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<1…11121314151617…34>
  • 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 …

    ... ; $3c00 (address of characters in ROM) / 8
    add a,l ... ; a should be $A0..$ff ($80 OR $20..$7f)
    ROM
    add hl,hl ;
    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 …

    ... you're not calling any ROM routines which use the E_LINE ... /> Thanks for that. The only ROM routines I plan to use ... pointer is up in the $FF..s somewhere. If I change ...
    snigfarp snigfarp November 2012 Development
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... WD1793(9) WD1793(9)
    #FF/255 xxxxxxxx11111111 xxxxxxxx1xxxxx11 FDsys(6 ... CF is only in ZX rom. (+3e rom and 48rom by Pera ... ,etc....). And +3e rom with CF support use rom paging = divide systems ... are unusable with this 48 rom.
    velesoft velesoft December 2012 Hardware
  • Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…

    ... shortest solution:
    [CODE] or $ff ; reset Z flag
    call ... ]

    Notice every 48K ROM contains the following instructions at ... will automatically switch to 48K ROM by default when assembly routines ...
    Einar Saukas Einar Saukas February 2013 Sinclair Miscellaneous
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... ff ff ff ff ff ff ff ff ff
    2020 ff ff ef ff ff ff ff ff ff ff ff ff ff ff ff ff
    2030 ff
    zub zub March 2013 Hardware
  • Tracking down the last few bugsHi all. My emulator nears completion. Like many, I have tested against the FUSE suite of tests, and my emulator passes every one. However, I still h…

    ... , and:

    CB ROM [00-ff] 5 + 3
    CB RAM ... [00-ff] 5 + 3

    in ... CB instructions?
    But why ROM and RAM?
    Oibaf Oibaf March 2013 Emulators
  • Tracking down the last few bugsHi all. My emulator nears completion. Like many, I have tested against the FUSE suite of tests, and my emulator passes every one. However, I still h…

    ... , and:

    CB ROM [00-ff] 5 + 3
    CB RAM ... [00-ff] 5 + 3

    in ... *!)

    [quote]But why ROM and RAM?[/QUOTE]

    ROM or RAM like they can ...
    Woody Woody March 2013 Emulators
  • 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…

    ... game read attribute port #FF for screen sync in ... ZX clones without port #FF game halt....
    Next ... I = #39. ZX rom on +2A/+3 models not ... adress #39FF two bytes #FF,#FF = IM2 interrupt jump to ... all ZX roms) and disabled "#FF synchronisation" :
    [url] ...
    velesoft velesoft April 2013 Games
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... have expected the 'DOS ROM' to contain the same ... first byte as the Spectrum ROM in this case, although ... 0016 (returning from RG ROM to 48 ROM), you get a RET ... to the $0280 (48 ROM to RG ROM) RET (which is $ ... RG:
    1FDB RST $38 ($FF)
    1FDC XOR $1B ($EE ...
    Jmk Jmk April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... of the 4116ses (00 & FF) usually is shown as 8 ... and via resistors to Z80 + ROM + higher RAM.
    roko roko May 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... of the 4116ses (00 & FF) usually is shown as 8 ... and via resistors to Z80 + ROM + higher RAM.[/QUOTE]

    deadeye deadeye May 2013 Hardware
  • Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…

    ... ? Z80CPU need stable vector value #FF on data bus, because some ... CPU read different vector than #FF = CPU read different adress of ... with IM2 table in zx rom (I=#3B,etc...)
    velesoft velesoft May 2013 Hardware
  • Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…

    ... ? Z80CPU need stable vector value #FF on data bus, because some ... CPU read different vector than #FF = CPU read different adress of ... with IM2 table in zx rom (I=#3B,etc...)[/QUOTE]
    Dan Antohi Dan Antohi May 2013 Hardware
  • Idk>le me browsing through some game's code >..... [code]61A8 F5 push af 61A9 3EFF ld a,FF 61AB D37F out (7F),a 61AD D33F ou…

    ... first require the TR-DOS ROM to be paged in in ... from within the TR-DOS ROM itself under normal conditions. Hence ... -DOS loader bypassing the standard ROM procedings in order to do ... #1F last, keep polling #7F/#FF for data I/O and ...
    Hikaru Hikaru June 2013 Development
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... use standard trick with the ROM vector table and I=#39 ... to find an address in ROM, which looks like #xxFF and ... on the minute detail of ROM implementation. It also will not ... the bus does not return #FF, which can be the case ...
    introspec introspec June 2013 Development
  • Spike: 48k onlyDoes anyone know what's going on with Spike? [URL=http://s1142.photobucket.com/user/daveyboyhughes/media/spike_zps232a1745.gif.html][IMG]http://i114…

    It's because the game code has a decryptor which uses the ROM and in the original 48k ROM, $386e-$3cff contains $ff which are not present in the 48K mode 128k. Hence, it nearly works but not quite.
    Bandit Bandit June 2013 Games
  • Spike: 48k onlyDoes anyone know what's going on with Spike? [URL=http://s1142.photobucket.com/user/daveyboyhughes/media/spike_zps232a1745.gif.html][IMG]http://i114…

    ... the ROM and in the original 48k ROM, $386e-$3cff contains $ff which ...
    R-Tape R-Tape June 2013 Games
  • Spike: 48k onlyDoes anyone know what's going on with Spike? [URL=http://s1142.photobucket.com/user/daveyboyhughes/media/spike_zps232a1745.gif.html][IMG]http://i114…

    ... the ROM and in the original 48k ROM, $386e-$3cff contains $ff which ...
    Mousey Mousey July 2013 Games
  • Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…

    ... Variables as there are no ROM calls.

    Also on ... the interrupt address is always $FF.

    I use $5CFF ...
    dbolli dbolli July 2013 Development
  • FZX: a new standard format and driver for proportional fonts[B]FZX[/B] is a very compact and efficient (although extremely flexible and powerful) standard format to create new fonts for the ZX-Spectrum. It sup…

    ... I replaced the terminator with $ff. Now printing always works, but ... -effects could occur especially if ROM routines were used in the ... driver (some ROM routines that have to do ...
    clausjahn clausjahn July 2013 Brand new software
  • Barn find #4I think this is some sort of backup device. Its got "007" on the motherboard and the mice have chewed the buttons. Will do a little research later in…

    ... by paging out the BASIC ROM (by forcing /ROMCS high), ... , the paging of the ROM will have no effect on ... held high so the BASIC ROM cannot be accessed). So ... area, it will get the FF hex floating bus value unless ... just have to copy the ROM SAVE routines to high ...
    1024MAK 1024MAK August 2013 Hardware
  • Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…

    ... am cheating and using a ROM routine... but I am but ... nightmare....

    Whats the ROM magic?

    Time to ... look up the Rom Dissasembly book.. (very nice!)
    STREAM FF LEADS TO CHANEL 'R'
    wibble wibble September 2013 Development
  • 128 BASIC-compatible way of loading BASIC as code?On a 48K Speccy (or from 48 BASIC or USR 0 mode on a 128K machine), one can do a silly trick like this: [code];; load a 4000 byte BASIC program ld i…

    ... /> dec a ;A =$ff, Carry reset for SAVE< ... /> ld a,$ff
    scf ;A =$ff, Carry set ... RET (+2A/+3/+3e ROM.1)
    push hl ... hl ;stack ROM return address
    LD A,$ff
    ...
    Battle Bunny Battle Bunny September 2013 Development
  • Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …

    ... of the Sinclair ZX Spectrum ROM, but instead, the code ... #7F; Page in ROM
    RAM EQU #FF; Page in RAM< ... RET
    ;
    COPY_R OUT (ROM),A; Page out RAM
    LDIR
    OUT (ROM),A; Page out RAM
    Dan Antohi Dan Antohi September 2013 Hardware
  • Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …

    ... -
    #7F/127 xxxxxxxx01111111 xxxxxxxx01111111 - ROM>CPU0
    #9F/159 ... CPU0Paging&WR-on
    #FF/255 xxxxxxxx11111111 xxxxxxxx11111111 - RAM> ...
    Black_Cat Black_Cat September 2013 Hardware
  • Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …

    ... xxxxxxxx00111111 Pag-on,B28=0 ROM>CPU0&WR-off ... ;CPU0&WR-on
    #FF/255 xxxxxxxx11111111 xxxxxxxx11111111 - IF1bisROM> ...
    Black_Cat Black_Cat September 2013 Hardware
  • Interface 1bisHas anyone on here got a "Interface 1bis": [URL="https://sites.google.com/site/interface1bis/"]https://sites.google.com/site/interface1bis/[/URL] I …

    ... xxxxxxxx00111111 Pag-on,B28=0 ROM>CPU0&WR-off ... ;CPU0&WR-on
    #FF/255 xxxxxxxx11111111 xxxxxxxx11111111 - IF1bisROM> ...
    Dan Antohi Dan Antohi September 2013 Hardware
  • What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…

    ... published in The Complets Spectrum Rom Dissasembly.

    ... (D
    cannot hold +FF.)
    EX AF,A'F ...
    header and +FF for a block of
    jamorski jamorski October 2013 Development
<1…11121314151617…34>

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