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Search Again :: Adv Search 1000 results in 0.019s
<1234567…34>
  • Velesoft's ZX128+2 with 1.5MB memoryMy old ZX128+2 PROFI (grey model - spanish version) for sale here: [url]http://aukro.cz/super-zx-spectrum-128-2-1-5-mb-i2738723874.html[/url] Back s…

    ... )

    - support memory modes of russian ZX clones ... - contain MB02+ memory in full configuration 512kB rom + 512kB sram (ideal for ...
    - zx ram is in sram memory. 8 DRAM chips in ZX ... br />
    - big 512kB memory rom is full reprogrammable direct ...
    velesoft velesoft October 2012 Sales
  • New MEMFACE projectMEMFACE is my old project, but never finished. Now is PCB done (at the post office) and I write firmware for CPLD. MEMFACE is interface with external…

    ... with external memory flash eprom 512kB and sram 512kB, joystick ... /> - can disable external memory on next connected devices (next ... also +2A/+3
    - sram memory 128kB or 512kB
    - Flash ... - emulation of DIVIDE 512kB memory (classic divide, divmmc, divide ...
    velesoft velesoft November 2014 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... />
    If you use fast sram memory in place on original uncontended ...
    velesoft velesoft October 2007 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…

    ... any interface with external rom/sram memory, must be after reset/power ...
    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…

    ... any interface with external rom/sram memory, must be after reset/power ...
    roko roko 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…

    ... 128kB (compatible with ZX128 !!!) + extra sram memory.

    Complette documentation:
    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…

    ... internal ZXCF interface connect 1MB sram memory, then S2008 will collide od ... you must disable internal ZXCF memory if signal ROMCS is disabled ... ZX bus), if internal ZXCF memory is active. If is ZXCF ...
    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…

    ... ZXCF, then will data on sram memory erased. If will used both ... and after second battery without sram erasing

    VELESOFT
    velesoft velesoft January 2009 Hardware
  • Rom upgrade(s) for the Humble spectrum +2 (not 2a or 2b)Hello there my fellow forum chummies, I was thinking today, after reading all this lovely rom burnery stuff, is there a way I could update the ROM o…

    ... other ROM in external eprom/sram memory. But original ZX128 rom must ...
    velesoft velesoft June 2009 Hardware
  • Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…

    ... . Some systems/programs in this sram memory use writing to low 16kB ... can be also in this memory.

    And BATTERY ... computer without data erasing in sram memory. User don't need install ... each power-on. Complette this sram memory can be backup also to ...
    velesoft velesoft February 2010 Hardware
  • Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…

    ... computer without data erasing in sram memory. User don't need install ... Flash ROM, and Flash memory is perfectly adequate for storing ... One True Way to do memory for Spectrum peripherals.[/QUOTE]< ... the hardware (into Flash EPROM, memory card, and glue logic), and ...
    RetroTechie RetroTechie February 2010 Hardware
  • MB02+IDE aliveLast weekend I finished soldering and testing my MB02+IDE. All items work perfectly on +2 grey, on +2A, on 128k heatsink and on 48k Issue2 and 3b tes…

    ... it. At least 1MB of SRAM (but better to have more ... could be placed into such SRAM memory). The final MB02+ would then ... least there could be one memory SRAM chip used for many purposes ...
    Hood Hood September 2010 Hardware
  • The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…

    ... be taken into account: the memory chip should draw enough current ... the data lines from upper memory. Check the datasheet!
    < ... like desoldering all memory chips to put a SRAM instead of them ... ULA, it would surely use SRAM memory and a circuit as described ...
    mcleod_ideafix mcleod_ideafix September 2010 Sinclair Miscellaneous
  • Programming flash eprom on DIVIDE+Can you test it on DIVIDE PLUS ? [url]http://velesoft.speccy.cz/other/flasher-divide-plus.zip[/url] (This flash utility is WINSTON's flasher for dia…

    ... rom and 512kB sram. We can see this memory as rom pages ... 0-31 and sram pages 0 ... . to 384kB of DIVIDE PLUS sram memory. But FATWARE use ram pages ... and 29 at end of sram memory = is dangerous use for RESIDOS ...
    velesoft velesoft November 2010 Hardware
  • Programming flash eprom on DIVIDE+Can you test it on DIVIDE PLUS ? [url]http://velesoft.speccy.cz/other/flasher-divide-plus.zip[/url] (This flash utility is WINSTON's flasher for dia…

    ... to 384kB of DIVIDE PLUS sram memory. But FATWARE use ram ... 29 at end of sram memory = is dangerous use ... 320kB (sram pages 8-27). Any access to higher memory = ... be limited for smaller memory than 32kB. Better idea ... memory (from page 30 to 8(?) ). And last sram ...
    toadstool toadstool December 2010 Hardware
  • RGB to VGA convertor for ZX128/+2/+2A/+3David Luftner release source code (VHDL) of SCANDOUBLER for ZX128/ZX128+2/+2A/+3: [url]http://velesoft.speccy.cz/other/scandoubler-for-zx128_fixed_by…

    ... second complete TV frame to sram memory and internal logic read 60x ... complete TV frame from sram and send it to VGA ...
    velesoft velesoft May 2011 Hardware
  • New DivIDEIs this the only place to obtain a new DivIDE? [url]http://www.lotharek.pl/product.php?pid=25[/url] Tried to purchase a device from there, but am g…

    ... /> - possibility use classic or slim sram memory package
    - switch for use ... disable MREQ to DIVIDE (disable memory access)
    - added holes for ... ports only (complette disable external memory and DIVIDE work as IDE ...
    velesoft velesoft March 2012 Hardware
  • New DivIDEIs this the only place to obtain a new DivIDE? [url]http://www.lotharek.pl/product.php?pid=25[/url] Tried to purchase a device from there, but am g…

    ... /> - possibility use classic or slim sram memory package
    - switch for use ... disable MREQ to DIVIDE (disable memory access)
    - added holes for ... ports only (complette disable external memory and DIVIDE work as IDE ...
    pmsr pmsr March 2012 Hardware
  • New DivIDEIs this the only place to obtain a new DivIDE? [url]http://www.lotharek.pl/product.php?pid=25[/url] Tried to purchase a device from there, but am g…

    ... /> - possibility use classic or slim sram memory package
    - switch for use ... disable MREQ to DIVIDE (disable memory access)
    - added holes for ... ports only (complette disable external memory and DIVIDE work as IDE ...
    velesoft velesoft March 2012 Hardware
  • Experiments mixing ULA+ and Timex Hicolour featuresI'm trying to improve my Verilog skills, so I've written a description of a complete ZX Spectrum 128K (+2 grey ROMs), with AY-3-8912. I wanted to add…

    ... 'm using now has fast SRAM memory, which is very easy to ... if they were two independent memory banks.
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • New DivIDEIs this the only place to obtain a new DivIDE? [url]http://www.lotharek.pl/product.php?pid=25[/url] Tried to purchase a device from there, but am g…

    ... /> - possibility use classic or slim sram memory package
    - switch for use ... disable MREQ to DIVIDE (disable memory access)
    - added holes for ... ports only (complette disable external memory and DIVIDE work as IDE ...
    danilop2k2 danilop2k2 May 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... 8kB EPROM + 8kB SRAM (the same function and memory layout as MULTIFACE ... space is unused.
    In sram memory is used only small stack ... max. 50 bytes from 8kB sram :-D

    My ... nice menu, screen backup to sram, compatibility with ZX128 models, etc ...
    velesoft velesoft August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... EPROM + 8kB SRAM (the same function and memory layout as ... is unused.
    In sram memory is used only small ... menu, screen backup to sram, compatibility with ZX128 models, ... possible to use a memory of 2K instead of ... why put in a 8K memory in the messenger?, many ...
    flopping flopping August 2012 Hardware
  • .SNA snapshot compatability between esxDOS and emulators?Currently I am using a ZX Spectrum 128K (toastrack) with DivIDE Plus (with new GAL's) and esxDOS 0.8.5. It saves and loads 128K .SNA snapshots withou…

    ... , DIVIDE PLUS use battery backup SRAM memory, then after power off and ... . On original divide interface is sram memory erased after power off and ...
    velesoft velesoft July 2013 Hardware
  • New multi-interface for ZXI have in development new interface for ZX Spectrum. PCB size is similar as K-MOUSE interface and on board is CPLD (programmable logic), up to 1MB st…

    ... rom emulation/replacement with external SRAM/FLASH EPROM.

    Rom ... can be loaded to external sram memory and used instead ZX rom ... .
    Interface will support MB02+ memory paging (allram - 512kB ram/flashable ...
    velesoft velesoft October 2013 Hardware
  • New multi-interface for ZXI have in development new interface for ZX Spectrum. PCB size is similar as K-MOUSE interface and on board is CPLD (programmable logic), up to 1MB st…

    ... rom emulation/replacement with external SRAM/FLASH EPROM.

    Rom ... can be loaded to external sram memory and used instead ZX rom ... .
    Interface will support MB02+ memory paging (allram - 512kB ram/flashable ...
    chev chev October 2013 Hardware
  • Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…

    ... DRAM datasheet states that a memory read should be performed to ... will have to calculate the memory address pattern the ULA uses ... is retrieved from a separate SRAM memory chip[/SIZE][/I], with its ... free of the need for memory refreshing cycles. Needless to say ...
    mcleod_ideafix mcleod_ideafix September 2014 Development
  • Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…

    ... is retrieved from a separate SRAM memory chip[/SIZE][/I], with its ... free of the need for memory refreshing cycles. Needless to say ... another story.

    The SRAM stores an additional 4 bits ...
    Matt_B Matt_B September 2014 Development
  • Multi Multiface: the projectI posted some updates on Facebook yesterday about the development of the Multi Multiface, but here is the right place to share all technical findings…

    ... My multiinterface use big sram memory and memory mapping is reconfigurable from ... can be used different memory paging. For example it ... work as original divide memory or new extended model ... continue on finishing. 16bit sram enable adding breakpoints corresponding ...
    velesoft velesoft November 2014 Hardware
  • Multi Multiface: the projectI posted some updates on Facebook yesterday about the development of the Multi Multiface, but here is the right place to share all technical findings…

    ... ZX models, also +2A/+3. Sram memory 512kB, Flash eprom 512kB - full ... rom or sram. In CPLD is possible implement also divide memory or ... any interface based on external memory/joystick.

    [IMG]http ...
    velesoft velesoft November 2014 Hardware
<1234567…34>

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