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<1234567…34>
  • Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…

    ... Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter ... ,+1BF4 Return address to main ROM is
    05CC RST 18 ...
    Winston Winston March 2008 Development
  • Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too. [URL="http://www.speccy.org/foro/viewtopic.php?f=8&t=408&start=53"…

    ... of memory, where the shadow ROM resides, show that the ... jump to 0700h in the shadow ROM. This location contains a ... the hardware automatically unpages the shadow ROM. As the RET instruction ... Interface 1 partially decodes the shadow ROM and therefore, the last ...
    mcleod_ideafix mcleod_ideafix June 2011 Emulators
  • Wanted - Spectrum Shadow ROM DisassemblyHiya, if you've got a hard copy of [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=2000371&loadpics=1"]Spectrum Shadow ROM Disassembly[/URL] t…

    Hiya, if you've got a hard copy of [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=2000371&loadpics=1"]Spectrum Shadow ROM Disassembly[/URL] that you're willing to part with then please send me a PM. Thanks!
    jp jp March 2013 Wanted
  • Electronic listings from Spectrum Shadow ROM Disassembly?I've been reading [url="https://spectrumcomputing.co.uk/index.php?cat=96&id=2000371"]Gianluca Carri's Spectrum Shadow ROM Disassembly[/url] book (Wor…

    ... =2000371"]Gianluca Carri's Spectrum Shadow ROM Disassembly[/url] book (World of ...
    JamesYoungman JamesYoungman December 2020 Development
  • Creating your own BASIC-commands on IF1bisThe old Sinclair IF1 has offered an easy possibility to create your own new BASIC-command: The use of the shadow variable VECTOR. This is described i…

    ... your own new BASIC-command: The use of the shadow variable VECTOR ... for different versions of the shadow ROM! For instance, the STK-END ... , somtimes on #2274, even for shadow ROMs of the same version ...
    HZJ HZJ March 2014 Hardware
  • A vexatious questionThis is kind of a follow-up to a question about RST #8 and hardware that I wrote in the development forum a while ago. To summarize that: certain ha…

    ... seems to me that two shadow ROMs on the edge ... possible for another device's shadow ROM to work with an Interface ... BASIC nor Interface 1 understands. But does all hardware with a shadow ROM ... so that two peripherals with shadow ROMs can peacefully co-exist ...
    Winston Winston October 2007 Hardware
  • If you've got a real working MF128,IF1, and MDR combo can I ask a favour?So, if you do have a real Multiface 128, Interface 1, Microdrive and, oh yeah, a Spectrum (48k or 128k) that are all working, can I ask a favour...? …

    ... Rom Check
    ; mailto: jp@drumfu.com
    ;
    ; From BASIC ... to shadow rom address
    ;
    exx ; save return to basic ... br /> exx ; restore return to basic address
    pop hl
    rst $08 ; page in shadow rom
    defb $32 ; and jump ...
    jp jp February 2008 Hardware
  • Interface 1 emulation issuesFor Virtual Spectrum v3.0 I am implementing virtual Interface 1 and Interface 2 options! The I/F2 ROM option works already, and I have got the I/F1 s…

    ... have got the I/F1 shadow ROM paging itself in and out ... (well PRINT IN 239 from BASIC returns 255). Unfortunately this means ...
    Jimmy Jimmy March 2008 Emulators
  • 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…

    ... space. Chances are that BASIC will get corrupted while attempting ... /> push hl ; preserve return to basic
    exx
    ;
    ... /> pop hl ; restore return to basic
    exx
    ;
    ... ; hook code to call any shadow rom address
    ret
    ...
    jp jp August 2009 Development
  • The Sinclair ZX Microdrive Resurrection Project (long)Dear Spectrum fans! [Management summary: Download [url]http://www.bartheld.net/temp/mdv2img.zip[/url] and tell me what you think. All help very much…

    ... Next thing was getting the basic communication right. Davide Guida's ... Gianluca Carri's "Spectrum Shadow ROM Disassembly" and a few other ... forgiving. Afterwards, the crude BASIC loader below worked like a ... load anything else but the BASIC loader saying "File not ...
    Volker Volker March 2012 Emulators
  • Z80 snapshot formatI read documentation for Z80 snapshot on WOS and see in table possibility insert ROM image to Z80 file. Here is full table: [code]The pages are numb…

    ... ------------------------------------------------------
    0 [B]48K rom rom (basic)[/B] 48K rom
    1 Interface I ...
    6 - page 3 Shadow 8000-bfff
    7 - ...
    velesoft velesoft August 2012 Emulators
  • A new ZX spectrum cloneOver the past 12 months i have been developing a new spectrum clone as a hobby project to waste my spare time on. It is still not fully complete yet …

    ... mode (hot switchable from BASIC)
    ZX spectrum 128K ... br /> Interface 1 style shadow ROM for BASIC extensions
    4 video ... FAT32 storage accessible from BASIC using Interface 1 style ... /> Improve and expand the BASIC extensions
    Improve contention ...
    mspec mspec August 2012 Hardware
  • IF1bis StabilityI just thought I would start a different thread relating to the IF1bis, and leave the copyrighters to it elsewhere...:-P I've had mine for a few mon…

    ... have to reinstall the two basic and shadow ROM files onto the system ...
    Simon_Carr Simon_Carr September 2013 Hardware
  • IF1bis Communication ErrorHello again.... I've just been working again with my IF1bis, having had to re-install the basic and shadow ROMS (probably my fault corrupting the I…

    ... had to re-install the basic and shadow ROMS (probably my fault ... , I have installed the basic and shadow ROM files, and also updated the ...
    Simon_Carr Simon_Carr November 2013 Hardware
  • IF1bis: I give up! WARNING to casual usersI guess the title of this thread really says it all. I have had an IF1bis for a number of months now, and feel that it is time to express my final fe…

    ... ZX microdrives, using native ZX Basic commands. As such, the IF1bis ... reliable, and that the basic and shadow ROM files used to run it ...
    Simon_Carr Simon_Carr March 2014 Hardware
  • New from Paul Farrow, the ZXC4This is exciting stuff!!!! Sorry if ive stepped on your toes Paul, wanted people to hear about it!!! [QUOTE]Hi I?m happy to announce the release o…

    ... paging mechanism, using the ROM cartridge as a shadow ROM. This opens up ... be used to extend Sinclair BASIC with completely new commands.
    ROM, using the ROM cartridge as a shadow ROM. This opens ...
    Macc Macc July 2014 Hardware
  • ZX81 SP ROM Disassembly<div>Hi All,</div><div><br></div><div>For anyone who is interested in ZX81 Assembler and ASZMIC ROM...</div><div><br></div><div>I have created a disa…

    ... ZX81 Assembler and ASZMIC ROM...
    I have ... the Comprocsys ASZMIC ROM or without (via ZX81 BASIC commands).
    SP ROM Disassembly Xcode project ... is available here.
    and an example BASIC ...
    dbolli dbolli June 2015 Sinclair Miscellaneous
  • Interface 1 Rom UpdateHi, I have an Interface 1 with a version 1 Shadow Rom, I would like to update it to Version 2. I think IF1 Rom v2 code could be burned into a T…

    ... 1 with a version 1 Shadow Rom, I would like to update ... .

    I think IF1 Rom v2 code could be burned ... there maybe a version 3 rom, was that ever released.
    doubledecca doubledecca August 2015 Hardware
  • Interface 1 ShadowROM pagingI read the Interface Shadow ROM Disassembly book. I wondered how that rom calls the interface's rom paging mechanism. It doesn't! I learned there is …

    ... the Interface Shadow ROM Disassembly book. I wondered how that rom calls the ... interface's rom paging mechanism. It ... the shadow rom in. And when it reaches $700, it pages the BASIC rom ...
    zPasi zPasi October 2015 Hardware
  • Checksum RoutinesHi there everybody, Does anyone have an 'off the shelf' assembler routine for generating checksums? Thanks Jim

    ... mid-June build and my BASIC checksum program works fine. ... to see if the shadow ROM should be paged in.< ... emulator to fail the ROM check in the Sinclair ... pass if there was one ROM byte different?
    I ... is that the first Interface1 ROM, written by Dr. Logan ...
    Geoff Geoff July 2006 Development
  • Total amount of memory on a Speccy ?I wonder............ The C64 (excuse me for saying that name in here. I'll hereby name it just "it") has 64k, while only 38k, or so, is available f…

    ... extra kilobyte of RAM. When shadow ROM is paged in, between adresses ... , RAM is selected instead of ROM! This memory area is used ... *41256 chips), but from +3 BASIC and CP/M, only 128K ...
    Grecu_hc85 Grecu_hc85 March 2007 Hardware
  • Interface 1 with 3.5" floppyHas this been done or can it be done? Using an interface 1 and a powered 3.5" floppy disk drive (with a modified cable) instead of a microdrive?

    ... Interface One, including rewriting the shadow ROM, I imagine), but I ... is used to alter the shadow RAM), I can't remember ... when you have access to BASIC, so it's no ... you a fair bug of shadow RAM to run (Genie ... programs), the exit-to-BASIC function, and the POKE ...
    ewgf ewgf May 2007 Sinclair Miscellaneous
  • Russian clone of ZX-Spectrum 48kThe classic russian clone of ZX-Spectrum 48k [URL="http://sblive.narod.ru/ZX-Spectrum/Leningrad48k/Leningrad48k.htm"]http://sblive.narod.ru/ZX-Spect…

    ... for direct access to Betadisk ROM because it contains NOP: ... except #FF, it allows Betadisk ROM to change RAM pages via ... called only from BASIC ROM, another - from TR-DOS ROM. BASIC's ISR returns ... parallel interface, however without shadow ROM (only I/O part).
    Sonic Sonic May 2007 Hardware
  • A vexatious questionThis is kind of a follow-up to a question about RST #8 and hardware that I wrote in the development forum a while ago. To summarize that: certain ha…

    ... seems to me that two shadow ROMs on the edge ... possible for another device's shadow ROM to work with an Interface ... BASIC nor Interface 1 understands. But does all hardware with a shadow ROM ... so that two peripherals with shadow ROMs can peacefully co-exist ...
    guesser guesser October 2007 Hardware
  • Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?

    ... paging in the ROM. You've got two basic ways of ... , though. The fact that BASIC fails to initialise when the ... call code in the IF1 shadow rom. I would guess this is ... the IF1 and calls IF1 ROM code, then on return ... stripes if you remove the ROM from a Speccy and ...
    Winston Winston November 2007 Hardware
  • Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?

    ... in the ROM. You've got two basic ways of ... call code in the IF1 shadow rom. I would guess this ... needs to call the Spectrum ROM, though, to call the ... call to the IF1 shadow ROM or the Spectrum ROM).

    ... around $0000 in the Mirage ROM — and if there's ...
    zub zub November 2007 Hardware
  • If you've got a real working MF128,IF1, and MDR combo can I ask a favour?So, if you do have a real Multiface 128, Interface 1, Microdrive and, oh yeah, a Spectrum (48k or 128k) that are all working, can I ask a favour...? …

    ... ];
    ; another if1 rom check that doesn't corrupt basic
    ; mailto ... /> ;
    exx ; restore return to basic address
    pop hl ;
    rst $08 ; page in shadow rom and
    defb $31 ; call ...
    jp jp April 2008 Hardware
  • Channels and streamsSo I've put some thought into channels and streams, and read the dead (and presumably rotting corpse) of the CSS FAQ which contains some information …

    ... trap RST 8 and extend BASIC.

    The conclusion: ... little bit unfinished in ZX BASIC - for example, it's ... add a new channel, but BASIC can't open it - ... beyond the ROM release point but the ROM was released ... exist in RAM or a shadow ROM but must be in ...
    Geoff Geoff July 2008 Development
  • 16K Rom with RS232 supportHi all, I am looking for a 16K Rom-code (to fit into the speccy) which supports RS232 and Network of IF1. Background: I am using 48K Issue 3 with W…

    ... begins at 0x0008 in the shadow ROM has an incredible detective task ... in depth, to make the BASIC extension mechanism for the Spectranet ... from the BASIC ROM from the CALBAS routine in the shadow ROM, or a ... UDP or TCP sockets from BASIC).

    The other ...
    Winston Winston November 2008 Hardware
<1234567…34>

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