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<1234567…34>
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …

    ... examining and modifying each possible RAM location, from low to high, ... again, testing the next memory location. Otherwise, the loop terminates ... read from the upper RAM location retrieved the decimal value ... to be the highest working RAM location.

    I ...
    Zorn Zorn April 2012 Hardware
  • Creating a POK from RAM or binary.Don't know if this is the right category or not but here goes. I'm working on a bug fix for a game, it's a few hundred bytes worth of custom code …

    ... said file from a set RAM location or a binary? I could ...
    Ersh Ersh October 2016 Development
  • Issue 2 Spectrum - Black screenHi I have an issue 2 spectrum which I'm having some issues with. I bought it on ebay so have no idea of the history or how it came to be broken. Whe…

    ... that one of the lower RAM chips was faulty. I ... that this is an upper RAM fault.
    As ... get the corresponding upper RAM location and sure enough IC 16 ... I replaced the offending upper RAM chip but it made no ... some of the lower RAM chips about to different ...
    whoremoan whoremoan November 2014 Hardware
  • 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 …

    ... screen will go black as RAM 7 is full of zeros ... redirected to a different physical RAM location. If it were a copy ... and RAM 5 was still used what ...
    cyborg cyborg July 2003 Sinclair Miscellaneous
  • Problem with SPIN assemblerCan anybody tell me why the following machine code program doesn't assemble in the SPIN assembler? ; my first machine code program ld bc, 5 ret Any…

    ... directive followed by a valid ram location so that Spin knows where ...
    TrueVideo TrueVideo January 2007 Development
  • Spectrum+ - multiple issuesHi all Yesterday I picked up a Spectrum+ (via eBay) to add to my collection. Now, before any of the names I recognise from the last few months of l…

    ... me that the last good RAM location was 32767.

    I ... therefore wrote to location 32768 with the following values ...
    szeliga szeliga April 2009 Hardware
  • Official CSSCGC 2010 Competition ThreadDear Wossers, As 'loser' of the 2009 competition, I am now obliged to host the 2010 competition. I have created a site which will provide a hub for …

    ... , or copy them to some ram location? ;)
    guesser guesser October 2010 Games
  • FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…

    ... moved to any unused ROM location of at least 67 bytes ... address first of 5-byte location.
    PUSH HL ; save address ... /> The routine only uses one RAM location for temporary storage of SP ...
    mcleod_ideafix mcleod_ideafix October 2011 Sinclair Basic
  • Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code: [CODE] ;; ram-check L11DA: LD H,D ; Transfer the top value to the HL register LD L,E …

    ... single DEC (HL) for the RAM test. Even leaving both DEC ... , which is the last valid RAM location.
    obo obo April 2012 Development
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... that we can test higher ram in 16K mode by shorting ... / BASIC where the last working RAM location is.

    However, when ... POKE to test the higher RAM :)

    [I][B]Mark ...
    1024MAK 1024MAK October 2012 Hardware
  • ZX81 internal RAM board?Just a quick question to Zorn (amongst others). What would the issues be with fitting one of Zorn's RAM boards into an unexpanded ZX81? Seems to me…

    ... special hardware, just 16k of RAM.
    [*]Second are the ... data from the currently addressed RAM location.
    [*]Third, there ... are UDG types, where RAM is normally mapped to replace ... Swatosch ZX81 site[/URL] (includes RAM pack modification details)
    ...
    1024MAK 1024MAK October 2014 Hardware
  • 48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…

    ... the addresses of the RAM chips are not being ... the same as another valid RAM location, hence you getting the ... />
    Run the RAM test that was linked to ... what type of "upper" RAM chips are fitted? Is the ... "upper" RAM selection link in the correct ...
    1024MAK 1024MAK November 2014 Hardware
  • Spectrom interface ?Hi all, I got 2 of this devices ... :) [img]http://forest.no-ip.org/wos/spectrom/20151006_151428.jpg[/img] [img]http://forest.no-ip.org/wos/sp…

    ... with what is filling spectrum ram and what is start address ... happens, the external ROM (or RAM) temporarily occupies the lowest 16 ... 16 K to the RAM, jumps to a RAM location, triggers the device ...
    zPasi zPasi October 2015 Hardware
  • Was there a POKE that broke the SpectrumHi Everyone I've been recalling myths and rumours from back in the day. You know "Lunar Jetmans" trailer and that sort of thing. But one rumour …

    ... will only find ROM and RAM. POKE in BASIC simply writes ... . Poking any value into any RAM location may cause the the BASIC ...
    1024MAK 1024MAK October 2015 Sinclair Miscellaneous
  • Russian-speaking topic - Multiface 3Hi friends! The Administration will not mind if I create a topic in which you can communicate in Russian? No politics. No racism. Speccy only! :-) …

    ... border change routine into Multiface RAM at $23E8-9 (low ... /> Poking the value $00 to RAM location $2003; will page the 8K ... multiface RAM into locations $2000-$3FFF: overlaying ... back in, poke $01 to RAM location $2003.
    At least two ...
    GReW GReW March 2016 Hardware
  • ZX Dandanator! Mini - Cartridge system for SpectrumsHi All, I'd like to present a little HW I've developed during the last three months. It's aimed at providing a console-like usage experience for a…

    ... to load an app into RAM, next bank switching interface get ... copy or decompression from another RAM location.

    Take a look ...
    RMartins RMartins July 2016 Hardware
  • Location of variableHi everyone When basic makes an array how to you find out the location in the ram of where the data is stored. :) Also, does it store the values in…

    ... you find out the location in the ram of where the data ...
    Robin Robin September 2010 Sinclair Basic
  • How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…

    ... this and displays in the location. But this involved loading register ... assign the first K of ram to video memory and the ... is accessing the higher order ram (> 16K) the ULA (or ...
    Robin Robin January 2011 Hardware
  • changing extended RAM pages in SpinIs it possible to edit the data in 128k extended RAM pages in Spin? I've tried both the debugger tool and the pokes tool and, although they let me ma…

    ... the data in 128k extended RAM pages in Spin? I've ... gets applied to the corresponding location in main memory instead.
    Battle Bunny Battle Bunny July 2011 Emulators
  • Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code: [CODE] ;; ram-check L11DA: LD H,D ; Transfer the top value to the HL register LD L,E …

    ... L,E ; pair.

    ;; RAM-FILL
    L11DC: LD (HL ... /> ;; RAM-DONE
    L11EF: DEC HL ; step back to last valid location ... /> ;; RAM-DONE
    L11EA: DEC HL ; step back to last valid location ...
    antoniovillena antoniovillena April 2012 Development
  • CAT!RAM and PUTRAMLast year sometime I posted a couple of routines to: * catalogue the 128k RAMdisk in BASIC; * move RAMTOP and the stacks from BASIC. CAT!RAM and PUTR…

    ... from BASIC.
    CAT!RAM and PUTRAM are updated ... />
    As CAT!RAM is in BASIC and is ... swapping around RAM pages to get at ... CAT!RAM prints file name & type, RAMdisk page-coded location & ... br /> The listings follow. CAT!RAM will work on any 128k ...
    Battle Bunny Battle Bunny December 2012 Sinclair Basic
  • quick RAM copy using LET in BASICI'm in the process of reviewing, revising and refining all the programming tips & utility routines which I've posted on this forum over the last eigh…

    ... different segments of free RAM). Although the routine will ... string to RAM or RAM to string or RAM to RAM
    ... string expression, or destin location if in RAM;
    b$=source ... string expression, or source location if in RAM;
    l =length ...
    Battle Bunny Battle Bunny July 2013 Sinclair Basic
  • Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…

    ... "safest" address in RAM for such a table?< ... (incl. Speccy) do a RAM test
    at startup. ... table before
    the RAM test / it will get ... . What if we replace RAM checking
    code with ... ... loop code sets every memory location to 2.
    uploop:
    tstih tstih July 2014 Development
  • Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…

    ... the last good memory location being the top of 16k ... version of Balford's ram test diagnostics said the ... whole of upper RAM was faulty (check all ... ve removed all the upper RAM ICs, replaced with sockets ... />
    Given the lower RAM used to be okay, and ...
    Paulcatchpole Paulcatchpole December 2016 Hardware
  • How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement. Know what I found? My old ZX Spectrum.... Those were the days! Never …

    ... ZX81, though.
    3K om RAM, my friends!
    My question ... I tell what size of RAM I've got in my ...
    David David February 2001 Sinclair Miscellaneous
<1234567…34>

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