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Search Again :: Adv Search 1000 results in 0.016s
<1234567…34>
  • 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 …

    ... />
    [CODE]
    ;; ram-check
    L11DA: LD H,D ... ; pair.

    ;; RAM-FILL
    L11DC: LD (HL ... JR Z,L11EF ; forward to RAM-DONE if faulty.
    ... />
    [CODE]
    ;; ram-check
    EX DE,HL
    antoniovillena antoniovillena April 2012 Development
  • 48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…

    ... points me towards checking the RAM.

    I have entered ...
    wep855 wep855 August 2014 Hardware
  • Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…

    ... />
    11DA RAM-CHECK LD H,D Transfer ... /> RAMTOP).
    11DC RAM-FILL LD (HL),+02 ... fails.
    11EF RAM-DONE DEC HL HL ...
    wilsonsamm wilsonsamm August 2007 Sinclair Miscellaneous
  • Repaired some 128K's todayI have lot's of ZX Spectrums laying aside with some more complex defects. Today I decided to try to fix some of them. I thought: why not share my ex…

    ... .. it was not a ram chip: the 'shortcircuit' ... course I already removed a ram chip :( stupid...
    ... screen there was some ram checking done when booting, ... diag board I did a ram check, which failed .. :mad:
    ram chips from the documentation ...
    bverstee bverstee December 2011 Hardware
  • What happens during a reset?I always used to wonder about this, but only thought a bit more about it last night when noticing after all these years what actually happens. Obvio…

    ... ?

    Just before the RAM-CHECK and after the

    Geoff Geoff February 2006 Sinclair Miscellaneous
  • 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…

    ... issue. ROM init loop ($11DA RAM-CHECK) writes $02 to every location ... wondered why they don't check for anything but $01).
    RAM access time is usually stamped ... right after the RAM part number, generally after a ...
    Marcelo Marcelo March 2007 Hardware
  • Trouble with Spectrum 48kI think it is a Rev 3 (Issue 3 on the motherboard). The screen has weird characters, instead of text, and the keyboard is not responding (although it…

    ... . It does that during its RAM check. If I'm not mistaken ...
    RetroTechie RetroTechie September 2009 Hardware
  • Trouble with Spectrum 48kI think it is a Rev 3 (Issue 3 on the motherboard). The screen has weird characters, instead of text, and the keyboard is not responding (although it…

    ... . It does that during its RAM check. If I'm not mistaken ...
    kwyjibo kwyjibo September 2009 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... a -5V used by lower RAM).
    [*]Check clock signals (video+Z80 ... inspection of the board to check for obvious faults, melted ... working Speccy to check function.
    [*]Replace lower RAM (because that's ... s, you might want to check [URL="http://bitcycle.org/ ...
    RetroTechie RetroTechie March 2010 Hardware
  • Octode - new eight channel beeper music engineYes, another one. This engine provides eight channels of tone, without volume or decays, and with small pauses between rows, so it is Wham-like. It a…

    ... does not fit into the ram, check test.asm, change org #c000 ...
    Shiru Shiru March 2011 Development
  • 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 …

    ... reach HL=0001 because double check. So I optimized a ... bit more doing a simple check.

    And to ... .

    [CODE]
    ;; ram-check
    EX DE,HL

    ;; RAM-FILL
    L11DA: LD (HL ...
    antoniovillena antoniovillena April 2012 Development
  • What's going on during a reset?Always wanted to know this. Why does the screen fill with garbage then white lines on black then just a totally black screen? What is happening?

    ... br /> [code]
    ; -----------------------
    ; THE 'RAM CHECK' SECTION
    ; -----------------------
    ; Typically, a ... visible.

    ;; ram-check
    L11DA: LD H,D ... ; pair.

    ;; RAM-FILL
    L11DC: LD (HL ...
    Dunny Dunny May 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    You have checked that you have -5V +12V and +5V on the lower ram (4116's) and +5V on the high ram?

    CHeck the spectrum repair guide on this site, is very useful.
    Johan1973 Johan1973 June 2012 Hardware
  • ZX Interface 1 Odd ProblemI have just upgraded a rubber key ZX Spectrum (issue 3) to a ZX Spectrum+. Oddly, when used with a ZX Interface 1, CAT 1 produces a question mark. T…

    ... OK, maybe not.
    So check the expansion bus - yup, M1 ... socketed one), and connected a RAM pack. 48K. Load up ... the tracks above the dead RAM chip were gouged - wonder ... />
    Seriously odd. CPU - check. ULA - check. RAM - check.

    Hmm...
    ...
    Spirantho Spirantho June 2013 Hardware
  • Old homemade hardware?Hey there, I've been given a bunch of ZX Spectrum stuff, I've mostly fixed the computer, just need a membrane. But what I was wondering is that there…

    ... . Just about to do a RAM check now.

    Edit: Whoops ...
    Clym5 Clym5 September 2013 Hardware
  • Spectaculator BlogHi All, I've decided to start a Spectaculator development blog [URL="http://www.spectaculator.com/category/blog"]here[/URL]. Normally months (somet…

    ... part of the ROM's RAM check routines. Every (working) ZX Spectrum ...
    rich_chandler rich_chandler June 2014 Emulators
  • Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …

    ... remove them, and then check to make sure you ... Fit IC sockets, re-check your work and then ... get what you expect, check the associated circuitry around ... detailed guidance! I will check up on the link ... I'll remove the lower ram, check the voltages, fit sockets ...
    Spekkie Spekkie August 2014 Hardware
  • 48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…

    Remove all lower RAM, check for shorts/broken traces. Beware ... board (as far as lower RAM goes), power up and test ... one of Zorn's lower RAM boards. That should solve your ...
    DEATH DEATH September 2014 Hardware
  • Guess the video faultI've two dead flesh Spectrums, one a 16K issue 2 outputting white with a tinge of blue (not as extreme as photo shows) with two pink horizontal lines…

    ... else changed, I ran a RAM check and its stated 65535, I ...
    brownb2 brownb2 January 2015 Hardware
  • ZX Resets when loading programs?Hello, I have a weird issue with my new ZX Spectrum issue 2 16K. The ZX is in great condition, BASIC works and the RAM Diagnostic PEEK 23733 reports …

    The RAM check done by the ROM is ... will not pick up all RAM faults. If you leave the ...
    1024MAK 1024MAK May 2015 Hardware
  • 48K colour issuesGentlemen, A friend handed me over a number of 48K machines to service, and among these there are four of them with various flavours of colour iss…

    ... ROM with the Fruitcake 128K RAM tester in it. When resetting ... before the very first visible RAM check begins, where the subcarrier signal ...
    Opus Discovery Opus Discovery September 2015 Hardware
  • Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…

    ... that it has a rom/ram check feature, so time to use ... and TR5 replaced.
    Lower ram replaced
    Z80 replaced
    lesoleil70 lesoleil70 November 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... . It's to allow OKI RAM to be used as upper ... RAM rather than the Texas Instruments ... TI or OKI upper RAM.

    Check for a short (or ... or more of the lower RAM ICs. It's a very ...
    Zorn Zorn December 2015 Hardware
  • +2 Gray ProblemI'm trying to repair a +2 gray that behaves differently at every boot up. Some rare times I can get the selection window but pretty soon the characte…

    ... one, i get the same ram check error about data line 5 ...
    gtsamour gtsamour May 2016 Hardware
  • Fun little program but why do I get Out of Memory ?This is very simple BASIC/machine code program. You can rotate the scene with "b" and "m" but I seem to get an error going in one direction and not …

    ... toward the top of RAM.

    Check your offsets and make ... sure they point to the correct RAM ...
    Ast_A_Moore Ast_A_Moore March 2017 Sinclair Basic
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... from the point of the RAM check.

    I set the ... to jump ahead to the RAM check.

    So I decided ... wrong with the chatter between RAM and Z80, which Mark already ... . Any advice on what to check next, or at least on ...
    Mikelone Mikelone April 2017 Hardware
  • Can I fix it?This PC was stored in a the spare bedroom at a jaunty angle of 30 degrees for several months. I powered it up today and was greeted with a 1..2.3. b…

    I had that fault recently; the tones indicated a RAM check error. Fortunately, re-seating the memory fixrd it; one of the modules had eased out of its slot slightly.
    Battle Bunny Battle Bunny September 2018 Chit chat
  • Black And WhiteA new game (128K only) created for the Play On Retro project by the Pat Morita Team, authors of the great [i]Ninjakul 2.[/i] Last year a demo was …

    ... it said to do a RAM check, but in 48k mode that ... the ramtop, then you can check 16k or bigger aswell and ...
    AD-RS1600i AD-RS1600i May 2020 Brand new software
  • 128K refurb.... What is the best way?Here's the latest Spectrum I got... Finally got a Toastrack... Not sure if it was good value ( around US$100 ). [img]https://os.blackice.com.au/us…

    ... 128 boot with half the ram?[/quote]

    Loss of ... run with only half the RAM operational, but you need a ... does not do the same RAM check as the 16K/48K ROM ...
    1024MAK 1024MAK March 2021 Hardware
<1234567…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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Related Threads

  • Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code:<br /> <br /> [CODE]<br /> ;; ram-check<br /> L11DA: LD H,D ; Transfer the top value to the HL registe…
  • 48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets.<br /…
  • How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement.<br /> Know what I found? My old ZX Spectrum.... Those were the days!<…
  • check this out on ebay[url="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&amp;item=2305920012&amp;category="]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&amp;item=230…
  • Retro-Active Reviews has launched, check us out!Yes, my first ever website is now a go. I've got eleven Crash/ZZAP! style reviews up and ready to read (out of fifteen planned, the other four will …
  • I am going to check my entire collection of tapes tommorrow....I must confess to being very lazy with my Spectrum tapes, all tapes for that matter, I just have them piled in boxes around the place.<br /> <br /> <…
  • Check this out!This is the funniest link I have seen for ages..<br /> <br /> [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6754&amp;forum=4&amp;0"…
  • check out pics of my woody[url="http://homepages.tesco.net/mel_the_bell/files/misc_pics/woody.jpg"]http://homepages.tesco.net/mel_the_bell/files/misc_pics/woody.jpg[/url]<br /…
  • Check out my willyim proud of my willy, me<br /> <br /> [url="http://homepages.tesco.net/mel_the_bell/files/misc_pics/willypic.gif"]http://homepages.tesco.net/mel_the_…
  • HELP 4532 or 4864 RAM wanted !Hello<br /> <br /> My real spectrum fell off yesterday<br /> I know that one RAM memory chip is out of order<br /> There was 8 X HM4864P-2 but I saw …

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