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<1234567…34>
  • 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…

    ... find some detail information about RAM paging on the Spectrum 128 ... TS2068
    No RAM paging, but always fixed 48k RAM starting at address ... /> In addition to the paging methods of the Spectrum 128k ... used to select the RAM bank for paging at address C000..FFFF ...
    clausjahn clausjahn June 2008 Hardware
  • RAM PagingCan anyone shed some light as to how RAM paging actually works, at a hardware level (so not POKE xxxxx stuff). I know about CE and OE lines on DRAMs …

    ... some light as to how RAM paging actually works, at a hardware ... is employed to trigger the paging?
    Womble Womble December 2009 Hardware
  • Tough paging questionOK... Take this: 1. We have a program compiled and run from within GENS under a Pentagon 128K environment. 2. The program works perfectly. 3. We sav…

    ... glitches, especially in matters of paging.
    6. The generated code ... /> I thought the paging system for the RAM on the +3 should ... anything different in matters of RAM paging.

    And, Cyborg, yes ...
    GOC GOC November 2003 Development
  • 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…

    ... to be used to page RAM, which from BASIC would be ...
    Battle Bunny Battle Bunny August 2011 Sinclair Basic
  • +2 Gray ProblemI'm trying to repair a +2 gray that behaves differently at every boot up. Some rare times I can get the selection window but pretty soon the characte…

    ... containing Paul Farrow's 128k ram testing program. New Z80 tested ... Data Line 5[/b]" at RAM Bank 0 and 2 and also ... -FFFF.
    Also the message "RAM Paging Works Correctly" at the bottom ... must be on the contended RAM part since its causing visual ...
    gtsamour gtsamour May 2016 Hardware
  • 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…

    ... the 3DOS ROM routines and RAM paging to load the snapshot from ... initially just used the standard RAM pages but noticed some games ... to swap in another ROM (bank 4->ROM). This improved ...
    TomD TomD May 2019 Development
  • Questions from the new owner of a grey Spectrum +2I managed to pick up a grey Spectrum +2 off of ebay with cheap shipping (I'm in the US... it was $13 total and it has a Donkey Kong tape inside) and …

    ... additional circuit for the added bank switching that the newer ULA ... IDE interface and extra onboard RAM, which can run the ZXVGS ... ) is aliased to the 128K RAM paging port (7ffd) so some modification ...
    glancaster glancaster September 2006 Hardware
  • RAM PagingCan anyone shed some light as to how RAM paging actually works, at a hardware level (so not POKE xxxxx stuff). I know about CE and OE lines on DRAMs …

    ... some light as to how RAM paging actually works, at a hardware ... is employed to trigger the paging?[/QUOTE]

    Simple: ... br />
    Essentially, the basic paging circuit comprises of the following ... connector as well as a bank of LEDs.

    [ ...
    Winston Winston December 2009 Hardware
  • Converting games from tap to dskHi to all from Greece, Being an old Speccy user and now owner of most models of Spectrum (48k , 48k+ , 128K, +2 grey and +3) , I desided to salvage m…

    ... roms - Interrupts are enabled while ram paging is happening - so every 1 ... at the bank value at 23388 and sets the ram page - so ... probably setting ram page back to 16 halfway through the bank move ...
    nuggetreggae nuggetreggae January 2010 Emulators
  • 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…

    ... is to use the video RAM paging hardware.

    ... is to page RAM 5 and RAM 7, writing both ... entire program into 16K, in RAM bank 2.

    ... music tracker data, in RAM bank 0. As long as ... RAM 7 can be written from RAM 2, and video-RAM 5 from RAM ...
    ajmoss ajmoss August 2010 Hardware
  • 80x24 mode (Timex required)Hopefully Martijn will be adding this to the archive soon, but until then grab it here: [url]https://dl.dropbox.com/u/15659782/BASIC80.zip[/url] Th…

    ... ?[/QUOTE]

    The RAM being used to display the ... to draw the picture from bank 7 and it enables ... hi-res mode. Normally bank 0 is paged in at ... 0xc000. Bank 7 only needs to be ... to the memory map. The RAM paging is relevant to the CPU ...
    BloodBaz BloodBaz August 2012 Sinclair Basic
  • Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…

    ... that the extra 16K of RAM you get access to ... get 16K of uncontended RAM (in bank 3) for all your ... cache the resultant data into bank 3, then switch modes ... write that data out of bank 3 onto one of ... right places using the normal paging mode.

    If ...
    joefish joefish February 2013 New game ideas
  • 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…

    v1 is now ready, hopefully no bugs but let me know if you find any. You can download it from my website [url="http://tomdalby.com/speccy/Z80onDSK.zip"]tomdalby.com/speccy/Z80onDSK.zip[/url]

    [code]
    Z80onDSK v1.0 (c) 2019 Tom Dalby
    TomD TomD May 2019 Development
  • If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…

    ... with banked ROMs and 128k RAM paging (minus bank 5 and the shadow ... and stuck to the 48kB RAM then you have the problem ... that +3DOS needs RAM for workspace, which eats into ... your limited RAM even further. The hardware for ...
    guesser guesser February 2021 Hardware
  • BASin Release 13 is now availableI'm still at it. BASin is now in it's 13th incarnation (disregarding the inter-version updates) and is now available at [url="http://homepage.ntlw…

    ... +2 manual that made the RAM Disk possible!)
    Added - ... .
    Added - 128k RAM page bank switching mechanisms for the RAMDisk ... 128k Errors were corrupting the RAM Disk when they triggered - SP ... reporting was very broken for RAM Disk errors.
    Fixed - ...
    Dunny Dunny January 2006 Emulators
  • BASin Release 13 is now available[unashamedly x-posted from Emulators forum] I'm still at it. BASin is now in it's 13th incarnation (disregarding the inter-version updates) and is …

    ... +2 manual that made the RAM Disk possible!)
    Added - ... .
    Added - 128k RAM page bank switching mechanisms for the RAMDisk ... 128k Errors were corrupting the RAM Disk when they triggered - SP ... reporting was very broken for RAM Disk errors.
    Fixed - ...
    Dunny Dunny January 2006 Sinclair Basic
  • SimCoupe 1.0 released[size=-2](for those of you that don't read CSS)[/size] SimCoupe, the SAM Coup? emulator, has been updated to version 1.0. This major release adds ma…

    ... SAM mouse movements
    - Improved RAM, paging, CLUT and CPU register power ...
    obo obo July 2006 Emulators
  • Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …

    ... 128kB,512kB or 1MB ram
    + paging port #7FFD at ... 512kB / Pentagon 1024kB)
    + ram page 2 is mirrored to ... br /> [B]+ all external ram pages are fast (ULA no ... )[/B]

    - paging port #7FFD can't select ... is used.
    - ram page 5 is not mirrored ...
    velesoft velesoft March 2011 Hardware
  • DIVIDE PLUS - new memory mode DIVIDE128Divide PLUS contain 512kB sram + 512kB flash eprom. Memory paging in this device is enable on two different ports : 1) port #E3 is compatible with o…

    ... divide system.

    Divide ram paging bits on port #E3 (write ... similar paging mode, but can select up to 16 ram pages ... system.

    Divide ram paging bits on port #17 (write ... for this 128kB paging port very easy:
    - Paging port adress # ...
    velesoft velesoft June 2013 Hardware
  • +3DOS questionIn the documentation for the +3DOS functions 'DOS GET 1346' and 'DOS SET 1346' it's stated that the copy buffer can't be bigger than 4 sectors (i.e. …

    ... of some of the extended RAM paging schemes available on the +3 ...
    The_Bert The_Bert February 2014 Sinclair Miscellaneous
  • New Version of ZEsarUX v9.3 Beta 1 availableNew Version of ZEsarUX v9.3 Beta 1 available Downloads: [url="https://github.com/chernandezba/zesarux/releases/tag/9.3-25062021"]https://github.co…

    ... )
    Added Automatic Snapshots to RAM + Rewind feature
    Added new ... /> Added Jupiter Ace 51 KB RAM emulation
    Added GUI styles ... tbblue port 123b behaviour: 48kb ram paging, shadow display, 3bit offset, read ...
    Luzie Luzie June 2021 Emulators
  • ZEsarUX 10.0ZEsarUX 10.0 is out! Download it from : https://github.com/chernandezba/zesarux/releases/tag/10.0 Changes: Version 10.0 - Clive Sinclair edi…

    ... features: Automatic Snapshots to RAM + Rewind feature, backwards ... /> Added Automatic Snapshots to RAM + Rewind feature
    ... snapshot-inram-load: Loads the RAM snapshot from position
    ... port 123b behaviour: 48kb ram paging, shadow display, 3bit offset ...
    chernandezba chernandezba October 2021 Emulators
  • Spectrum helpHello all I run a website which is some sort of community/game information hybrid. It's dedicated to most gaming platforms (currently 62 of them). I…

    ... time linearly address that extra RAM. The 128k models page the ... top 16k of RAM and the bottom 16k of ... 's even have full 64k RAM paging modes.
    Apart from this ...
    cyborg cyborg November 2002 Games
  • Blizzard PassThis is one for testing an emulator since it works with not many. Theres a notice on the inlay. Select 128 basic then enter out 32765,23 then J"".

    That instruction locks the ram/rom bank configuration and is not implemented ... it but makes the top ram bank 7 which is contended so ...
    Fraser Fraser April 2003 Emulators
  • handbook for newbies ?looking at questions what regulary appears on this forum i have an idea. why not to write short book for newbies. if few experienced coders write eac…

    ... into AY, video rams, and ram paging, various other things you can ...
    Sadako Sadako April 2004 Development
  • 8 BIT WARSwhen 8bits ruled the home market Speccys, C64 and Amstrad were the big 3 fighting it out for supremecy.... but they didnt survive which as we know wa…

    ... , a much less haphazard ROM/RAM paging setup capable of addressing much ... CPC+ has had it's RAM cranked up and the floppy ...
    AndyC AndyC September 2004 Games
  • 8 BIT WARSwhen 8bits ruled the home market Speccys, C64 and Amstrad were the big 3 fighting it out for supremecy.... but they didnt survive which as we know wa…

    ... , a much less haphazard ROM/RAM paging setup capable of addressing much ...
    b00mzi11a b00mzi11a September 2004 Games
  • More RZX fun and gamesHi guys, as you may or may not be aware, xmikex and myself have been submitting recordings to Daren's archive for quite some time now. We still have …

    ... that it's the 128k RAM paging at fault there - we currently ... reload back to the wrong RAM pages, and therefore the keyboard ...
    Dunny Dunny March 2005 Games
  • Prince of Persia in an actual Spectrum?Prince of Persia is one the best games programmed for our Speccy in the last 10 years, but I think originally was written for TR Dos, although there …

    ... with $FF (causing some bad RAM paging)...

    I tried setting ...
    Jmk Jmk December 2006 Games
  • Prince of Persia in an actual Spectrum?Prince of Persia is one the best games programmed for our Speccy in the last 10 years, but I think originally was written for TR Dos, although there …

    ... with $FF (causing some bad RAM paging)...

    I tried setting ...
    Ivanzx Ivanzx December 2006 Games
<1234567…34>

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HitBox

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ram 12.6K 21.4K
paging 1.7K 2.4K
bank 3.6K 5.8K

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  • RAM paging and port usageDear users and developers,<br /> <br /> I'm just trying to find some detail information about RAM paging on the Spectrum 128 and later models, especi…
  • RAM PagingCan anyone shed some light as to how RAM paging actually works, at a hardware level (so not POKE xxxxx stuff). I know about CE and OE lines on DRAMs …
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