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<1234567…34>
  • Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code: [CODE] ;; ram-check L11DA: LD H,D ; Transfer the top value to the HL register LD L,E …

    ... pair.

    ;; RAM-FILL
    L11DC: LD ... ROM - $3F ?
    JR NZ,L11DC ; Back to RAM ... ROM - $3F ?
    JP NZ,L11DA ; Back to RAM ... /> ;; RAM-READ
    L11E2: CP H ; Have we reached ROM - ...
    antoniovillena antoniovillena April 2012 Development
  • TESTROM3 - utility/rom for test your ZXHere is TESTROM3 utility as 16kB ROM file + flasher for install this rom to divide eeprom (or mapram mode). Work also on ZX Spectrum without ROM and …

    ... is TESTROM3 utility as 16kB ROM file + flasher for install this ... ZX Spectrum without ROM and RAM - use only divide rom !


    rom image.

    features:
    tested ZX ram page (7=white,6=yellow,5 ...
    velesoft velesoft August 2012 Sinclair Miscellaneous
  • Write to ROM=crash?I've read in quite a few places that writing to the ROM causes a crash but on the assembly listing the comments for poke say: "Happily no check is ma…

    I've read in quite a few places that writing to the ROM causes a crash but on the assembly listing the comments for poke say:
    "Happily no check is made as to whether ROM or RAM is addressed."

    Does this mean that pushing a value when SP
    Unique Unique February 2005 Development
  • divIDE issuesI discovered a few issues with the divIDE hardware and FATware software that may be of interest to some people. 1. ROM paging If your Spectrum is a…

    ... . ROM paging

    If your Spectrum is able to page RAM over ... the BASIC ROM the paging is ... will still cause it to page in and so must be ...
    chev chev October 2005 Development
  • Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …

    ... />
    ; copy BASIC ROM to RAM

    ld hl ... ldir ; copy

    ; page shadow RAM into ROM area

    ld ...

    ; patch BASIC ROM to prevent overwrites


    ; MicroSource ROM patch (copied to $18fe)
    chev chev March 2007 Emulators
  • The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…

    ... appears as simply 32K of RAM, with the registers in ... as you would some paged RAM. That's what I' ... is it's easy. Just page in the right part, ... will reduce the number of page latches required in the ... the eventual ethernet board's ROM and RAM, and then only two ...
    Winston Winston November 2007 Hardware
  • Adventures in Programmable Logic Part 2So, now armed with an Xilinx Parallel III cable, an XC9536 CPLD, a breakout board with power, a JTAG pin header and a 44-pin PLCC socket, I could try…

    ... the memory page registers for the flash ROM, workspace RAM and W5100
    page-in or page-out).
    - various event ...
    Winston Winston December 2007 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 …

    ... happen after the ROM clears down all of RAM).

    ... entry point in the BASIC ROM, which is not an option ... wrapper somewhere in RAM to cause a ROM page-in and the ... a call in the BASIC ROM to reserve some space, ... at the top of RAM and doing what the ...
    Winston Winston July 2008 Development
  • converting ZX128 software for SAM COUPESAM COUPE is computer compatible with ZX48 model. Use same ports, same keyboard with compatible membrane, 64kB adress space with possibility connect …

    ... adress 0 original ZX 48 rom to ram memory with write protect ... as ZX128
    - page 5 is additional page, not mirrored to adress ... space 16384-32767
    - page 2 is morrored to adress ... second ZX videoram, page 7 is used only as ram
    - in ...
    velesoft velesoft April 2010 Games
  • ula bookula book is here: [url]http://www.zxdesign.info/book/[/url] can i post sam coupe stuff here - she kind of is a speccy if you stuff the speccy rom i…

    ... you stuff the speccy rom in ram please?
    please ... description of that is on page 246

    ... the kind of
    page 83
    due to ... incompatible !

    page 111 fig 12-6
    ram is not internal rom speed as external ram will ...
    Roger Jowett Roger Jowett September 2010 Hardware
  • ZXC3 Rom CartridgeI recently aquired a ZXC3 Cartridge Rom from [URL="http://www.fruitcake.plus.com/"]Paul Farrow[/URL] fully populated with the latest diagnostic softw…

    ... recently aquired a ZXC3 Cartridge Rom from [URL="http://www.fruitcake ... thing and if you have rom capability (Ram turbo, IF2 etc), this ...
    Macc Macc December 2010 Hardware
  • 128k RAM paging from BASICI'd always thought that OUT had to be used to page RAM, which from BASIC would be an "OUT 32765,ddd" command, although I don't know if just doing tha…

    ... had to be used to page RAM, which from BASIC would be ... system variable) will switch in page 'n'. I suppose that means ...
    Battle Bunny Battle Bunny August 2011 Sinclair Basic
  • Velesoft's ZX128+2 with 1.5MB memoryMy old ZX128+2 PROFI (grey model - spanish version) for sale here: [url]http://aukro.cz/super-zx-spectrum-128-2-1-5-mb-i2738723874.html[/url] Back s…

    ... modified:

    - extended ram memory to 1024 kB (1 ... />
    - support ZX rom emulation in extended ram

    - contain ... User can change any 16kB rom page and later switch between all ...
    - support allram mode (MB02 ram).

    I don't ...
    velesoft velesoft October 2012 Sales
  • Hardware description - DivIDE interface[B][U]DIVIDE interface / DivIDE 2k11[/U][/B] [B][U]The main description[/U][/B] DIVIDE is IDE interface with own external memory. Thanks to very goo…

    ... mode ram page 3 with write protect are used instead 8kB ROM(rom emulation ... select ram page 3, then this ram page is write protected (bacause ram 3 contain ROM ... image for rom emulation ...
    velesoft velesoft August 2013 Hardware
  • Hardware description - MULTIFACE 3[B]Hardware description - MULTIFACE 3[/B] This is description of MF3 clone, because I can't find more about original interface. Schematic and PAL ch…

    ... contain 16kB rom organised as two 8kB rom pages + 8kB ram. Interface ... reset/power-on is set rom page 1. In any time ... #BF,xx for select 8kB rom page 0/1:
    OUT # ... - bit D0 select 8kB rom page(D0 in log.0=set ... - bit D0 select 8kB rom page(D0 in log.0=set ...
    velesoft velesoft August 2013 Hardware
  • New MEMFACE projectMEMFACE is my old project, but never finished. Now is PCB done (at the post office) and I write firmware for CPLD. MEMFACE is interface with external…

    ... features/functions:

    - rom page with bios (after start-up ... external ZX48/128/+3 rom (may be +3e rom)
    - full ... allram mode)
    - external rom can full replace internal zx ... devices
    - all ram features
    - rom switching 16kB mode for ...
    velesoft velesoft November 2014 Hardware
  • The history of ESXDOS, the DivMMC and the DivMMC EnJOY![img]http://benophetinternet.nl/hobby/divmmc_history/1%20esxdos.jpg[/img] These are the stories behind esxDOS, the most popular operating system e…

    ... /> Custom ROM in ROM-A
    DRAM in ROM-B with ... br />
    --------------------------
    ROM and RAM in More Detail
    --------------------------
    page 7 so it suxx)< ... DIVIDE, but there are more ram pages available.

    bverstee bverstee October 2015 Hardware
  • Shadow of the Unicorn loader for +2A / +3hi, i have tried to load SotU with the [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0023000"]RAM loader from Fraser Ross[/url], which is l…

    ... infoseekid.cgi?id=0023000"]RAM loader from Fraser ... linked from the SofU page.
    On my ... the loader uses ram page #4 for rom, and ram page #4 should ... whether the WoS page about contended ram pages on +2A ... correct?
    Is the ram page #4, when paged in ...
    Kio Kio February 2016 Games
  • New Utility ZXSTLC[b]New Utility ZX Spectrum Tape (& Disk) Loader Creator[/b] I made this utility to easily create tape and +3 disk loaders for my projects and have…

    ... t cut it especially for page/bank 7 which clashed ... utility can restore each memory page fully enabling me to use ... memory banks, while using the ROM loading routines to maintain compatibility ... after this address.
    | Each page is compressed so the blank ...
    TomD TomD August 2020 Brand new software
  • compatibility between ZX computers?Hey all, I'm new here :) I was wondering about compatibility between ZX computers. Is it possible to run a game made for ZX80 on a ZX Spectrum? Or a …

    ... pages in the 64k addressable RAM - that doesn't need ... space so you can page RAM 7 into the top ... of the RAM and have the screen ... RAM 7 leaving the memory map as:

    ROM
    RAM ... 5
    RAM 2
    RAM 7 - Screen
    cyborg cyborg July 2003 Sinclair Miscellaneous
  • compatibility between ZX computers?Hey all, I'm new here :) I was wondering about compatibility between ZX computers. Is it possible to run a game made for ZX80 on a ZX Spectrum? Or a …

    ... pages in the 64k addressable RAM - that doesn't need ... space so you can page RAM 7 into the top ... of the RAM and have the screen ... RAM 7 leaving the memory map as:

    ROM
    RAM ... 5
    RAM 2
    RAM 7 - Screen
    Dr BEEP Dr BEEP July 2003 Sinclair Miscellaneous
  • TZX and the ZX81Evenin All. EightyOne is now is a state where I can support a more descriptive tape format. I know how some people have been calling for tzx suppor…

    ... to work with the SP81 ROM file, but everytime I choose ... the alternative ROM, it resets the emulator to ... eventually eat 100% of my RAM!

    I've tried ... seperate ZIP download from the ROM page. All sorted thanks :D
    b00mzi11a b00mzi11a September 2004 Emulators
  • Currah MicrosourceHi Anyone here got a Currah Microsource ? I have one, its one of the original eval units complete with 'draft' manual. Just interested to see how …

    ...
    It uses LET to page in (according to my google ... control signals in order to page? The Currah Speech unit ... the bus for that to page. Could this be the ... fact that the paged ROM disabled interrupts once the ... copy of the sinclair ROM in RAM. If they no longer ...
    BloodBaz BloodBaz October 2006 Sinclair Miscellaneous
  • Currah MicrosourceHi Anyone here got a Currah Microsource ? I have one, its one of the original eval units complete with 'draft' manual. Just interested to see how …

    ... residing in my Spectaculator emulator RAM. Thanks Woody once again for ... used to copy the MicroSource ROM to RAM and save it out ... REM ! di
    35 REM Page In
    40 REM ! ld ... REM ! ldir
    95 REM Page Out
    100 REM ! ld ...
    BloodBaz BloodBaz October 2006 Sinclair Miscellaneous
  • DivIDE and RWAP's DiwIDE*Opps, sorry, wrong forum, this thread must be in hardware topic.* I was planning to get a divide from Rwap, but I'm too afraid of long way the devi…

    ... is possible to emulate another ROM page by MAPRAM, it requires ... Control register reserved for RAM pages... but just to ... 128k RAM.

    Now for addressing additional ROM. It ... important for developers that ROM and RAM are paged independently. Since ...
    baze baze January 2007 Development
  • Galaksija emulator for ZX Spectrum +3/+2A(black)This is a NEW program/utility/game pack for ZX Spectrum. It is basically an emulator of an ex-Yugoslav computer "Galaksija" which is also Z80 based. …

    ... return $FF.

    To page RAM into the bottom 16K:

    To page the normal BASIC ROM back in:

    Tom-Cat Tom-Cat March 2007 Emulators
  • Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …

    ... /OUT to page memory (in order to perform BASIC ROM calls) otherwise ... at some unintentional place within ROM or RAM.
    BloodBaz BloodBaz March 2007 Emulators
  • Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…

    ... or Am29F040 NOR flash ROM (any 128Kbyte to 512Kbyte ... when the ROM is paged in and which page gets ... a general purpose flash ROM board, especially to those ... as a general purpose ROM board (probably just a ... of a 16K rom page, or copying a program into RAM)
    ...
    Winston Winston April 2007 Hardware
  • InterfaceHi I'm building a spectrum emulator. I've tried to build it as modular as possible, for example I have a zx class that have input and output devices…

    General ROM paging is all ... in a Spectrum (both ROM and RAM) has what are known ... this will either be the ROM chip (for addresses < ... bank (the way the RAM gets selected is slightly different ...
    Concentrating purely on the ROM, when the Spectrum reads from ...
    Winston Winston May 2007 Emulators
  • 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…

    ... #FF, it allows Betadisk ROM to change RAM pages via #7FFD.
    ROM. Having vector in RAM will not work ... ISR in RAM starts being executed, TR-DOS ROM gets paged ... installs RAM physical page #0 instead of ROM. This locks out any ROM page, even ...
    Sonic Sonic May 2007 Hardware
<1234567…34>

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Related Threads

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  • RAM Test ROM?Found a link to this: <br /> [url]http://www.retroreview.com/iang/TestSpec4.zip[/url]<br /> in another thread, and fired it up in SPIN, but I have no…
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  • 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…
  • Paging for 64Kb of Video Ram??? What is the best way to page this?Hi all,<br /> <br /> I'm just putting together a concept card for a "Loki" style of video card, which supports shadow ( so it fits a normal Speccy …

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