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<1…15161718192021…34>
  • 80x24 mode (Timex required)Hopefully Martijn will be adding this to the archive soon, but until then grab it here: [url]https://dl.dropbox.com/u/15659782/BASIC80.zip[/url] Th…

    ... hard to have to swap memory banks to have a high ... as Timex was planning a external memory expansion (the Bus Expansion Unit ...
    Encarnado Encarnado August 2012 Sinclair Basic
  • 80x24 mode (Timex required)Hopefully Martijn will be adding this to the archive soon, but until then grab it here: [url]https://dl.dropbox.com/u/15659782/BASIC80.zip[/url] Th…

    ... hard to have to swap memory banks to have a high ... as Timex was planning a external memory expansion (the Bus Expansion Unit ... RAM to steal from main memory the display. The Timex solution ...
    chev chev August 2012 Sinclair Basic
  • 80x24 mode (Timex required)Hopefully Martijn will be adding this to the archive soon, but until then grab it here: [url]https://dl.dropbox.com/u/15659782/BASIC80.zip[/url] Th…

    ... . The BEU is an external memory banking scheme. The TS2068 has ... that can disable all internal memory. The BEU can accommodate ... mixture of external banks can exist in the 64k memory map ... the designer of the individual memory banks.


    ...
    Alcoholics Anonymous Alcoholics Anonymous August 2012 Sinclair Basic
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... SAM COUPE only if 1MB external memory is connect...

    [url ... on NMI only). On DIVIDE memory (or after modify messenger paging ...
    velesoft velesoft August 2012 Hardware
  • Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…

    ... presents a problem, because the memory in the lower 16K of ... paged out by external devices, leading to the external memory fighting with what ...
    Winston Winston August 2012 Hardware
  • Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…

    ... presents a problem, because the memory in the lower 16K of ... paged out by external devices, leading to the external memory fighting with what ...
    guesser guesser August 2012 Hardware
  • Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…

    ... load easy select number of memory page with rom. In rom ... writeprotect can be active MB02 memory mode (512kB flash eeprom + 512kB ... rom, then can disable memory access for all external devices (PROFI set ... and ignore ROMCS line from external devices)
    velesoft velesoft August 2012 Hardware
  • Something that just occured to me (Windows 8 related)Even though personally I probably won't be putting Windows 8 on any of my PCs, as it offers no real advantage for me, I have to keep my hand in with …

    ... faster, uses less boot-up memory, runs less services, etc.
    external hard-drive they run concurrently ... so that the external hard drive is constantly having ...
    takapa takapa August 2012 Chit chat
  • IX register woes - or is SPIN buggy?Or am I missing something? I'm trying to use the IX reg to acess a table containing an x and y coord. My code below just doesnt seem to work proper…

    ... used as a pointer to external memory.[/quote]
    (I presume that ...
    Battle Bunny Battle Bunny November 2012 Development
  • SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…

    ... a nice 2^n memory matrix like external memory. There may be some ...
    RetroTechie RetroTechie November 2012 Emulators
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... /> 000xxxxx Kempston
    xxxxxx0x AY/Memory Paging
    xxx0xxxx ZXCF
    0001xx1x Kempston
    xxx1xx0x AY/Memory Paging
    xxx0xx1x ZXCF

    External Divide will possible connect only ...
    velesoft velesoft December 2012 Hardware
  • How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…

    ... a Spartan-6 FPGA *including* memory for a 48K model. Without ... have to be a few external components.
    Winston Winston December 2012 Hardware
  • 16k --> 48kI bought a zx and found out it was a 16k since when I execute PRINT PEEK 23733 I get 127 Does it mean I get a lesser model? What limitations do I h…

    ... I do. There are also external expansions, but I don't ... =0&turns=0&memory=1&language=0& ... : you can filter results by memory size.
    snigfarp snigfarp December 2012 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... />
    My old version of external 128kB upgrade support also ROM ... interest will version with one memory socket (for sram+flash eprom ...
    velesoft velesoft December 2012 Hardware
  • Altera CPLD vs Xylinx FPGAI will dig into the world of FPGA's, mainly to find something that can replace one or more GALs for my current and new projects. And it's never bad t…

    ... . However, most FPGAs need an external flash chip and have to ... tables can be used as memory (Xilinx calles it "distributed RAM ... example the Spartan 3 (if memory serves) has a 4 input ...
    Winston Winston January 2013 Hardware
  • Can't downloadHi there. I can't seem to download anything from the WOS archive. It seems to time-out or something. I have a fien intenret conection and can down…

    ... your computer or to some external device?

    The computer ... to a USB-connected memory stick or external HD. I always get ...
    ZnorXman ZnorXman January 2013 Sinclair Miscellaneous
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... -ons which have their own external memory". Looking at some schematics and ... was done to prevent an external device from paging in an ... external ROM and therefore having to ... and disable its own internal memory if another device behind it ...
    Fruitcake Fruitcake January 2013 Sinclair Miscellaneous
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... ]

    This is impossible. External memory can't contain videoram. This ...
    velesoft velesoft January 2013 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    [QUOTE=velesoft;674492]This is impossible. External memory can't contain videoram.[/QUOTE]

    well it [I]can[/I]...


    it just has to contain the video generation circuits (ULA + PAL generation) too :p

    ;)
    guesser guesser January 2013 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... />
    If you connect this external memory upgrade to ZX with 48kB ... between internal dram chips and external sram chip. Both chips can ...
    velesoft velesoft January 2013 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... original ZX Spectrum 16kB then external memory upgrade is full usable without ...
    velesoft velesoft January 2013 Hardware
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... .

    info about divide memory 3Dxx mapping:
    - is't ... internal ZX rom and connect external divide rom+ram. Problem can ...
    velesoft velesoft January 2013 Hardware
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... .

    info about divide memory 3Dxx mapping:
    - is't ... internal ZX rom and connect external divide rom+ram. Problem can ...
    1024MAK 1024MAK January 2013 Hardware
  • Beta diskJust something that's been bugging me for a while, is the 128k beta disk interface wired differently to the beta 48k as a piece of hardware, or as I …

    ... different rom adress for connect external memory. TR-DOS are connect if ...
    velesoft velesoft February 2013 Hardware
  • 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 …

    ... to do some processing & memory access on its own. For ... ]
    That's how MSX2 memory mappers work. Discrete logic implementations ... internal + 1 or 2 MB external is the biggest you'll ... />
    But despite 4 MB. memory mappers existing for decades (and ...
    RetroTechie RetroTechie February 2013 Hardware
  • 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 …

    ... page an infinite amount of memory, limited only by the paging ... order address lines for your external memory.

    You OUT 8 ...
    guesser guesser February 2013 Hardware
  • 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 …

    ... order address lines for your external memory.

    [/QUOTE]

    ArtemKuchin ArtemKuchin February 2013 Hardware
  • 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 …

    ... page an infinite amount of memory, limited only by the paging ... order address lines for your external memory.

    You OUT 8 ...
    Knik Knik February 2013 Hardware
  • Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…

    ... it will destroy every memory content from the beginning ... code writes to every memory location from 0000 so ... 3, or if some external device puts it into the ... whenever there is a memory access to 0000-3FFF ... each and every ROM memory location, everytime a write ...
    mcleod_ideafix mcleod_ideafix February 2013 Sinclair Miscellaneous
  • Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…

    ... , as it will destroy every memory content from the beginning of ... ]Your code writes to every memory location from 0000 so it ... +2A/+3, or if some external device puts it into the ...
    Timmy Timmy February 2013 Sinclair Miscellaneous
<1…15161718192021…34>

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external 4K 5.3K
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