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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…

    According to the Complete Shadow ROM disassembly, the function that exits ... ,+1BF4 Return address to main ROM is
    05CC RST 18 ...
    Winston Winston March 2008 Development
  • 128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…

    ... />
    [code]
    ; 128 rom paging routine
    ; use rst 28h ...

    ;;rom0

    paging
    org 0x0028
    ld ...
    chev chev August 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
  • 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 so ...
    Jimmy Jimmy March 2008 Emulators
  • ROM paging questionAssuming the Spectrum 128 memory map and port addresses, but two custom ROMs in place of the normal Editor and BASIC, what is the most efficient way …

    ... calling a routine in ROM-1 from ROM-0 so that ... when the routine in ROM-1 executes a RET ... of convenience assume routines in ROM-0 will use a ... the routine in ROM-1, which means the paging code needs ... The RAM part of the paging routine should live at 23296 ...
    chev chev January 2006 Development
  • 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 …

    ... Shadow ROM Disassembly book. I wondered how that rom calls the interface's rom paging ... $1708, the interface pages the shadow rom in. And when it reaches ... rom back in.

    Oh man! It's so weird paging ...
    zPasi zPasi October 2015 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…

    ... the signal high and paging in their own ROM to avoid the ... possible for another device's shadow ROM to work with an Interface ... does all hardware with a shadow ROM use that system variable?)
    shadow ROMs can peacefully co-exist ...
    Winston Winston October 2007 Hardware
  • 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…

    ... am looking for a 16K Rom-code (to fit into ... with Winstons Diag Board for Rom code storage and Piters ... the Diag board IF 1 rom paging in does not work. Therefore ... I am looking for a rom which already has the ... I found the sea change rom but the used header format ...
    maskenlos maskenlos November 2008 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…

    ... hl ; manipulate sp to handle paging errors
    ld (err_sp),hl ... ; hook code to call any shadow rom address
    ret
    ;
    jp jp August 2009 Development
  • 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…

    ... 1 compatible paging mechanism, using the ROM cartridge as a shadow ROM. This opens ... up a range of possibilities. The 4MB FLASH ROM ... in the Spectrum ROM, using the ROM cartridge as a shadow ROM. This opens ...
    Macc Macc July 2014 Hardware
  • 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
  • Currah uSpeech ROM Paging and BootyHi, When I emulated the Currah uSpeech for [url="http://www.inkland.org.uk/inkspector"]InkSpector2[/url], I made it page in its own ROM on memory …

    ... to enable the uSpeech ROM is this Booty code ... $0038 and pages its own ROM in, when the ‘ret’ ... 10 in the ZX Spectrum ROM, but since the uSpeech ... ldir instruction above) the uSpeech ROM is executed. The Z80 ... 0011 in the ZX Spectrum ROM which looks like this:
    inky inky October 2019 Hardware
  • 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: ... introduces an I/O ports paging. Original BetaDisk sits between Spectrum ... any ROM page, even TR-DOS. However I/O ports paging will ... Lprint 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…

    ... the signal high and paging in their own ROM to avoid the ... possible for another device's shadow ROM to work with an Interface ... does all hardware with a shadow ROM use that system variable?)
    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?

    ... where execution at $0038 toggles paging and I/O to port ... about the method of paging in the ROM. You've got ... 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?

    ... about the method of paging in the ROM. You've got ... 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).

    ... $0000 in the Mirage ROM — and if there's ...
    zub zub November 2007 Hardware
  • 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…

    WOS also has The Complete Shadow ROM Disassembly, which is an interesting thing to read. It also explains the paging mechanism for the IF1 ROM, and why the traps are at the addresses that they are at.
    Winston Winston November 2008 Hardware
  • How to mimic hardpaging (RST8) by softpagingA description of my experiments with porting IF1 and Opus DOS to a multipage ROM system. Someone should have found this 15 years ago. [url]http://bi…

    ... to a limited number of "shadow" ROM entry points. If you need ... , you just patch the original ROM code. Now, whether this is ... to deep metaphysical arguments :) Hardware paging would still be the #1 ... be said that these soft-paging schemes work well in real ...
    baze baze February 2009 Development
  • How to mimic hardpaging (RST8) by softpagingA description of my experiments with porting IF1 and Opus DOS to a multipage ROM system. Someone should have found this 15 years ago. [url]http://bi…

    ... .
    Not clear why Hardware Paging provides better transparency. The document ... you want to create a shadow ROM entry point, you have to ... alter the original ROM code. So, there is ... based on ROM content. This is why hardware paging might be ...
    baze baze February 2009 Development
  • DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…

    ... the ROM used is 48k, it is possible to use 128k paging ... address the code continues in shadow ROM. It would be very difficult ...
    baze baze February 2009 Hardware
  • DivIDE QuestionHi all, I've been trying to work out how the DivIDE works and after reading and re-reading the DivIDE programming model document by Zilog I think it…

    ... can use the ROM function. Read the Shadow ROM disassembly to understand ... has a trapped address for paging its rom *out* as well.< ...
    As I said, the Shadow ROM disassembly explains how this mechanism ... 0x0700 in the Interface 1 shadow ROM) that will cause a ...
    Winston Winston August 2009 Development
  • 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 ... hl ; manipulate sp to handle paging errors
    ld (err_sp),hl ... ; hook code to call any shadow rom address
    ret
    ;
    jp jp December 2009 Development
  • 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…

    ... hl ; manipulate sp to handle paging errors
    ld (err_sp),hl ... ; hook code to call any shadow rom address
    ;
    ; oops, if1 ...
    jp jp June 2010 Development
  • BITWISE operators...Hi Folks, Another question - is there a way (fast) to do bitwise operations in Sinclair BASIC? Many thanks Paddy

    ... with an open source replacement ROM. Not sure what the situation ... the hard 16K ROM limit (which would require ROM paging) SE Basic crams ... a version of the ROM that uses the shadow video RAM to ...
    chev chev August 2010 Sinclair Basic
  • 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"…

    ... />
    The hardware paging is independent of the ROM contents, so unless ... yes, it counts for all shadow ROM versions.
    mcleod_ideafix mcleod_ideafix June 2011 Emulators
  • Question about DivIDEHi guys, Tell me this... (please) DivIDE features an "auto-mapping feature transparently maps shadow ROM at important entry points". Depending on …

    ... feature transparently maps shadow ROM at important entry ... points for connect external(shadow) memory.
    < ... used on different paging port (MB02+ compatible ... to 512kB ram + 512kB rom.

    ...
    velesoft velesoft June 2011 Hardware
  • Which BASIC commands/functions affect FRAMES?Hi Folks, Does someone have a definitive list of BASIC commands/functions that affect the FRAMES counter? The list I have so far: BEEP CAT (thanks…

    ... updating of FRAMES. Searching the ROM disassembly gives seven occurrences:
    Shadow ROM disassembly to hand to check ... the place when they're paging RAM in & out ...
    Battle Bunny Battle Bunny June 2011 Sinclair Basic
  • Would things of been better if the NMI was fixed ?I was just wondering, if the NMI bug was fixed say early on in production, so for instance all issue twos (and late issue ones) and beyond had the "f…

    ... , as a more sophisticated ROM (and RAM) paging protocol and hardware would ... never supposed to have any paging at all, and BASIC was ... supposed to be extended. The shadow ROM in the Interface I was ... the QL). The most advanced paging system was the Timex Bus ...
    chev chev May 2012 Hardware
<1234567…34>

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Related Threads

  • ROM paging questionAssuming the Spectrum 128 memory map and port addresses, but two custom ROMs in place of the normal Editor and BASIC, what is the most efficient way …
  • 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:<br /…
  • Spectrum Shadow ROM Disassembly[url]http://www.worldofspectrum.org/infoseekid.cgi?id=2000371[/url]<br /> <br /> Anybody got a nice clean copy to sell in the UK?<br /> <br /> Cheers
  • 128 ROM paging alternativeWould this work (with the appropriate code in each ROM)?<br /> <br /> [code]<br /> ; 128 rom paging routine<br /> ; use rst 28h with call address sto…
  • Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too.<br /> <br /> [URL="http://www.speccy.org/foro/viewtopic.php?f=8&amp…
  • Wanted - Spectrum Shadow ROM DisassemblyHiya, if you've got a hard copy of [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=2000371&amp;loadpics=1"]Spectrum Shadow ROM Disassembly[/UR…
  • Searching for correct Betadisk 48k TR-DOS v4.12 ROM (Save ROM via TRDOS-Prompt to Disk)Hi,<br /> <br /> I have two ROM-Files which should be read out from an original Betadisk 48 Interface TRDOS v4.12 (ROM-Size 8k).<br /> But when I …
  • WANTED Machinecode Routine for Paging in Betadisk TR-DOS v5 ROMI try to build a small MCode-program which writes the TR-DOS-ROM v4 / v5 to RAM adress 40000 an up.<br /> <br /> It´s working on TR-DOS v4 / Betadi…
  • Is it possible to run a single BASIC line via a ROM CALL of the Standard ZX 48k ROM?On: https://cygnus.speccy.cz/popis_trdos-assembler.php<br /> <br /> I found the following code:<br /> [code]<br /> CHADD equ 23645 ; Location of…
  • Currah uSpeech ROM Paging and BootyHi,<br /> <br /> When I emulated the Currah uSpeech for [url="http://www.inkland.org.uk/inkspector"]InkSpector2[/url], I made it page in its own RO…

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