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Search Again :: Adv Search 1000 results in 0.018s
<1234567…34>
  • 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 …

    ... what appears in the 8-16k memory range when IF1 is paged ...
    MikeW MikeW May 2006 Hardware
  • 48K Memory MapHi, I'm having some trouble understanding the top of the 48K Memory Map. From reading elsewhere I have this as the memory map: 0 to 16383 - …

    ... the top of the 48K Memory Map.

    From reading ... I have this as the memory map:

    0 to ... br /> 23755 to 65367 - Available Memory
    65368 to 65535 - User ... area '23755 to 65367 - Available Memory'

    Also what ...
    jonesypeter jonesypeter March 2016 Development
  • Some ROM/EPROM questions...I've got a ZX Spectrum +, a +2A and +3 computers, and I've been using +3e project ROMS for a while in my +3. I was thinking about using an EEPROM or…

    ... and out in the lower 16K memory map by software.

    Switching ...
    Winston Winston June 2010 Hardware
  • Memory Map/ContentionHi I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scrolling…

    ... ask is this a correct map for memory contention?

    Address Size Area

    0000-3fff 16k ... 5B00-7fff 08k Contended Memory
    8000-FFFF 32k ... Fast Memory (well normal memory really :) )
    < ...
    ZJones ZJones September 2006 Development
  • 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…

    ... original Spectrum 128K memory map (with only one 16K bank pageable) and ... on the Pentagon switches memory banks as described in ... Second category of expansion of memory over 128k.

    memory over 128k.[/quote]
    ...
    ajmoss ajmoss August 2010 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
  • Disable onboard memoryWould this work...? Access to onboard I/O can be disabled by holding IORQGE high. Would it be possible to create a MEMRQGE in a similar way to disa…

    ... ROMCS but for the whole memory map?

    Translating the IORQ ... piece of on-board memory and map external memory over it. CP/M ...
    Jonathan Harston Jonathan Harston June 2007 Hardware
  • +2A extended memory map & ULA bug?The [URL="http://www.worldofspectrum.org/faq/reference/128kreference.htm"]128K reference page[/URL] says: [quote]The ULA bug which causes snow when I…

    ... set to point to contended memory still occurs, and also appears ... set to point to contended memory.[/quote]

    Will the ... , with RAM bank 4 (contended memory) in 0x0000-0x3FFF, and place ...
    ajmoss ajmoss June 2010 Hardware
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... a bit of a tangled memory map at a chip level, the ... and blow the entire lower 16K of RAM in one go ...
    Womble Womble August 2010 Hardware
  • Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…

    ... a fully working issue 2 16k spectrum and a broken issue3 ... broken spectrum to the working 16k?

    Anyway, Looking at ... !

    I bought the 16k from a friend in 1988 ...
    wozname wozname December 2010 Hardware
  • ZX81, AY, samples, SpecAY, AY files, etc.With the appearance of 3 different AY interfaces for the ZX81 in the past 6 months, I wonder... Is it possible to make the ZX81 "speak" or play digi…

    ... memory requirement. Assuming most ZX81 users only have a max of 16K ... not familiar with the ZX81 memory map. All I know is that ...
    zxbruno zxbruno August 2011 Sinclair Miscellaneous
  • Spectrum +2a memoryHi all, Happy New Year. A quick question, I have a Spectrum +2a that I am seeing a very intermittent fault, once every 20 - 30 power ups. I plug…

    ... seems to fail the lower 16K memory test.

    Does anyone ...
    bagpuss22 bagpuss22 January 2015 Hardware
  • Execution map file support in different emulatorsAs I'm now seeking about execution map files, the different emulators support, I want to start a new discussion here. Today, I tried to create a mem…

    ... I tried to create a memory map with Z80 emulator, but ... Z80 emulator:
    file extension: *.map
    file size: 8192 bytes ... byte of the 64 k memory area.
    bit = ... SpecEmu emulator:
    file extension: *.map
    file size: 65536 bytes ...
    clausjahn clausjahn July 2015 Emulators
  • 48k Memory MapIs there a link or info anywhere that explains the 48k memory layout? My game uses double buffering and I'm trying to decide where the best memor…

    Is there a link or info anywhere that explains the 48k memory layout?

    My game uses double buffering and I'm trying to decide where the best memory location should be.
    Atari_Jetman Atari_Jetman September 2015 Development
  • My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …

    ... is where devices can access memory WITHOUT having to use the ... original machine due to a memory configuration that was designed for ... RAM in the lower 16k of the memory map.
    [quote] One idea ... the machine to so little? Memory costs very little compared to ...
    cyborg cyborg October 2002 Sinclair Miscellaneous
  • ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…

    ... with the my ideas of memory management in a future Spectrum ... the machine bank switches in 16k blocks. Essentially what I'm ... managing different parts of the memory map), ZXCF fits into this much ... ROM management by loading each 16k block into different pages of ...
    MikeW MikeW April 2006 Hardware
  • ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…

    ... />
    Memory is based around a possible 256 banks of 16k. The ... - Block 0 bank select (0-16k)

    Ports 00BF ... /> any writes to the 0-16k address range are discarded).
    memory map, while
    expanding the ...
    MikeW MikeW April 2006 Hardware
  • ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…

    ... />
    Memory is based around a possible 256 banks of 16k. The ... - Block 0 bank select (0-16k)

    Ports 00BF ... /> any writes to the 0-16k address range are discarded).
    memory map, while
    expanding the ...
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Hardware
  • MAME on the Spectrum?Yes, I know it's currently AY's job to make ludicrous posts (a position he's filling in very well, until TKRAP returns), but just out of interest, if…

    ... Speccy. You need the first 16K present as RAM for most ... chance of it fitting in memory and running at a decent ... have full control over the memory map (except on the +3, Timex ... used to identify the memory map, i/o port map, screen mapping, etc ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Emulators
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... you can make up whatever memory map you want. There may have ... plan to page in 0-16k of the dock permanently so ...
    Alcoholics Anonymous Alcoholics Anonymous December 2006 Development
  • TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…

    ... the ROM gives you a 16k hole in the memory map).
    Winston Winston March 2007 Hardware
  • Multi-tasking OS on the Spectrum?Do you think it is possible to build a multi-tasking operating system on the Spectrum? That is, most important the ability to have several task run…

    ... You could make "sorta" protected memory for a Z80 computer - have ... page of memory anywhere in the Z80's memory map, and have ... the scheduler only page in the memory ... part of the memory map is the lowest 16K (without doing hardware ...
    Winston Winston November 2007 Development
  • z88dk 1.8 releasedSince I am the most regular of the z88dk peeps to post here I might as well let you all know that v1.8 has been released. [code] A little later than…

    ... rampack) + at least 32k ram. 16k is too small for the ... .

    Default (and customizable) memory map info for each target:
    Alcoholics Anonymous Alcoholics Anonymous March 2008 Development
  • VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…

    ... VIC 13K 11.5K
    16K Expanded VIC 21K 19.5K ... released was 16K.

    As Jimmy told me, the memory map changes ... a larger block of contiguous memory. VIC BASIC can only use ...
    Digital Prawn Digital Prawn August 2008 Sinclair Miscellaneous
  • VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…

    ... released was 16K.

    As Jimmy told me, the memory map changes ... a larger block of contiguous memory. VIC BASIC can only use ... contiguous memory.[/quote]

    Which 1 ... ,5K of memory is used for that purpose ...
    Dr BEEP Dr BEEP August 2008 Sinclair Miscellaneous
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... run 50% faster and the 16k DRAMs holding display data would ... introduce inconvenient holes in the memory map. At that time RAM was ... been done is split the 16k video ram into two 8k ...
    Alcoholics Anonymous Alcoholics Anonymous November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... run 50% faster and the 16k DRAMs holding display data would ... introduce inconvenient holes in the memory map. At that time RAM was ... been done is split the 16k video ram into two 8k ...
    andrew_rollings andrew_rollings November 2009 Emulators
  • Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…

    ... crashes were due to this memory allocation copied an pasted from ... /> Don't forget there is memory below 32768 available too (and ... at it).

    Yes, memory gets used up quickly :-) If ... 16k (address $c000 - $ffff). If you look back at the sp1 memory map ...
    Alcoholics Anonymous Alcoholics Anonymous December 2009 Development
  • just thinking about ...compo for zx 16k ? anyone ?

    ... how to use im2 on 16k model.
    well, it is ... gives chance to make custom memory map instead of manouevring between bytes ... /> did anyone some research on 16k model ?

    i make ... /> a) check sprite routines of 16k games
    b) mimic stormlord ...
    Fikee Fikee December 2009 Development
  • SAM programmingHi Can anyone provide any example hello world or graphics/sprite printing style machine code routines for the SAM? I can't seem to find anything rem…

    At Chris said, memory paging is key to getting ... it as it describes the memory map, hardware ports, etc.

    16K pages = 512K


    obo obo September 2010 Development
<1234567…34>

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  • 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…
  • Interface 1 Memory Map(I'm not sure which section this post should go in, but here seems as good as any)<br /> <br /> Since the Interface 1 ROM is only 8k long, does anyon…
  • Memory Map/ContentionHi <br /> I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scr…
  • Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation?<br /> <br /> 6144 bytes divided into 3 blocks, 2048 bytes long. i…
  • +2A extended memory map & ULA bug?The [URL="http://www.worldofspectrum.org/faq/reference/128kreference.htm"]128K reference page[/URL] says:<br /> [quote]The ULA bug which causes snow …
  • New memory model: 16K/48KAs earlier suggested in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=32096"]this thread[/URL], there was also Spectrum software that …
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