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<1234567…34>
  • 16k Spectrum.How come emulator's in 16k mode don't provide 32 ram-pack support.

    ... ;173537]Isn't emulating a 16k Spectrum a bit pointless? since ... all the 16k software will run on 48K ... CLEAR to adjust how much memory to use.[/QUOTE]

    On an emulated 16K,
    PRINT PEEK 32768 and PRINT PEEK 65535 will always ...
    Geoff Geoff February 2007 Emulators
  • 16k and PEEK 40000 (on a real 16k Spectrum)?Imagine a real 16k Spectrum (without any RAM expansion or circuits fitted). What would I get if I do a PEEK or try to access memory over 32767? Wo…

    Imagine a real 16k Spectrum (without any RAM expansion ... I do a PEEK or try to access memory over 32767?
    memory (would it be different if ...
    Zup Zup June 2020 Hardware
  • Spectrum 48K - upper memory problemsHi I have a ZX Spectrum 48K issue 3B which does not see upper memory. On PRINT PEEK 23732+256*PEEK 23733 i got result 32767. POKE 32768,85 and PRINT …

    ... not see upper memory.
    On PRINT PEEK 23732+256*PEEK 23733 i ... PRINT PEEK 32768 gave result 95
    POKE 32768,170 and PRINT PEEK 32768 gave ... result 170
    POKE 32768,0 and PRINT PEEK 32768 gave ...
    Edward Edward May 2012 Hardware
  • 48K Issue 2 RAM issuesI have 48K issue 2 board (I've checked, the upper memory is present!). It's not very well. I've not attempted to diagnose one before, so please bear …

    ... (I've checked, the upper memory is present!). It's not ... faulty, or a 16K (it isn't a 16K).

    ... done

    POKE 32768,85 : PRINT PEEK 32768 and this returns 117 ... and
    POKE 32768,170 : PRINT PEEK 32768 returns 174

    kurbeco kurbeco August 2019 Hardware
  • Broken ram or what?Hi! I own ZX Spectrum 48K. When i run command PRINT PEEK 23732 + 256 * PEEK 23733, I should get answer 65535? But i get 49151. In my machine the upp…

    ... issue 4B: thye ROM memory check routine gave me 49152 ... , but apparently, the upper 16K block were ok, as I ... being mapped in the range 32768 - 49151. So, a POKE ... in fact a POKE at 32768.

    As ... 49152,200 . Then, PRINT PEEK 32768 . If you get 100 then ...
    mcleod_ideafix mcleod_ideafix July 2010 Hardware
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... color indicates you what memory bank is faulty ( ... pages, and some more memory. This bank is contended ... The other bank contains memory for the sole use ... memory map you have contains a lower RAM region (16K) ... the result again with PRINT PEEK 32768. Is it 255?
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • ZX Spectrum Plus Versions.Did they ever do a 16K version of the Spectrum Plus? I have just got an early one (Issue 3), with a low serial number 003-037776, and it is fully po…

    ... back with 32767, which is 16K.

    Russ[/ ... which is the last valid memory location. It means that ... , therefore the first faulty memory cell is the first location ... /> POKE 32768,85: PRINT PEEK 32768

    POKE 32768,170: PRINT PEEK 32768
    ...
    Falco-F8L Falco-F8L November 2013 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... try to work as a 16k model.

    The most ... should start up as a 16k model. Now operate the switch ... enter
    POKE 32768,255
    PRINT PEEK 32768
    This should print ... I can not do the memory tests but could it be ...
    Brian Brian May 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... in the machine initialising to 16K, then you've narrowed ... IC23 is preventing the upper memory being seen at all ... the memory check, so the Speccy thinks its a 16K model ...
    POKE 32768, 85: PRINT PEEK 32768
    POKE 32768, 170: PRINT PEEK 32768

    balford balford June 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... ;771804]POKE 32768, 85: PRINT PEEK 32768
    POKE 32768, 170: PRINT PEEK 32768
    ... about the whole upper memory and even more specific ... by just checking one memory location (i.e. 32768, which is I ... the extended memory, as the lower RAM is 16K and the ...
    georgedb georgedb June 2014 Hardware
  • 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…

    ... combo to enter PEEK instead of ... 16k of memory is ROM. Next is the "lower" RAM. Then from 32768 ... PEEK 32768
    Then
    POKE 32768,0
    PRINT PEEK 32768

    POKE 32768 ... ,255
    PRINT PEEK 32768
    1024MAK 1024MAK August 2014 Hardware
  • ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…

    ... start to type in the memory test program
    it ... if I didn't have 16k memory pack present). AND
    - ... I did a small memory test program above RAMTOP like ... ,A
    40 IF PEEK (N) A THEN PRINT " ... - NO ERRORS whatsoever - all memory from 19456 o 32767 was ...
    Tom-Cat Tom-Cat September 2005 Sinclair Miscellaneous
  • Interface 1 Memory Map(I'm not sure which section this post should go in, but here seems as good as any) Since the Interface 1 ROM is only 8k long, does anyone know what …

    ... what appears in the 8-16k memory range when IF1 is paged ...
    MikeW MikeW May 2006 Hardware
  • Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…

    ... a fully working issue 2 16k spectrum and a broken issue3 ... broken spectrum to the working 16k?

    Anyway, Looking at ... !

    I bought the 16k from a friend in 1988 ...
    wozname wozname December 2010 Hardware
  • Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too. [URL="http://www.speccy.org/foro/viewtopic.php?f=8&t=408&start=53"…

    ... LOAD *"m";1;"rom" CODE 32768[/CODE]
    that allows us ... a copy of the first 16K of memory, where the shadow ROM ... copy of the first 16K to address 32768 and above, I ... hl,0
    ld de,32768
    ld bc,16384
    mcleod_ideafix mcleod_ideafix June 2011 Emulators
  • The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…

    ... short boot time indicating a 16K machine. Being an issue 3 ... /> Anyhow doing a 'POKE 32768,85: PRINT PEEK 32768' returned 93, so consulting ...
    balford balford July 2013 Hardware
  • Read Data from memoryHi there. Not been on this scene for a long time. Does anyone know how to do a routine to read data from memory(peek..etc) rather than using lines of…

    ... routine to read data from memory(peek..etc) rather than using lines ...
    davepierce07 davepierce07 May 2014 Sinclair Basic
  • Seriously weird Issue 2 issue... (RAM-related)Hi guys; I have been trying to fix up my Issue 2 and have run across a bizarre issue that I haven't seen elsewhere in the forums. Hopefully one of …

    ... 16k.

    Abbreviations in narrative:

    MEMCHK = PRINT PEEK 23732 + PEEK ... = POKE 32768,85 : PRINT PEEK 32768
    UPRAM170 = POKE 32768,170 : PRINT PEEK 32768

    Trafferth Trafferth August 2014 Hardware
  • Spectrum +2a memoryHi all, Happy New Year. A quick question, I have a Spectrum +2a that I am seeing a very intermittent fault, once every 20 - 30 power ups. I plug…

    ... seems to fail the lower 16K memory test.

    Does anyone ...
    bagpuss22 bagpuss22 January 2015 Hardware
  • Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…

    ... after the swap, PRINT PEEK 23733 returns 128 instead ... were a 16k)

    PRINT PEEK 23732 + 256 * PEEK 23733 ... that address, but PRINT PEEK returned 85, 170, and ... I also tried a simple memory test:
    1 CLEAR ... a,255: LET d=PEEK a: IF d255 THEN ...
    DistantStar001 DistantStar001 June 2022 Hardware
  • Anybody fancy coding this?blah de blah de blah Please ignore, poting error.

    ... 32768 in the sysvars. BASIC can peek and poke the addresses from 32768 ... write 170 to 32768 address but when the memory fetch goes off ... get what is currently in memory address 32768 it actually reads 32767 ...
    dekh dekh March 2007 Development
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... ! Try running it for upper memory only - 32768 to 65535. Not sure ... help as Jetpac is a 16k program. You could try from ... 32767 to try the lower memory. 16384 to 23295 are probably ...
    MrCheese MrCheese January 2009 Games
  • Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …

    ... them up in the slow memory below 32768 and just copy the ... want to use into higher memory before I call it. Once ... of writes to the lower 16K and knocks the functions into ...
    joefish joefish March 2009 Development
  • Screen display at resetJust something for curiosity: When the Spectrum is reseted by for example NEW a very typical screen is shortly displayed. [IMG]http://i33.tinypic.c…

    ... ;384504]Is the 16k model using exactly the ... detects that some memory modules are missing and ... That is, does the 16k model know it is a ... 16k model? :)[/QUOTE]

    No, it just detects no valid memory ... at 32768 and stops at ...
    Dr BEEP Dr BEEP September 2009 Development
  • Spectrum Diagnostics Board - 25th Anniversary projectWell, I said I'd try and get something online about this by today, and I have indeed done so. This web page still needs finishing off (in particular,…

    After the above process, you'd have a TAP file containing a 16k ROM image. To load it into Spectrum memory at 32768, you'd use
    [CODE]
    CLEAR 32767
    LOAD "" CODE 32768
    [/CODE]
    What you'd do with it after that is up to you.
    John Elliott John Elliott October 2009 Hardware
  • Memory concerns with z88dkI've retaken my old spectrum project and sadly I've reached a dead end very fast. I'll try to explain my worst problem in a few lines. I'm not a vet…

    ... /> Don't forget there is memory below 32768 available too (and quite ... music code stuff into top 16k

    XREF music_routine< ... restore original bank into top 16k

    pop hl ... 16k (address $c000 - $ffff). If you look back at the sp1 memory ...
    Alcoholics Anonymous Alcoholics Anonymous December 2009 Development
  • Anybody got a hack for PAW'd games?Has anybody got a hack to browse the text in PAW'd games?

    ...
    20 LET tok=PEEK 37964+256*PEEK 37965
    30 LET ... y=255-PEEK x
    40 IF y ... bbb


    memory dump:
    32768 062 002 205 001 ...
    Bandit Bandit January 2010 Sinclair Miscellaneous
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... to implement the upper memory bank (the last ... because a 16K machine has sockets on upper memory chips, ... your log that the PEEK test didn't give ... a 16K result. If your PEEK was PEEK 23732+256*PEEK 23733, ... isolate a fault in low 16K memory?

    You ...
    mcleod_ideafix mcleod_ideafix August 2010 Hardware
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... the machine to load in 16k mode
    as rom ... 16k of memory

    16385-32768 - contested memory

    32769-49152 - contested memory ... to figure out how the memory addresses tie to the actual ... memory IC's

    ...
    ZXZaber ZXZaber October 2010 Hardware
<1234567…34>

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