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<1234567…34>
  • Toastrack/Grey +2 physical memory layoutI'm looking to extend the functionality of the test ROM used with Winston's diagnostic board to also properly test the RAM of toastrack and grey 128K…

    ... the RAM of toastrack and grey 128K machines.

    As ... No indication of what's contended and what isn't, or ... what corresponds to contended/uncontended memory.

    ... to IC's (e.g. bank 0, bit 0 to IC15 ... , bank 0, bit 1 to IC16 ...
    balford balford February 2014 Hardware
  • 128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…

    ... contention issues of the various 128K/+2/+2A/+3 spectrum ... 128K/+2 models, banks 1,3,5 and 7 are contended ... 5,6 and 7 are contended. I can see why ... are contended as they relate to the screen. I understand that bank ... machine is 128K/+2 and if so load into bank 4 ...
    adrian_singh adrian_singh May 2017 Development
  • Games not compatible with real grey +2There are many threads about Spectrum+3/2A incompatibility issues but what about grey +2? I've found that games like Marauder and Skate Crazy don't w…

    ... />
    On the 128K/+2, there are contended memory pages that can ... get games in 128K mode where a contended bank is paged in and ... causes a crash on the original 128K ... and and grey +2 models.

    Jmk Jmk January 2010 Games
  • Games not compatible with real grey +2There are many threads about Spectrum+3/2A incompatibility issues but what about grey +2? I've found that games like Marauder and Skate Crazy don't w…

    ... />
    On the 128K/+2, there are contended memory pages that can ... get games in 128K mode where a contended bank is paged in and ... causes a crash on the original 128K ... and and grey +2 models.
    [/ ...
    Alcoholics Anonymous Alcoholics Anonymous January 2010 Games
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... .

    The +2 grey has two physical memory banks ... the Spectrum 128K has... this is another "kind" of bank), composed ... Spectrum without any of its 128K features, the memory map ... border : a chip in the contended bank is damaged. Further analysis is ...
    mcleod_ideafix mcleod_ideafix October 2010 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…

    ... is used to define RAM bank (n=0..7) or ROM ... bank (n=0..1).
    If ... to assemble to a particular 128k ram bank? I only need to ... use one bank, so
    which is the ...
    MatGubbins MatGubbins August 2015 Emulators
  • Spectrum 128k +2 issue 2I am wanting a Grey 128k +2 issue 2 machine. Preferably working but doesn't matter too much if not as long as it is complete. Thanks

    I am wanting a Grey 128k +2 issue 2 machine. Preferably working but doesn't matter too much if not as long as it is complete.

    Thanks
    BruceNorton BruceNorton May 2016 Wanted
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... this from the Zx Spectrum 128k Technical service manual
    I ... /> because according to them the Contended bank is IC's 6-13 ... just striped within a particular bank (that would make sense I ...
    ZXZaber ZXZaber October 2010 Hardware
  • JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…

    ... =zx81;629087]The new "emulation 128k crashes" is problematic. Some programs ... and works on a real 128k anyway. An example is "Phantomas ... is a contended bank. So if it's not a contended bank you wouldn ...
    chev chev May 2012 Emulators
  • JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…

    ... is a contended bank. So if it's not a contended bank you wouldn ... & contended page, but don't resets on a real 128k.
    zx81 zx81 May 2012 Emulators
  • CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…

    But Cyberbig works really on 128k/+2 models?.

    A ... >= 0xC0 and the bank paged is a contended bank. The [URL="http ... result when the bank paged is changed to a contended page and ... the ULA accesing to a contended bank at the same time?. The ...
    zx81 zx81 April 2013 Games
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... and 128K banks 1,3,5 and 7 are all contended. Expect ... or executing code in a contended bank, your execution time will vary ... /> IO port $fe is also contended, but I'll leave that ...
    GoingDigital GoingDigital September 2013 Development
  • harvard architecture spectrum clone.I got my first +2 before christmas. I'd never given the 128k spectrums much thought, always been a 48k rubber key tradionalist. :smile: I've been me…

    ... computers, I think the bank switching (or paging) could ... possible banks of 8k from 128k

    0xA000 ... possible banks of 8k from 128k

    0xC000 ... 128k.
    RAM banks 0 to 7 are not contended ... 8 to F are contended.

    Bank Register 0
    1024MAK 1024MAK January 2014 Hardware
  • How did bank switching work on the 128K Spectrums?I'm new to Z80 and ZX Spectrum. So I was wondering how the 128+ models managed to work with more than 64K of memory? I'm somewhat familiar with h…

    ... in comparison to the other 128k models so aiming for max ... in that different 128k models have different pages contended. On the spectrum ... have to be aware what 128k model you are running on ... register is pointing into a contended bank). This flaw will not be ...
    Alcoholics Anonymous Alcoholics Anonymous October 2015 Hardware
  • 128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…

    ... major selling points of going 128k in the first place.[/ ... [quote]Since audio on the 128k doesn't need busy looping ... the +2 and +3, the contended bank distribution is different again, so ... with Interrupt handling on the 128K and further models deserves another ...
    Timmy Timmy May 2017 Development
  • 128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…

    ... then ended up with different contended pages, apparently due to incorrect ... "][quote]Since audio on the 128k doesn't need busy looping ... 6 as they aren't contended) along with all the needed ... the +2 and +3, the contended bank distribution is different again, so ...
    Sol_HSA Sol_HSA May 2017 Development
  • 128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…

    ... ....

    For 128K spectrum:
    bank 1 BC counter is ...
    For +3 spectrum:
    bank 1 BC counter is 11 ... instructions in the uncontended bank than the contended one in the course ... which is uncontended on the 128K/+2[/quote]
    should ...
    adrian_singh adrian_singh June 2017 Development
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... code is executing in a contended bank, the machine can crash. The ... contended on the +3. On regular 128k machines, only odd banks are contended ... you're targetting the original 128k, the only uncontended banks available ...
    Alcoholics Anonymous Alcoholics Anonymous February 2018 Brand new software
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... the "I" register points into contended memory, snow will appear on ... code is executing in a contended bank, the machine can crash. The ... been able to make the 128K machine crash when I set ...
    Ast_A_Moore Ast_A_Moore February 2018 Brand new software
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... the "I" register points into contended memory, snow will appear on ... code is executing in a contended bank, the machine can crash. The ... been able to make the 128K machine crash when I set ...
    cgonzalez cgonzalez February 2018 Brand new software
  • Gandalf [z88dk][Nirvana Plus][128Kb]Gandalf 1.00 [url="https://drive.google.com/open?id=1T9HK0_isoMrfogSIJVhPGehjVIdFus4c"]Download Ver 1.00[/url] Long after the destruction of t…

    ... the "I" register points into contended memory, snow will appear on ... code is executing in a contended bank, the machine can crash. The ... been able to make the 128K machine crash when I set ...
    Ast_A_Moore Ast_A_Moore February 2018 Brand new software
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... he says crashes a real 128k/+2 all the time:< ... even requires being in a contended bank in the top 16k.
    128k/+2 but crashes on a ... banks 4 & 6 are contended on the +3.
    ... between the +3 and regular 128k. So it also needs ...
    Alcoholics Anonymous Alcoholics Anonymous February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... he says crashes a real 128k/+2 all the time.[/ ... when it comes to a 128K/+2. See, on these ... a 128K/+2 there’s another factor at play—which bank ... applies; if it’s a contended bank, then the snow effect ... to $f7, because the 128K machine will switch between banks ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... play it). Loading the original 128K version on a Toast Rack ... in the custom loader is Bank 1 (contended, naturally) and I is ... effect remains, then a non-contended bank is switched in and the ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…

    [quote="utz;943985"]a) make sure port hi-byte is not within #40-#7f and #c0-#ff[/quote]
    The latter range is irrelevant on the 48K. It’s only necessary to keep out of that range if you’re on a 128K and a contended bank is paged in.
    Ast_A_Moore Ast_A_Moore July 2018 Assembler
  • Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…

    On ZX48 or 128/+2(grey) is contended and uncontended ports.
    For ... , half of all ports will contended (slow down by ULA). ULA ... A14=1, ports is slow (contended)
    If A15=1 and ... is set, ports is slow (contended)

    Example of slow ...
    velesoft velesoft October 2007 Hardware
  • Unable to load tapesHello, Can anyone help me,I have a grey 128k,When I connect everything up to my TV,I get a loading screen,but when I go to load a tape,nothing happen…

    ... help me,I have a grey 128k,When I connect everything up ...
    Dazza75 Dazza75 March 2012 Sinclair Miscellaneous
  • ZX Spectrum 48K yellow displayI have a ZX Spectrum which displays a yellow- instead of grey screen on startup. All colours seem mixed with yellow. Everything else seems fine, some…

    ... displays a yellow- instead of grey screen on startup.
    All ... were tested before on a grey 128K, so some might have issues ...
    Knik Knik March 2013 Hardware
  • ZX meets Atmos[URL="http://www.ebay.co.uk/itm/SINCLAIR-ZX-SPECTRUM-2-GREY-128K-CUSTOM/171109564816?_trksid=p2047675.m1850&_trkparms=aid%3D333005%26algo%3DRIC.FIT%2…

    ... /itm/SINCLAIR-ZX-SPECTRUM-2-GREY-128K-CUSTOM/171109564816?_trksid=p2047675.m1850 ...
    Macc Macc August 2013 Hardware
  • New version emulator ZEsarUX 3.1Hi I have uploaded a new version of my emulator ZEsarUX on http://sourceforge.net/projects/zesarux I have improved accessibility support, no…

    ...

    Added Pokeing to 128k machine (bank, address, value)

    chernandezba chernandezba October 2015 Emulators
<1234567…34>

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HitBox

Word Docs Hits
grey 15.4K 16.9K
128k 16.7K 25K
contended 1.2K 2K
bank 3.6K 5.8K

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