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Search Again :: Adv Search 1000 results in 0.014s
<1…17181920212223…34>
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... actually used to support 48K RAM, but it's unclear whether ... when doing POKE's and PEEK's to ROM space to ...
    mcleod_ideafix mcleod_ideafix November 2011 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…

    ... a max of 16K of ram, can it still be done ... familiar with the ZX81 memory map. All I know is that ... fast enough, just short on ram.

    From little acorns ...
    moggy moggy December 2011 Sinclair Miscellaneous
  • How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…

    ... ..... I use the top of RAM for IM2 table, stack, back ... :smile:. I have a large map that needs to be on ... boundary at the top of RAM, so I'd have to ...
    R-Tape R-Tape January 2012 Development
  • Rubber 48k troublesHi. I've just got a 48k to add my collection, but it seems doesn't working well. The computer starts ups finely, but it doesn't load the games. So fa…

    ... /> If not, maybe an upper ram fault.[/QUOTE]

    Hi ... />
    I typed:
    PRINT PEEK 23733
    and the answer ...
    Spectrum Spectrum January 2012 Hardware
  • AY-interface for ZX81 (at last ;) )Hi, it exists finally ;) - compatible with the most standard one - ZonX. [url]http://www.sellmyretro.com/offer/details/Brand_New_Sinclair_ZX81_MrX_A…

    ... about the ZX81's memory map or if it even has ... but started running short on RAM.

    Here's a ...
    moggy moggy February 2012 Hardware
  • DATA vs PRINT and OVERjust messing about and came across this alternative way of drawing a map....now before I start mucking about with my actual program.....is there any …

    ... the system variable DATADD (PEEK 23639+256*PEEK 23640) tells you the ... and using a DEFADD (PEEK 23563+256*PEEK 23564) secondary variable area ... DATA as a string the map could be referenced directly in ...
    Battle Bunny Battle Bunny February 2012 Sinclair Basic
  • SIDBlaster/ZX - new soundcard for ZX-SpectrumThis soundcard is for ZX-Spectrum compatible computers. It uses in its work MOS Technology SID soundchip, which together with MOS Technology 6510 mic…

    ... and a C64 compatible memory map.

    Depending upon the ... can replicate the C64 memory map using 64K of RAM.
    mcleod_ideafix mcleod_ideafix February 2012 Announcements
  • SIDBlaster/ZX - new soundcard for ZX-SpectrumThis soundcard is for ZX-Spectrum compatible computers. It uses in its work MOS Technology SID soundchip, which together with MOS Technology 6510 mic…

    ... and a C64 compatible memory map.

    Depending upon the ... replicate the C64 memory map using 64K of RAM.[/QUOTE]

    map, and interrupt controller from VIC ...
    BYTEMAN BYTEMAN February 2012 Announcements
  • stuck on recursive functionI want this function to PEEK 'l' bytes from memory starting at 's' and return them as a string, but however much I fiddle about with quoting and pare…

    ... returns a single character from RAM each time it's executed ... be summarised as:
    * CHR$ PEEK (s) returns the addressed byte ... ) the first iteration gives CHR$ PEEK ( 56168 ) and then VAL$ sees ...
    Battle Bunny Battle Bunny February 2012 Sinclair Basic
  • WANTED: Britain Invaded! instructions[deleted]

    ... /> I've had a quick peek at the listing and played ... number then ENTER), scrolls the map left, right, up or down ... "n" squares.

    The map of Southern England is 44 ...
    Digital Prawn Digital Prawn February 2012 Wanted
  • The Sinclair ZX Microdrive Resurrection Project (long)Dear Spectrum fans! [Management summary: Download [url]http://www.bartheld.net/temp/mdv2img.zip[/url] and tell me what you think. All help very much…

    ... spend with updating the sector map in the lower third of ... it's possible to map the DivIDE RAM/ROM in and out ... 7 individual sector copies in RAM.

    [QUOTE=RetroTechie;608037 ...
    Volker Volker March 2012 Emulators
  • Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…

    ... 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Enter)".
    ram?[/quote]

    Your ... are" part of the top RAM. Specifically, these two chips store ... RAM.

    Do a POKE 32769,0 and PRINT PEEK 32769 ...
    mcleod_ideafix mcleod_ideafix March 2012 Hardware
  • Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…

    ... 's don't "control" top RAM. They "are" part of the ... top RAM. Specifically, these two chips store ... ) RAM.

    Do a POKE 32769,0 and PRINT PEEK 32769 ... [/url]

    Regarding the RAM, these things are expensive! What ...
    Asure Asure March 2012 Hardware
  • Exilei\'m sure this has been brought up before but couldn't find a thread in 'New Game Ideas'. Why did the Spectrum never get a port of the BBC game Exile…

    ... 1/4 of the 512K RAM. You still need a load ... 's half of the uncontended RAM on a 48K or (at ... being able to alter the map in real time.

    joefish joefish March 2012 New game ideas
  • Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…

    ... 4164 and since the upper RAM was socketed, I replaced ... out one of the upper RAM chips, and with some ... going on with the upper RAM now! To cut the ... the sockets for the upper RAM were the cheap kind and ... Speccy boots fine, let's peek some memory locations - OK. ...
    deckard deckard April 2012 Hardware
  • ROM switch on NMIHello! Please, help me or point in the right direction. I am building a project for 48k spectrum which must activate its rom (actually static ram) …

    ... out 1K of ROM and map their RAM into a window of ... computer is turned on the RAM is already mapped into ROM ...
    ArtemKuchin ArtemKuchin April 2012 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... on the first byte of RAM. Usefully, this is the ... a. I confirmed the lower RAM (IC13) was not at ... suspecting that an upper RAM IC would be the ... Spectrum. POKE and PEEK in upper RAM suggested more than one ... de-soldered all the upper RAM and fitted sockets.
    ...
    Zorn Zorn April 2012 Hardware
  • How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…

    ... use all of the available RAM any way you want. There ... in running code in contended RAM so long as it isn ... thought taking map,tile (or whatever) data from contended RAM was slower ...
    R-Tape R-Tape April 2012 Development
  • Encyclopaedia GalacticaThis is the development thread for Encyclopaedia Galactica, the game upon which I'm currently working, along with a few others. The idea is that the…

    What Im afraid about this is that Pavero will gonna need a RAM slot expansion to make the consequent map =)
    judasEZT judasEZT June 2012 Development
  • Issue 1 ram connectors....Hi Does anyone have the pinout of the Issue 1 internal RAM connectors, for the 16K-> 48K upgrade board, as I'd like to try and make myself a board, a…

    ... the RAM chip in the top 32K of the address map.
    prime prime July 2012 Hardware
  • P.A.W. - Help needed!!!!Hello!!! Anyone knows the algorithm used to convert bytes in the Spectrum RAM of P.A.W. games into ASCII? Back in the 1980s-1990s I knew how to do …

    ... ://marcoagpinto.cidadevirtual.pt/images/View RAM as ASCII.png[/IMG]
    All I remember is: chr=Peek (address)-value and then another ...
    marcoagpinto marcoagpinto July 2012 Development
  • Issue 1 ram connectors....Hi Does anyone have the pinout of the Issue 1 internal RAM connectors, for the 16K-> 48K upgrade board, as I'd like to try and make myself a board, a…

    ... the RAM chip in the top 32K of the address map.
    1024MAK 1024MAK July 2012 Hardware
  • 128k gone badHi All, Turned my 128k on this morning and... [img]http://www.w.angold.btinternet.co.uk/bad128small.jpg[/img] Can anyone help? whats the most lik…

    Almost certainly bad RAM (one or more bad RAM ICs)

    If you have a DivIDE or any other piece of hardware that makes a 128K come up in USR 0 mode, if the failure is in upper memory it's very easy to find using BASIC POKE and PEEK.
    Winston Winston August 2012 Hardware
  • 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…

    ... it pages out the video RAM?
    It doesn't need ... image?[/QUOTE]

    The RAM being used to display the ... paged in to the memory map. The RAM paging is relevant to ...
    BloodBaz BloodBaz 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…

    ... paged in to the memory map. The RAM paging is relevant to ...
    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…

    ... quite a lot of RAM to steal from main ... was to have 'sideways' RAM that you could page in ... have 128K of sideways RAM available if you connect ... with 16k ROM and 48k RAM. You have the EXROM ... exist in the 64k memory map simultaneously. Whether the individual ...
    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…

    ... /* */


    /* EPROM and RAM chip selects */
    eprom_ram_en = !ROMMREQ ... />
    /* RS latch to map Messenger */
    r_input = write_port_77;
    - EPROM/RAM are unmapped when port 77h ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... ). If address 0038h doesn't map to anything (for example, because ... if this happens, EPROM and RAM should be active whenever ROMMREQ ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • .tapein load crashes if no CLEAR performed first(!)Hi Guys, Can anyone explain the following as it has be stumped: I came across an unexpected crash today when loading in a 16K block of code at 8000…

    ... ,201
    30 PRINT PEEK 23730+256*PEEK 23731, USR here
    RAM fault, causing RAMTOP to be ...
    Battle Bunny Battle Bunny August 2012 Hardware
  • Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…

    Just replaced the RAM again machine, results this time are 32825, peek 85=2
    Macc Macc August 2012 Hardware
<1…17181920212223…34>

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