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<1234567…34>
  • 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 …

    ... problem getting my brain around paging. Well, actually the bit I ... />
    Port 32765 controls the memory paging. Bits 0-2 determine the ...
    trellis trellis August 2003 Sinclair Basic
  • 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…

    ... /> twice the amount of memory than can comfortably fit. While ...
    paging - BASIC (and the processor) always 'sees' the memory as 16K ... to "disconnect" the ROM memory completely and to write to ... lowest 16 KB of memory with proper paging?
    I always ...
    Ralf Ralf March 2008 Development
  • Loading data from 128 memoryAfter all these years I have come across the LOAD! in 128 basic for storing/restoring data in the 128 memory. How do I go about implementing this in…

    After all these years I have come across the LOAD! in 128 basic for storing/restoring data in the 128 memory.

    How do I go about implementing this in machine code?

    Thanks in advance...
    daveysludge daveysludge March 2014 Development
  • How would I turn memory paging on/off in Assembler?Sorry for the noob question. It's perfectly ok to do OUT 32765,48 in BASIC to turn memory paging off. But how do you do it in assembly language? I kn…

    ... OUT 32765,48 in BASIC to turn memory paging off. But how do ...
    ivanb303 ivanb303 January 2018 Development
  • 128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…

    ... )?

    [code]
    ; 128 rom paging routine
    ; use rst 28h ...

    ;;rom0

    paging
    org 0x0028
    ld ...
    chev chev August 2008 Development
  • 128kB software with incorrect memory pagingI search all ZX software using incorrect memory paging via OUT (253),A. This software must write to port data value with D6=1 for compatibility with …

    ... all ZX software using incorrect memory paging via OUT (253),A. This ... use on this computers different memory pages.
    velesoft velesoft March 2010 Games
  • Real Spectrum screen flicker with SCREEN$I've written a basic loader to simply do a 'load "" screen$' based video from a divide+ however I'm finding the Spectrum can't render a screens and a…

    ... want to try something in 128 mode, give this a go ... mode (enter 'usr 0' from 128 basic which will crash the machine ... 48k mode from which the 128 memory paging is still available):

    Alcoholics Anonymous Alcoholics Anonymous March 2010 Development
  • Real Spectrum screen flicker with SCREEN$I've written a basic loader to simply do a 'load "" screen$' based video from a divide+ however I'm finding the Spectrum can't render a screens and a…

    ... want to try something in 128 mode, give this a go ... mode (enter 'usr 0' from 128 basic which will crash the machine ... 48k mode from which the 128 memory paging is still available)
    [/QUOTE ...
    brownb2 brownb2 March 2010 Development
  • ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…

    ... with the NMI browser - (using 128 toast rack and grey +2 ... loaded from basic, they seem to mess with the 128 memory paging.
    tornado ...
    madvanman madvanman September 2012 Announcements
  • 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 512K ... (not to mention the Basic command SPECTRUM on +128/+2, that also ... 3 / port DFFD for extra memory paging.
    What is ZX PROFI ... any established port for extra memory, other than the Pentagon road ...
    secarica secarica September 2004 Sinclair Miscellaneous
  • ROM paging questionAssuming the Spectrum 128 memory map and port addresses, but two custom ROMs in place of the normal Editor and BASIC, what is the most efficient way …

    Assuming the Spectrum 128 memory map and port addresses, but ... of the normal Editor and BASIC, what is the most efficient ... ROM-1, which means the paging code needs to skip those ... /> The RAM part of the paging routine should live at 23296 ...
    chev chev January 2006 Development
  • Memory and BasicQuestions 1. How much memory is available for Basic Progs? 2. How do I check how much is left? 3. How much memory does an array take up?

    Questions

    1. How much memory is available for Basic Progs?
    2. How do I check how much is left?
    3. How much memory does an array take up?
    chop983 chop983 November 2008 Sinclair Basic
  • Midi Out from machine codeI need to send midi-signals by machine code, while Basic is too slow for my current project. I already read I can use hookcode #11E, but I have some …

    ... COLOR="Green"]On the 128 and +2, memory is entirely controlled by ... this does not affect the memory between 0x4000 and 0x7fff, which ... contains 48K BASIC.

    Bit 5:If set, memory paging will be ... :

    Bit 0: Paging mode. 0=normal, 1=special ...
    bverstee bverstee April 2010 Hardware
  • Problem with se basicI use MB02 memory paging (ram 16kB instead 48rom) and via one OUT 23,xx can switch between original 48 rom and SE ROM. But if I write basic program i…

    I use MB02 memory paging (ram 16kB instead 48rom) and via one OUT 23,xx can switch between original 48 rom and SE ROM. But if I write basic program in 48 basic and switch to SE BASIC then show basic incorrect. Why ?
    velesoft velesoft December 2010 Sinclair Basic
  • Enable 128kB paging in emulatorFrom Zx Spectrum documentation ([url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url]) [CODE][SIZE="1"]When memory is being pag…

    ...
    [CODE][SIZE="1"]When memory is being paged, interrupts should ... this does not affect the memory between 0x4000 and 0x7fff, ... 48K BASIC.

    [COLOR="Red"]Bit 5: If set, memory paging ... a .z80 snapshot where paging was disabled before saving and ...
    Ralf Ralf June 2013 Emulators
  • Hardware description - BETA DISK interfaceExist more versions and clones of BETA DISK interface. Beta disk 48, beta disk 128, brasilian clones of beta disk 48, russian clones of beta disk 128…

    ... description of most popular BETADISK 128:

    [COLOR=" ... /> [U][B]Description of Betadisk 128[/B][/U]

    ... type and always enable betadisk memory paging mechanism. Then after reset ... 66 external rom memory.
    - From ZX basic can be external ...
    velesoft velesoft August 2013 Hardware
  • The history of ESXDOS, the DivMMC and the DivMMC EnJOY![img]http://benophetinternet.nl/hobby/divmmc_history/1%20esxdos.jpg[/img] These are the stories behind esxDOS, the most popular operating system e…

    ... /> Full TR-DOS support from BASIC

    -------------------
    ... - swap partition
    - virtual memory up to 4Mb

    128 Speccy cores for it (the ... other ports.
    The memory paging port is compatible with ...
    bverstee bverstee October 2015 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…

    ... my head around the memory contention issues of the ... use of the extra memory. I've searched the ... I can understand that the memory is divided up into ... When going into either 128/+2/+3 Basic and using a ... ?

    The 128 ZK Spectrum reference FAQ says ...
    adrian_singh adrian_singh May 2017 Development
  • 128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…

    ... br />
    On the 128 and +2, memory is entirely controlled by ... 1 contains 48k BASIC.
    Bit 5 If set, memory paging will be ... editor scratchpads.

    Memory banks 4-7 are contended ... typical bank switch on the 128 is:
    LD A,( ...
    Fikee Fikee February 2006 Development
  • Paging MemoryAny idea why this short piece of code doesnt work, just crashes. I am just messing with paging memory in and out (not achived this yet) and reading t…

    ... since you're returning to basic you have to be careful ... to 128 page port(FF or attribut value). If you disable memory paging ... (OUT 32765,48 ), 128 port reading / writing ...
    velesoft velesoft October 2007 Development
  • New Spectrum game - Isotopia by OctocomOctocom, the guys who made BASIC programmed games such as Pandemia or Insert Coins, released yesterday their very first compiled BASIC game: Isotopia…

    ... there separate versions for the 128 & +2, and the +2A ... memory-paging & contention timing differences, but I'm doubting a compiled basic ...
    bobs bobs December 2007 Games
  • New Spectrum game - Isotopia by OctocomOctocom, the guys who made BASIC programmed games such as Pandemia or Insert Coins, released yesterday their very first compiled BASIC game: Isotopia…

    ... there separate versions for the 128 & +2, and the + ... memory-paging & contention timing differences, but I'm doubting a compiled basic ... theses?[/QUOTE]

    The BASIC commands to access the RAM ... use different syntax. In the 128/+2 you do it with ...
    na_th_an na_th_an December 2007 Games
  • Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…

    ... memory(basic) and set 48 rom with enable 128kB memory paging. For switch from 128 basic ... to 48 basic you can ... disable 128kB memory and will available only 48kB memory without paging.

    velesoft velesoft December 2008 Sinclair Miscellaneous
  • Usr 0 ?I'm not sure I've ever seen this explained before, but why do some programs (only demos, as far as I can see, so far) need USR 0 mode when run on a 1…

    ... 128 BASIC, it goes into 48k mode but with all the 128k memory ... memory(basic) and set 48 rom with enable 128kB memory paging. For switch from 128 basic ... to 48 basic you can ...
    ewgf ewgf December 2008 Sinclair Miscellaneous
  • Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…

    ... change TAP files only from basic, not exist comfortable NMI ... 128 editor(rom 0). As first you must copy memory ... routines for write commands in 128 basic.
    [img]http://velesoft ... true allram mode with 16kB memory paging with selectable write protect !!! ...
    velesoft velesoft January 2009 Hardware
  • Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…

    ... Far from being limited to BASIC, ResiDOS makes all of ... />

    [QUOTE]128 BASIC is overrated. ResiDOS provides emulation ... extra commands without requiring the 128 editor ROM.[/QUOTE]
    ... DIVIDE ide ports + MB02 memory paging(or any other with ...
    velesoft velesoft January 2009 Hardware
  • 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…

    ... =velesoft;367559]Garry: Use RESIDOS memory paging often ? Is possible write RESIDOS ... RST adress is OUT 227,128 = connect 8kB DivIDE eeprom with ... /> [*]ResiDOS bank (1) active.
    [*]BASIC bank (0) switched back in ...
    glancaster glancaster July 2009 Hardware
  • 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…

    ... mode (because they call the memory paging ports). There are an even ... games which require the original BASIC ROM (e.g. Travel With ... are the original BASIC ROM and the UK 128 editor (patched to ... work with the original BASIC ROM).
    chev chev January 2010 Games
  • 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…

    ... did for Jet Set Willy 128: Any code intended for banks ... A,(5B5Ch) ; restore the memory paging that BASIC expects
    LD BC,7FFDh ... DOS READ with the correct memory bank set up.
    John Elliott John Elliott January 2010 Emulators
<1234567…34>

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128 9.4K 14.8K
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Related Threads

  • 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 …
  • Memory paging in 128 KB - 64KB RAM possible?I have found a quote in Spectrum 3 manual (available at WOS)<br /> <br /> --------------------<br /> In the +3, we have crammed in more than<br /> tw…
  • 128 BASIC-compatible way of loading BASIC as code?On a 48K Speccy (or from 48 BASIC or USR 0 mode on a 128K machine), one can do a silly trick like this:<br /> <br /> [code];; load a 4000 byte BASIC …
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