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Search Again :: Adv Search 1000 results in 0.034s
<1234567…34>
  • maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …

    ... RAM for a Z80 using bank switching?

    The ...
    A bank switching scheme allows the memory to be expanded to ... 16k sections. Any 16k page from the 4 MB ... four pages (2 to 5) are reserved for a ... by external devices and memory modules connected to the ...
    Rebelstar Rebelstar February 2013 Hardware
  • converting ZX128 software for SAM COUPESAM COUPE is computer compatible with ZX48 model. Use same ports, same keyboard with compatible membrane, 64kB adress space with possibility connect …

    ... extra bits for rom/vram switching. This is way for convert ... pages) to identical page in 1MB memory
    Page 5 must be on SAM ... rom to ram memory with write protect
    7) set ZX graphic ... br /> - is ignored switching to second ZX videoram, page 7 is used only ...
    velesoft velesoft April 2010 Games
  • 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…

    ... of memory?

    I'm somewhat familiar with how bank switching works ... had a weird way of switching banks...IIRC). Anyway, any insight ...
    cbmeeks cbmeeks October 2015 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…

    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
  • MultichromeIt turns out that multichrome, and other screen modes, are emulated in Fuse and Eightyone via ZX Spectrum SE emulation (which is similar to the TC214…

    ... videorams !!!

    Contents of memory page 5:
    49152-55295 = pixel area ... 1

    Contents of memory page 7:
    49152-55295 = pixel area ...
    velesoft velesoft January 2009 Development
  • 128k Paging a tile routine to a double bufferHi happy new year all :) Does anyone have an example of how to page a routine to the screen ie a tile routine? Thanks :)

    ... memory page 5 at 4000h is the source of the display file, or page 7 ... do, is draw to page 7 while displaying page 5, and then flip following ... , and start drawing to page 5 while displaying page 7.

    Hope that ...
    dmsmith dmsmith January 2016 Development
  • New project for 256 colours Games emulator!O.K. , I suggested Jonathan Needle ( Creator of the excellent Spectaculator at [url="http://www.Spectaculator.com"]www.Spectaculator.com[/url] ) to c…

    ... to understand what is RAM bank and 16K memory page...
    Vladimir Kladov Vladimir Kladov March 2004 Emulators
  • Cybernoid editorSo, my long tern goal is to make my own Cybernoid or Rex like game (see an ancient thread about Sprite advice)...but my skills are somewhat lacking..…

    ... was an offset reference from memory page 5, which starts at $4000.
    memory browser... it seems that FUSE ...
    48K 48K February 2007 Development
  • Compiling Basic to MCHello, I have a lot of long Basic programs. These are mostly strategy programs, good but slow. I was thinking about how to speed them up without com…

    ... step. First step is the memory lack. I can?t have ... /C at once in the memory of a Spectrum, even when ... 128 k Machines are just bank switching 16k Memory, so it might split ... PC based program without the memory restrictions.

    [QUOTE=na_th_an ...
    Speccyman Speccyman February 2011 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…

    ... does not require filling two memory pages with nonsense. Note ... contains the number of required memory page (0..7)
    ; A's ... the memory manager and then load individual page files into _virtual page ... over what goes into contended memory and what goes into ...
    introspec introspec June 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 various ... /> I can understand that the memory is divided up into banks ... start loading, Page 0 is paged in, so without any bank switching, that ... can see why banks 5 & 7 are contended as they relate ...
    adrian_singh adrian_singh May 2017 Development
  • What memory pages are being used in a +3DOS disk operation?To make a long story short: what pages are in use by +3DOS while doing read operations from the disk drive? Now, for the details, for those interest…

    ... , not a sector-by-sector copy.

    I began using ... to be loaded in "extended" memory. To avoid side effects, I ... (page 5). After all disk loads finished, I built the contents of page 7 ... use nearly all the available memory in all pages) succesfully? Do ...
    mcleod_ideafix mcleod_ideafix March 2011 Development
  • compatibility between ZX computers?Hey all, I'm new here :) I was wondering about compatibility between ZX computers. Is it possible to run a game made for ZX80 on a ZX Spectrum? Or a …

    ... space so you can page RAM 7 into the top of ... the screen as RAM 7 leaving the memory map as:
    < ... ROM
    RAM 5
    RAM 2
    RAM 7 - Screen
    bank 45912-65535 with other ... the screen only makes a copy in 45912-65535.
    ...
    Dr BEEP Dr BEEP July 2003 Sinclair Miscellaneous
  • Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…

    ... read files with +3DOS into memory.

    The +3 ... the RAM is 4,5,6,3 (as page 5, screen, variables, basic ... be in Bank 2 (according to the +3DOS memory config), but ... from +3DOS, page in 3/4/6, and copy it up ... when calling +3DOS, as 7 is paged in here, and ...
    rbsfou rbsfou July 2009 Development
  • Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…

    ... anywhere in page 5 or 2, not just limited to page 5.

    page and copy it into the upper RAM bank, and go ... routines from the upper bank (as ram page 7 is active then)....Gah ... while, but working around the bank switching seems to be hell on ...
    rbsfou rbsfou August 2009 Development
  • Elite +3This is a patched version of ELITE that saves commander data on +3 disks (and +3e hard disks) and of course loads them back. Commander names can only…

    ... 0 in 7 page of memory occurs the automatic machine at their switching. There ... order to load in page 6 a copy of the system variables ... loading/saving/error checking and bank switching and there is no other ...
    d_kef d_kef October 2009 Games
  • IF EXIST?In MS-DOS scripting, there is an IF EXIST command that lets you check wether a file exists in disk or not. There are any way to check it out from BA…

    ... is entered
    with the memory configured as illustrated below (left ... the top of
    memory is page 0 and the machine stack ... with RAM page 7 switched in at
    the top of memory, the ... at the bottom of
    memory (000h...3FFFh). This configuration is ...
    The_Bert The_Bert October 2013 Sinclair Basic
  • 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…

    ... decompress to each memory bank/page without the need ... 17) Copy page/bank 7 0xf700 1280bytes & 0xe800 1024bytes to page/bank 5
    ... /> -m: dump memory banks and full compression ... : @16384-32751 user specified memory location
    -fN: force ...
    TomD TomD May 2019 Development
  • Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…

    ... area at the start of page 7 in any way? (I ... the 128k editor, if page 7 is mapped in at c000h ... used for the stack from page 5. Does this not corrupt ... talking about the top-5k COPY corruption bug here)?
    ... info on the 128k memory model in particular would be ...
    rbsfou rbsfou January 2007 Development
  • 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 …

    ... 0-2: RAM page (0-7) to map into memory at 0C000h.
    bank 5, whilst the shadow screen is in bank 7. Note that ... this does not affect the memory between ... 0x4000 and 0x7fff, which is always bank 5.
    bverstee bverstee April 2010 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... different memory bank models, does not help either! (Is that velesoft page really ... talking about the 128?, bank bit B0 implies ... odd pages are contended, however banks 5-7 should ...
    csmith csmith July 2011 Hardware
  • 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…

    ... 0-2: RAM page (0-7) to map into memory at 0xc000.
    bank 5, whilst the shadow screen is in bank 7. Note that ... this does not affect the memory between ... 0x4000 and 0x7fff, which is always bank 5.
    Ralf Ralf June 2013 Emulators
  • 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.
    5,7)

    [B]+2:
    memory.

    Could anyone fill ... to IC's (e.g. bank 0, bit 0 to IC15 ... , bank 0, bit 1 to IC16 ...
    balford balford February 2014 Hardware
  • Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …

    ... works correctly
    ld b, 5 ; Bank 5
    ld c, 0 ; Screen ... shadow screen
    ld b, 7 ; Bank 7
    ld c, 8 ; ... 0-2: RAM page (0-7) to map into memory at 0xc000.
    pointblnk pointblnk August 2016 Development
  • New Utility ZXSTLC[b]New Utility ZX Spectrum Tape (& Disk) Loader Creator[/b] I made this utility to easily create tape and +3 disk loaders for my projects and have…

    ... cut it especially for page/bank 7 which clashed with some ... normally composed
    | of memory banks 5, 2 and 0 (standard ... 48k memory layout)
    | LOAD ... | containing only the standard memory pages (5, 2 & 0). In ...
    TomD TomD August 2020 Brand new software
  • compatibility between ZX computers?Hey all, I'm new here :) I was wondering about compatibility between ZX computers. Is it possible to run a game made for ZX80 on a ZX Spectrum? Or a …

    ... not the normal screen memory Dr Beep - BANK 5 is.

    0 ... stuff (you can safely page RAM 7 out and it'll keep ... hence the use of RAM 5 and 7 as the screen pages.
    cyborg cyborg July 2003 Sinclair Miscellaneous
  • 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…

    ... 0-2 RAM page (0-7) to map into memory at 0C000h < ... /> FFFFh +--------+--------+--------+--------+--------+--------+--------+--------+
    | Bank 0 | Bank 1 | Bank 2 | Bank 3 | Bank 4 | Bank 5 | Bank 6 | Bank 7 |
    | | |(also ...
    Fikee Fikee February 2006 Development
  • CEZ-GS strikes back with new Spectrum stuff...Something new is aproaching...March 10th will be a great day for our Spectrum! as you can read in this news... [url]http://computeremuzone.com/?id=n…

    ... Then, it could handle the bank switching transparently. We would still need ... -- you specify the locations in memory for all the data structures ... them in a separate page and just page them in when ... scratch, you could just copy one of the existing subroutines ...
    Alcoholics Anonymous Alcoholics Anonymous March 2007 Games
  • Compatible SpectrumsFollowing some recent coding exploits I've been thinking about compatibility of various models of ZX Spectrum. Yes, it's a common question on the for…

    ... all... due to the memory contention issues. The +2a ... (I think 1, 3, 5, 7) to the 128k/+2 ( ... br /> Of course, if my memory serves me wrong, and in ... for reading the screen memory and that is probably ... all that goodies as RAM bank switching, AY sound, RS232, ...
    ingo ingo October 2007 Hardware
<1234567…34>

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