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<1234567…34>
  • Switch to 48mode without 'SPECTRUM' commandIs there a poke(s) to switch to 48 mode without SPECTRUM command. I want my tape loaders to switch automatically. I know how to switch ram banks ok…

    ... there a poke(s) to switch to 48 mode without SPECTRUM command ... my tape loaders to switch automatically. I know how to switch ram banks ok, ... but not rom switch.
    < ... br /> This is how I switch ram banks in my rem loaders ...
    FrankT FrankT September 2005 Sinclair Basic
  • Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…

    ... The idea is to rewire these jumps to RAM so that a ... will simply jump to a jump to the original destination. ... table before
    the RAM test / it will get ... to rewire RST 0x08 (since IF1 HW does a page switch ... upon PC=0x0008 );

    one way is to ...
    tstih tstih July 2014 Development
  • Issue 1 16K RAM bankFolks, I recently had a chance to fix a couple of Issue 1 boards, and learned the hard way that the chips in the 16K RAM bank have a different place…

    ... /> I recently had a chance to fix a couple of Issue ... the chips in the 16K RAM bank have a different placement when ... layout is not documented anywhere, to the best of my knowledge ... />
    It therefore feels appropriate to have it documented here, in ...
    Falco-F8L Falco-F8L January 2015 Hardware
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... separate sprite in RAM 0, and then switch to RAM 7 to draw it.
    to write to in at 0xc000. Store the data in bank 5 at ... the screen and page in bank 0 to do any additional code ... to do, and 10K for game data (after the screen in bank 5 ...
    chev chev August 2010 Hardware
  • 128K programmingDoes anyone know any good resources on assembly programming for the 128? All I'm after is an "idiot's-getting-started-guide" on how to utilise the…

    ... first to bank 0...

    out (c),a ; ... make the switch...
    ; the same bank we wrote to earlier
    ; meaning the switch hasn't ... ,16384 ; Wipe every byte of RAM bank 5
    ld de,16385
    Mysterion Mysterion February 2016 Development
  • New Utility to Transfer Z80 Snapshot to +3 DiskSince getting a Gotek for my +3 it has been my go to machine. The biggest downside however is the lack of older games on disk format with pretty much…

    ... page 5 into page/bank 2 and decompress to page/bank 5
    6) Switch to special ... decompress rest of page/bank 5 to page/bank 5
    5) Switch to special mode which has ... and RAM drive
    3) Directly decompress loading screen to page/bank 5 (0x4000 to ...
    TomD TomD May 2019 Development
  • New Game to Your TOP 5?Hi, Simple YES/NO answer will do: do you think there still exists a Spectrum game that is unknown to you but would make it to your TOP 5 of Spectrum…

    ... but would make it to your TOP 5 of Spectrum games? (not ...
    SpecMem SpecMem November 2005 Games
  • Copy interface ROM content to RamHi all, I have a very rare logitec centronics and disc interface. To save its ROM content I would like to copy it Ram and store it somewhere. How ca…

    ... content I would like to copy it Ram and store it somewhere ... ? Small MC routine to copy from Ram area to Ram area could be sure ... familiar with MC). But How to be sure that the Interface ...
    maskenlos maskenlos July 2008 Hardware
  • I want to add a power switch to +3Any body know the best way to add a power switch to a +3 ???? cheers CodenameV

    Any body know the best way to add a power switch to a +3 ????


    cheers CodenameV
    CodenameV CodenameV October 2009 Hardware
  • 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 …

    ... JR NZ,L11DC ; Back to RAM-FILL if not.
    ... JR Z,L11EF ; forward to RAM-DONE if faulty.
    ... Z,L11E2 ; back to RAM-READ if zero flag ... JP NZ,L11DA ; Back to RAM-FILL if not.
    ...
    antoniovillena antoniovillena April 2012 Development
  • Adding On/Off switch to ZX +2Hi all Looking at adding a power switch to my +2. Has anyone done this, is there a guide anywhere? Ta B

    Hi all

    Looking at adding a power switch to my +2.

    Has anyone done this, is there a guide anywhere?

    Ta
    B
    Beaps Beaps July 2014 Hardware
  • My first attempt at Gigascreen interlacingWonderful. Did some research on the port which controls memory paging and wrote a short BASIC programme to switch pages 5 and 7 in and out of the scr…

    The +3s has nothing to do with the trick I described. It works because the picture is interlaced. You will see half of the picture from ram bank 5 and half from ram bank 7.

    [ This Message was edited by: Fraser on 2004-05-03 14:24 ]
    Fraser Fraser May 2004 Development
  • Memory paging in 128 KB - 64KB RAM possible?I have found a quote in Spectrum 3 manual (available at WOS) -------------------- In the +3, we have crammed in more than twice the amount of memory…

    ... have been left trying to adequately describe +2A ... bank 5. Detect the +3 by attempting to switch to the 4/5 ... , switch to ROM/5/2/3, copy the ROM to bank 4 ... and your game to banks 5 ... /6/3, switch to 4/5 ...
    John Elliott John Elliott March 2008 Development
  • ANN: ResiDOS v2.25 and +3e ROMS v1.38 releasedA major new release of ResiDOS, v2.25, is now available! The most important new features are commands and functions allowing new extended streams an…

    ... version for original DivIDE (32kB ram), but only first two ... copy of BASIC ROM (eg RAM bank 0 for most interfaces) is ... a RST 8 (switch to ResiDOS bank).
    [*]ResiDOS bank (1) active.
    switch would have to save the existing bank back to disk (of ...
    glancaster glancaster July 2009 Hardware
  • Copying data between memory banks in USR0 modeI am experimenting with Funky Fungus to load the majority of its data (levels, screens, music etc.) into memory banks 1, 3, 4, 6 and (partly) 7 by sw…

    ... stack below paged RAM.

    To select which bank to page in in ... stuck with bank 5 as it doesn't know how to write to bank 7 ... 49152.

    To copy it to the screen (bank 5) just use:
    to use bank 5 as a buffer and ...
    chev chev September 2013 Development
  • +2 DIAGNOSTICSIs there a diagnostics test available for the spectrum 128 (+2) in tzx format? I've just obtained a spectrum +2 Grey and all looks fine with it on f…

    ... computer will attempt to set the border colour to indicate where ... to indicate which RAM bank was found faulty:
    ; RAM bank 7 - Black.
    ; RAM bank ... 6 - White.
    ; RAM bank 5 - Yellow.
    ; RAM bank 4 ...
    balford balford December 2014 Hardware
  • EmuZwin 128k banks in assembler Having looked at the assembler help file " ORG [{ RAMn | ROMn },] #target_address [, #dest_address ] Defines target assembling address and ta…

    ... /> A workaround might be to assemble to $C000 / 49152 without ... L1C64 ; Page in logical RAM bank 5 (physical RAM bank 0).
    DI
    Default bank 0 (logical 5) $C000 to $FFFF will be ... Stack SP set to below $C000 to avoid any issues ...
    dbolli dbolli August 2015 Emulators
  • fao Winston, Flash romssince you are an expert on flash roms :) do you know how a spectrum +3 can be modified to use flash chips from old motherboard bios chips etc? the r…

    ... spectrum +3 can be modified to use flash chips from old ... presume one could add a switch to change bank and have different roms ... /> also would it be possible to flash the roms onboard the ...
    guesser guesser March 2008 Hardware
  • 'Ocean Draw' instructionsHere are the instructions for the screen and sprite editor used in-house at Ocean Software, possibly typed up by Joffa Smifff (as the 2 of the sprite…

    ... MENU *****

    M -CHANGE TO CHARACTER MODE

    1 ... MENU *************

    M -CHANGE TO SPRITE MODE

    1 ... -SWITCH TO ROM CHARACTERS

    4 -SWITCH TO USER CHARACTERS

    5 -VIEW ...
    Mark R. Jones Mark R. Jones September 2014 Sinclair Miscellaneous
  • Who want to remake Double Dragon?Seeing as the Speccy version was crap (see my review: [url="http://www.gamestyle.net/retro.php?article=31"]http://www.gamestyle.net/retro.php?article…

    ... days ago... they just switch memory banks directly in sprite ... switch to screen bank, get backround, and + or + put it to the screen then switch ... back and going to the next ... problems raised when i tried to manage so big sprites :( ...
    Fikee Fikee August 2003 Games
  • I've got a divIDE. Now what?I've purchased a divIDE and after a month it's at home. What can I do now with that? I've got a 48k+, a +2B and a +3. The +2B has the original ROMs,…

    ... plain divIDE would be upgraded to a divIDE+... am I right ... will be using a 3.5" PC drive as secondary drive ... , then making the double side switch and at last (but not ... important) making the swap drive switch (to use 3.5" drive as A:)
    Zup Zup September 2007 Hardware
  • fao Winston, Flash romssince you are an expert on flash roms :) do you know how a spectrum +3 can be modified to use flash chips from old motherboard bios chips etc? the r…

    ... spectrum +3 can be modified to use flash chips from old ... presume one could add a switch to change bank and have different roms ... /> also would it be possible to flash the roms onboard the ...
    piters piters March 2008 Hardware
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... ]There's no reason to limit yourself to 16K.[/QUOTE]

    to page RAM at most 2-4 times ... separate sprite in RAM 0, and then switch to RAM 7 to draw it.
    ajmoss ajmoss August 2010 Hardware
  • SpecBAS (SpecOS's BASIC interpreter) is updated - build 236Build 236 is up at [url]ftp://zxdunny.dyndns.org[/url] New for this release is the beginnings of a proper manual - all commands and functions docume…

    ... prog into a bank, how then can I switch to that bank to run it ... ?...

    eg: After LOAD "progs/stars" BANK ... 2... how would I then be able to run it ... banks that are moved first to bank 0 or something and have ...
    kgmcneil kgmcneil September 2010 Sinclair Miscellaneous
  • SpecBAS (SpecOS's BASIC interpreter) is updated - build 236Build 236 is up at [url]ftp://zxdunny.dyndns.org[/url] New for this release is the beginnings of a proper manual - all commands and functions docume…

    ... into a bank, how then can I switch to that bank to run it ... ?...

    eg: After LOAD "progs/stars" BANK ... 2... how would I then be able to run ...
    LOAD filename$ BANK n
    RUN [BANK n] filename$ [ASYNC]
    Dunny Dunny September 2010 Sinclair Miscellaneous
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... loading 128kB snapshots from DIVIDE to TKMEM 128:[/B][/U]
    to ram page 5 at adress 49152. ZX ...
    velesoft velesoft January 2013 Hardware
  • RAM paging and port usageDear users and developers, I'm just trying to find some detail information about RAM paging on the Spectrum 128 and later models, especially those a…

    ... at C000..FFFF.
    page 5 is always paged at 4000 ... (RAM 0..RAM 7) is paged at address C000..FFFF, page 5 is ... 7ffd are also used to select the RAM bank for paging at address ... /> Is it just a 5-bit integer with bits 7 ... an additional bit. bits 5,6 and 7 are now ...
    clausjahn clausjahn June 2008 Hardware
  • LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…

    ... detailed timings of contended RAM. It gives timings ... in, or reading/writing, contended RAM.

    I ... 2
    de:1 x 5[/quote]

    ... RAM bank 7 into a 128K machine) involves blitting close to ...
    I almost forgot to ask: What precisely does "[ ...
    ajmoss ajmoss June 2010 Development
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... on the Spectrum's ability to switch screen buffers in hardware ( ... (with only one 16K bank pageable) and the contention ... and on its place the RAM is connected.

    A=5 for RAM 4,5,6,3
    ... A low will also function to switch off the +3 motor ...
    ajmoss ajmoss August 2010 Hardware
<1234567…34>

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