executing the 2 loads of headerless blo…

    ... /> It then loads, using the ROM LD-BYTES routine, a SCREEN ... the load, even using a ROM with a working NMI trap ... A,B
    5B16 CP FF
    5B18 JR NZ,5B11 ... ,1B00
    5B21 LD A,FF
    5B23 SCF
    5B24 ... ,A349
    5B30 LD A,FF
    5B32 SCF
    ...
    Geoff Geoff August 2011 Sinclair Miscellaneous
  • 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…

    ... assuming the floating bus supplies $ff all the time during int ... assuming the 48k ROM has a table of $ff bytes to use ... first few bytes in the ROM are whatever they are so ...
    Alcoholics Anonymous Alcoholics Anonymous September 2011 Emulators
  • The SAM CoupeDoes anyone own one of these? I remember being jealous of a friend who bought one of these machines which had a disk that made the system compatible …

    ... - mic/ear) and "attribute" port #FF use same adress as on ... can be install original ZX rom to low 16kB and active ... protect in low 16kB for rom emulation. It enable run ZX16 ...
    velesoft velesoft November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... , as the ULA reads always $FF). Besides, the later is valid ... the CPU and/or the ROM is dead.

    So ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... ;582386]...Then I removed the ROM and found the central display ... />
    If you remove the ROM, and if there's not ... a value, the CPU reads $FF when it's fetching instructions ... . $FF is the opcode for RST $ ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... ;582411]If you remove the ROM, and if there's not ... a value, the CPU reads $FF when it's fetching instructions ... . $FF is the opcode for RST $ ... . At address $38 another &FF will be read instead of ...
    roko roko November 2011 Hardware
  • Create a new microdrive cartridge image formatHi there, I'm working to emulate the IF1+Microdrives in JSpeccy.I've found what the "classic" MDR format ins't capable to store all the required inf…

    ... writes 10 zeros and 2 FF bytes (the preamble), and then ... this depends of the IF1 ROM version. IF1v1 uses a 3 ... back for checking that the ROM does not find errors post ... 180 usable sectors with IF1v2 ROM, I have empirically calculated a ...
    zx81 zx81 December 2011 Emulators
  • PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…

    ... ]Tried calling the Sinclair User ROM routine... Totally baffled now!
    LD D,#ff ; move dy negative
    LD ...
    Dr BEEP Dr BEEP January 2012 Development
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... use reading from port 255(#FF) = "attribute port". Is runable only ... games that need original ZX48 rom can work on +2A/+3 ...
    velesoft velesoft January 2012 Games
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... 2As/+3s include a dedicated ROM (ROM 0) which is the ... original 48K ROM. Can you do this ... +3 models contain 64kB rom. One 16kB part is ... is incompatible with original ZX48 rom. On models +2A/+ ... is not two bytes #FF+#FF but different values, then ...
    velesoft velesoft January 2012 Games
  • Another custom loaderI got into my hands a cassette with compilation of Polish programs. most of them MIA. Unfortunately some of them are saved with a kind of custom loa…

    ... close to the ROM ones,
    use the ROM loader (from 05C8 ... ,b86f
    0xF87A ld a,ff
    0xF87C scf
    0xF87D ...
    lfaria lfaria February 2012 MIA/STP/SDP
  • BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…

    ... high

    The original rom of Spectrum (48 KB model ... 79 $04ts
    cp $ff ; 8096 fe ff $07ts
    jr nz ...
    Z80user Z80user March 2012 Emulators
  • Spellbound 48k issues with ToastrackIve been busy converting a lot of games to +D disk, everything was going smoothly until I tried Spellbound, loading in 48k mode on the toaster it res…

    ... Ram Turbo's got a ROM cartridge port, hasn't it ... fixed by creating a modified ROM that did have a suitable ... area of FF bytes (moving or stubbing out ... in a cartridge with that ROM before loading Spellbound.
    John Elliott John Elliott April 2012 Games
  • Is there a ROM modification (48K) for load without typing LOAD""?The target is to play with 48K machines with keyboard broken, or an alternative solution for new clones like Superfo instead of making a new keyboard…

    ... ; ( is SUB $E0 in standard ROM )

    LD ($5C74), ... />
    LD (IX+$01),$FF ; set first byte of ten ... character filename
    ; to $FF as a default to signal ...
    Dr BEEP Dr BEEP April 2012 Development
  • ISO-Copy - Individual Software revisitedHi folks In another thread about Supertape: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36203[/url] ... we touched on ISO-Copy by th…

    ... pilot tone ?
    So the FF FF FE 74 HEX... the actual ... could probably get away with ROM timings of 855 1710 ?
    Andrew Barker Andrew Barker May 2012 MIA/STP/SDP
  • Odd versions of the Multiface One.I've been looking through the adverts for the Multiface One and it's clear that there were a number of versions available. Note the earliest advert …

    ... - but does '00' instead of 'FF' indicate a different version? (I ... Spectaculator has the usual E4, FF numbers, and matches the CRC32 ... changes whenever I modify the ROM (add 1 to any byte ... overwriting the MF1 ROM with the MF128 old rom and see if ...
    Jmk Jmk June 2012 Hardware
  • Odd versions of the Multiface One.I've been looking through the adverts for the Multiface One and it's clear that there were a number of versions available. Note the earliest advert …

    ... case, have just dumped the ROM, checked it over, and... (drum ... same CRC32 as the E4 FF version - 4B31A971. I wonder if ... not to do with the ROM at all but something else ... />
    I suppose disassembling the ROM is the only way to ...
    Ant Ant June 2012 Hardware
  • Switching 48/128 modes within a BASIC programI'm not sure what use this would be; ie. being able to switch between 48k and 128k modes and back again from within a continuously running BASIC prog…

    ... et al. for the various ROM disassemblies which were invaluable in ... ;STMT-RET (+2A/+3/+3e ROM.1)
    push hl
    LD A,$ff
    LD (23610),A ; ... hl,$0014 ;address of $FF in BASIC ROM, for report "0 OK ...
    Battle Bunny Battle Bunny July 2012 Sinclair Basic
  • Switching 48/128 modes within a BASIC programI'm not sure what use this would be; ie. being able to switch between 48k and 128k modes and back again from within a continuously running BASIC prog…

    ... ;STMT-RET (+2A/+3/+3e ROM.1)
    push hl
    LD A,$ff
    LD (23610),A ;reset ... hl,$0014 ;address of $FF in BASIC ROM, for report "0 OK ...
    Einar Saukas Einar Saukas July 2012 Sinclair Basic
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    There was always that trick of pointing at the long run of FF bytes in the original 48K ROM and using that as a table instead (along with a JP - or was it JR - at 65535) to save room, but of course that caused compatibility issues of its own.
    Ant Ant August 2012 Development
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    ... long run of FF bytes in the original 48K ROM and using ... already. The initial two &FF bytes were preserved in the ...
    chev chev August 2012 Development
  • Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…

    ... . wiil run)
    * merge the ROM/CS lines on the edge ... anything that checksums the 48 ROM or needs the 257 byte ... tables of &FF will work, and anything that ...
    chev chev August 2012 Sinclair Miscellaneous
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... and H jumpers) at the ROM chip.
    But, according to ... pin is connected to the ROM chip. This resulted in strange ... electron beam include using port $FF to wait for the horizontal ...
    mcleod_ideafix mcleod_ideafix November 2012 Hardware
  • Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …

    ... /> call $1601 ; ... and call the ROM routine to activate it
    cp $FF ; is it FF?
    jr z,msgecc ... /> I've looked at the ROM disassembly but my brain starts ...
    snigfarp snigfarp November 2012 Development
  • Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …

    ... /> call $1601 ; ... and call the ROM routine to activate it
    cp $FF ; is it FF?
    jr z,msgecc ... ,$08,$11,$08,$10,$08,$FF

    ; pre-defined messages ...
    snigfarp snigfarp November 2012 Development
<1…10111213141516…34>

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