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  • Schematic of MULTIFACE 128Exist schematic of Multiface 128 ? I find on WOS only pictures of PCB layers. I mix both layers for possibility make schematic from picture, but it's…

    ... is A11 adress line of eprom 8kB not connect. Now is ...
    velesoft velesoft July 2012 Hardware
  • Schematic of MULTIFACE 128Exist schematic of Multiface 128 ? I find on WOS only pictures of PCB layers. I mix both layers for possibility make schematic from picture, but it's…

    ... is A11 adress line of eprom 8kB not connect. Now is ...
    velesoft velesoft July 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    Hi!

    I almost forgot that someone, once, asked to me about this interface. I made some photos and read EPROM contents.

    Here you have all the information I have:
    [url]http://www.atc.us.es/~rodriguj/messenger_samcoupe.zip[/url]
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... made some photos and read EPROM contents.

    Here you ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... chip and RAM_CS go to EPROM chip
    2) info about ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... chip and RAM_CS go to EPROM chip
    2) info about ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... used to map/unmap the EPROM/SRAM. Any write operation to ... this port unmaps EPROM/SRAM. Any read operation to ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... incomplete, as you are enabling EPROM and RAM on any access ... />
    Besides... Isn't the EPROM paged at 0000-1FFFh and ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... incomplete, as you are enabling EPROM and RAM on any access ... />
    Besides... Isn't the EPROM paged at 0000-1FFFh and ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... used to map/unmap the EPROM/SRAM. Any write operation to ... this port unmaps EPROM/SRAM. Any read operation to ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... GAL schematic to fix the EPROM/RAM decode logic, and to ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    MESSENGER is interface with 8kB EPROM + 8kB SRAM (the same function ... different ports)

    In EPROM is used only first 528 ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... 17 = N_SERIALOUT ; /* */


    /* EPROM and RAM chip selects */
    - EPROM/RAM are mapped whether port ... for instruction fetch.
    - EPROM/RAM are unmapped when port ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... . If the equations are correct, EPROM should be maped in automatically ... to a port that causes EPROM/RAM to be mapped. I ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... . If the equations are correct, EPROM should be maped in automatically ... to a port that causes EPROM/RAM to be mapped. I ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... . If the equations are correct, EPROM should be maped in automatically ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... ]MESSENGER is interface with 8kB EPROM + 8kB SRAM (the same function ... different ports)

    In EPROM is used only first 528 ...
    flopping flopping August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... you can use 2kB eprom memory in eprom socket but pin 26 ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... 't do anything (should map EPROM)
    - Port FF6Fh write operation ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... 't do anything (should map EPROM)
    - Port FF6Fh write operation ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... .
    - Port 77 reads (maps EPROM) ok.

    So now ... the part in which the EPROM/RAM is automatically mapped upon ... simulate a NMI with mapped EPROM, I've executed this little ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... .
    - Port 77 reads (maps EPROM) ok.

    So now ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... , because ROMCS is active and EPROM isn't), then it will ... ROM, but if this happens, EPROM and RAM should be active ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... />
    Test messenger with removed eprom and sram from sockets...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... ;644821]Test messenger with removed eprom and sram from sockets...[/quote ... ]
    RAM and EPROM out. With your equations, it ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... not to automatically map the EPROM under some circumstances.

    EPROM?

    UPDATE: while performing ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... gate. When using a standard EPROM 27128 (or 27256 filled with ...
    roko roko August 2012 Hardware
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... gate. When using a standard EPROM 27128 (or 27256 filled with ...
    Johan1973 Johan1973 August 2012 Hardware
  • divide loading errorsHi All, Just bought a divide unit and I am having a few problems. I select the TAP file from the fatware browser, then do a load "". I get a lot of …

    ... and write it to an eprom and see what happens. Good ...
    jagman5994 jagman5994 August 2012 Hardware
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... /> [*]If you can program an EPROM, sort yourself out a very ... of doing your own test EPROM, use someone elses... (see [URL ...
    1024MAK 1024MAK August 2012 Hardware
<1…26272829303132…34>

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