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  • IM2 on a 128k SpectrumHello: I have found another article on IM2 found in Personal Computer News, Issue 90. In the article "Face up to the Time", I typed up the code (…

    ... put the interrupt vector in contended memory ($4000..7FFF or banks 1 ... puts the interrupt vector there. Contended banks are different on +2A ...
    colonel32 colonel32 August 2020 Development
  • New Version of MAME Emulator out with enhancements on Spectrum-EmulationNew Version 0.216 of MAME Emulator out with enhancements on Spectrum Emulation: [url="https://www.mamedev.org/?p=476"]https://mamedev.org/?p=476[/…

    ... this month, allowing more accurate memory access timings for the ZX ... ]

    -Spectrum +2/+3 contended memory is different to Spectrum 128k ...
    Luzie Luzie May 2022 Emulators
  • XYZ - a multithreaded GUI operating system for SpeccyToday I'm re-starting my unfinished project. A few years ago I wrote the yx multitasking kernel (which includes RAM/ROM versions, threads, memory man…

    ... some machines all timings (including contended memory timings) are one T ... is set to point to contended memory still occurs, and also ... is set to point to contended memory.

    https://worldofspectrum ... has to be in non contended memory as well to be ...
    Paradigm Shifter Paradigm Shifter July 2022 Development
  • +2 grey Contended RAMhi all, i have some quenstions about, contended RAM are banks 1,3,5,7 banks are the pairs of IC's (4164), so 1 pairs = 16k X 4 pairs = 64k this 64…

    ... some quenstions about,

    contended RAM are banks 1,3 ... the main memory, and then we have uncontended memory "upper" memory with the ... same logic

    now psysical, contended ...
    xaris_sm xaris_sm March 2013 Hardware
  • 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…

    ... clear to me how the memory is physically laid out.
    Contended IC6 to IC13 (Banks 1 ... 't, or what corresponds to contended/uncontended memory.

    Could anyone ...
    balford balford February 2014 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…

    ... br />
    The 64k memory space is divided in four ... no way to page in memory there. Second chunk is ... Third is fixed to usable memory. Fourth is the bankable ... be in the always-resident memory (the fixed 16k + the ... 6 as they aren't contended) along with all the ...
    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…

    ... get my head around the memory contention issues of the ... best use of the extra memory. I've searched the ... I can understand that the memory is divided up into banks ... 3,5 and 7 are contended and that for models + ... 5 & 7 are contended as they relate to the ...
    adrian_singh adrian_singh May 2017 Development
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... the memory at this T-state and hence will be contended, so ... try to run [URL="http://zxds.raxoft.cz/taps/misc/progforhackers ... accessing the memory before that. So at least 3 contended T-states ... byte is being fetched during contended IO.

    Thus the ...
    csmith csmith September 2007 Emulators
  • Memory usageBrowsing the online documentation for the Spectrum I came across a peculiar discrepency. As we all know the start of the RAM is at 16384 which is whe…

    ... is where the screen memory resides. The screen memory ends at 23296 ... is what on earth the memory before KSTATE and after the ... video memory is used for on a ...
    cyborg cyborg November 2002 Sinclair Miscellaneous
  • 128 Memory PagingI'm having a problem getting my brain around paging. Well, actually the bit I don't understand is how reading I/O ports works! I hope the collective …

    ... />
    Port 32765 controls the memory paging. Bits 0-2 determine ...
    trellis trellis August 2003 Sinclair Basic
  • ZX80/81 memory expansion and 48k + Lightpen for saleAll are in original packaging and the lightpen has it's software and manual. The memory expansion is a 16k one. E-mail me at [email="patrick@wych01…

    All are in original packaging and the lightpen has it's software and manual.

    The memory expansion is a 16k one.

    E-mail me at [email="patrick@wych01.freeserve.co.uk"]patrick@wych01.freeserve.co.uk[/email] if intrested..
    zeropolis79 zeropolis79 September 2003 Sales
  • memory is filled up under Win XP when opening many filesDear friends, I have the big and strange problem that ZX-Rainbow's game scanner is not working properly under Windows XP. I figured out (during a ti…

    ... in the virtual memory), so that the memory is filled up with ... the file stream, freeing the memory.
    I wrote another testing ... the complete file content in memory.

    The problem does ...
    Seejay Seejay April 2004 Development
  • Memory Available for 16k and 48kAm I right in thinking that if I am writing a 16k Game, I have 8k available for the machine code prog 6000h to 8000h, and for a 48k game I have 40K a…

    ... /> If so, what are the memory areas available for 16k and ...
    robpearmain robpearmain May 2004 Development
  • Strange layout of Spectrum video memoryHello, does anyone have an idea why the Spectrum's video memory has such a strange layout? I understand that a resolution of 256x192 is an easy mean…

    ... why the Spectrum's video memory has such a strange layout ... it easier to address video memory. I also understand that the ... ) are a compromise to limited memory. But where does the line ...
    J?rg Pleumann J?rg Pleumann August 2004 Sinclair Miscellaneous
  • what extra port for extra memory ? (256K, 512K, 1024K, etc.)I know that Pentagon uses some extra bits from port 7FFD for extra memory pging: - for 512K model, bit 6 & 7 of port 7FFD - for 1024K model, bit 5, 6…

    ... from port 7FFD for extra memory pging:
    - for ... those bits for extra memory switching and if it ... / port DFFD for extra memory paging.
    What is ... keep track of a memory bank number, by combining ... established port for extra memory, other than the Pentagon ...
    secarica secarica September 2004 Sinclair Miscellaneous
  • SPIN - debugger / fill memory / how ?I try to fill the screen with 00 value, but I don't get the expected result. - pause the game - debugger - hex numbers - fill memory block - fill wi…

    ...
    - hex numbers
    - fill memory block
    - fill with 00 ...
    - main memory
    - start address - 4000
    - ok
    then
    - view memory
    - all screen data is ...
    secarica secarica October 2004 Emulators
  • Data at the top of memoryWhilst viewing memory locations on the "Spin" emulator I noticed data starting at 65336. Does a "real" ZX Spectrum 48k use the top end of available m…

    Whilst viewing memory locations on the "Spin" emulator I noticed data starting at 65336. Does a "real" ZX Spectrum 48k use the top end of available memory ? If so, what is the last memory location that is safe to use ?
    Mr Millside Mr Millside February 2005 Development
  • Emulator Dev: Memory Use When Loading RZXsHi, I am currently working on a port of an emulator to a system with limited memory (64mb). I am running out of memory when loading large snapshots …

    ... to a system with limited memory (64mb). I am running out ... of memory when loading large snapshots (ie ... let me know how much memory is needed to decompress a ...
    Crabfists Crabfists June 2005 Emulators
  • Interface 1 Memory Map(I'm not sure which section this post should go in, but here seems as good as any) Since the Interface 1 ROM is only 8k long, does anyone know what …

    ... appears in the 8-16k memory range when IF1 is paged ...
    MikeW MikeW May 2006 Hardware
  • Wanted: Gamecube memory cardI'm looking to buy a gamecube memory card. I don't need a large capacity memory card but a card that can save information for upto 3 games will do. I…

    ... looking to buy a gamecube memory card. I don't need ... a large capacity memory card but a card that ... they own or a used memory card (in working condition of ...
    Arjun Arjun May 2006 Chit chat
  • R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …

    ... . What is the effect of contended RAM on the R-register ... not run any code in contended RAM, but I do make ... thing, but then without the contended RAM the HALT would take ...
    icabod icabod July 2006 Development
  • The Rocky Horror Show - Alternate version or just weak memory?Ok, I have a question that has been bugging me all my life... "The Rocky Horror Show" was the first game I have ever played, it was for some reason…

    ... a case of blurry child memory?

    And by the ...
    Fred_PJ Fred_PJ August 2006 Games
  • Emulator with ability to watch memory?Hi! I'm looking for an emulator that can give me a realtime update of an address in memory. I've tried Fuse (on OS X) where I can set a breakpoint i…

    ... update of an address in memory. I've tried Fuse (on ...
    bigredswitch bigredswitch August 2006 Emulators
  • Where do you keep your tape images? CD, DVD, USB drive or Memory Sticks?I have my most beloved games (well over 300 titles) on my SD memory card. What's your type of archive medium?

    I have my most beloved games (well over 300 titles) on my SD memory card. What's your type of archive medium?
    Uros Zupan Uros Zupan September 2006 Sinclair Miscellaneous
  • ZX Spectrum +3 - incompatible ?Hello :) I'm newbie here. I know WOS site since years, never checked forum before ;) , but this moment came when I have problem. I wanna buy ZX Spe…

    ... /> * Memory timing changes; some of the RAM banks were now contended causing ...
    dax dax September 2006 Hardware
  • Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…

    ... ?) behind ULA's spectrum screen memory interpretation?

    6144 bytes ... behind this implementation? Why screen memory isn't interpreted continuously?
    Arda Arda October 2006 Development
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Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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contended 1.2K 2K
memory 21.8K 32.5K
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