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<1…17181920212223…34>
  • Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…

    ... 799702]Yup, it's a contended memory thing. Your snapshot version is ... 3, where Page 6 is contended, the sound distorts because the ... being used and arrange the memory into different pages accordingly.[/QUOTE ... extra code in a different memory bank?

    If ...
    daveysludge daveysludge October 2014 Development
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... rate is constant too. A test ROM that counts interrupts would ... br />
    The zx-diagnostics test ROM I work on has ... such a test, but it's fairly ... at the end of the memory test.

    I'll ... into that ROM's ULA test mode, sounds like it ...
    balford balford November 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... show up as a failed memory test.

    I'd examine ...
    balford balford November 2014 Hardware
  • Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…

    ... too and all the messy contended memory and clock halting stuff.
    contended RAM? does the ULA halt ...
    guesser guesser November 2014 Hardware
  • Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…

    ... too and all the messy contended memory and clock halting stuff.[/QUOTE ... correctly (basically, following the same memory timings as the Z80 is ...
    Winston Winston November 2014 Hardware
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... if the computer has no contended memory?
    mcleod_ideafix mcleod_ideafix November 2014 Development
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... out (I think): making memory accesses to contended memory when the ULA is ... contending memory causes it to stop ... has no contention in video memory :( (or does it?)
    mcleod_ideafix mcleod_ideafix November 2014 Development
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... (I think): making memory accesses to contended memory when the ULA is ... contending memory causes it to ... has no contention in video memory :( (or does it?)[/QUOTE ... somewhere (not necessarily in the memory area) that can be ...
    Einar Saukas Einar Saukas November 2014 Development
  • 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…

    Tried to load the memory test program, but nothing I tried ...
    whoremoan whoremoan November 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…

    ... " RAM if the ROM's memory test got confused.

    Then ...
    1024MAK 1024MAK November 2014 Hardware
  • A dangerous 6th key?Or even 7th for that matter. What's the general consensus on action games that require more keys than QAOP-Spc*? Which key do you choose for that d…

    ... it's more of a memory test (being able to remember the ...
    paranoid marvin paranoid marvin November 2014 Games
  • A dangerous 6th key?Or even 7th for that matter. What's the general consensus on action games that require more keys than QAOP-Spc*? Which key do you choose for that d…

    ... it's more of a memory test (being able to remember the ...
    MattLamb MattLamb November 2014 Games
  • 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…

    ... /> I tried to load the memory test program and it still didn ...
    whoremoan whoremoan November 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 simple poke and peek memory test, but not all of the ... memory was seen. Also occasionally a ... !!!
    Tried to run the memory test that ZORN linked to from ...
    whoremoan whoremoan November 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…

    ... now managed to get the memory test program to load.
    I ... as follows.

    Lower memory test failed after a few passes ... .
    I then ran the test again a couple of times ... [/IMG]

    The upper memory test I also ran a few ...
    whoremoan whoremoan December 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…

    ... and now the simple peek test is giving me the number ... machine.
    Ran the upper memory test again and ran through several ... .
    However! Ran the lower memory test again and it failed on ... the screen corruption and lower memory errors go away.

    whoremoan whoremoan December 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…

    ... ;806182]However! Ran the lower memory test again and it failed on ...
    Zorn Zorn December 2014 Hardware
  • Speccy Vs Amstrad CPC Vs C64I hope no one minds me posting this here as well as in the announcements section. I'll delete it if there is a problem. It's childish fun but can I …

    Uridium is purely a memory test; on the later levels the ...
    paranoid marvin paranoid marvin December 2014 Games
  • 48K Not booting properlyBought another faulty spectrum from Ebay. This one, when you turn it on, it looks like it's going to boot OK, but when it gets to the point where it…

    ... then tried to load the memory test program from Zorns website but ...
    Zorn Zorn January 2015 Hardware
  • A redesigned version of Winston's diagnostic board[U][B]A redesigned version of Winston's diagnostic board[/B][/U] This is a continuation of a project that started in a hijacked thread [URL="http://…

    ... - I've added +2A/+3 memory test functionality to the firmware.
    balford balford January 2015 Hardware
  • 48K Not booting properlyBought another faulty spectrum from Ebay. This one, when you turn it on, it looks like it's going to boot OK, but when it gets to the point where it…

    ... again attempted to load the memory test program and it worked this ...
    whoremoan whoremoan January 2015 Hardware
  • A redesigned version of Winston's diagnostic board[U][B]A redesigned version of Winston's diagnostic board[/B][/U] This is a continuation of a project that started in a hijacked thread [URL="http://…

    ... - I've added +2A/+3 memory test functionality to the firmware.
    bagpuss22 bagpuss22 January 2015 Hardware
  • Speccy Vs Amstrad CPC Vs C64I hope no one minds me posting this here as well as in the announcements section. I'll delete it if there is a problem. It's childish fun but can I …

    ... it's as much a memory test as a shoot-em-up ...
    Matt_B Matt_B January 2015 Games
  • Spectrum +2 (grey) RAM issueHi, I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue. I used to be able to load games very reliably by playing converted TAPs and …

    ... little bit misleading when diagnosing memory errors on a +2. ... The 128K of memory is split into two parts - contended (meaning that ... with one RAM chip in contended memory will generally affect all bits ... across the four contended pages, in this case - ...
    balford balford February 2015 Hardware
  • spectrum +2A loading problemHi new here ! I have recently purchased a 2A thinking it would be more reliable than my old rubber key machine and external tape drive. Problem i…

    ... would be to run a memory test (which will also exercise the ...
    1024MAK 1024MAK February 2015 Hardware
  • Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…

    ... will be placed in memory.

    "test.c" - c program
    test.c test_asm.asm -o test2 ... --reserve-regs-iy -Ca-D__SDCC test.c test_asm.asm -o test2 ... I got permission denied on test as output filename. I'm ...
    Alcoholics Anonymous Alcoholics Anonymous February 2015 Development
  • important Harlequin modWhile searching for a better solution for avoiding undesired spikes that corrupt the screen RAM at Harlequin I found a final solution. No additional …

    ... ) one is containing the video ("contended") memory that has to be read ... . Therefore access to the higher memory is faster.
    So is ... 16kB of the lower (video) memory chip are used. By changing ... to use this 16kB extra memory but it would not be ...
    ingo ingo March 2015 Hardware
  • TV Tie-insThose of you who listen to the Retro Asylum podcast will know that our latest episode focused on TV tie-in games. So I'm just wondering what your fav…

    ... cheap, the game is a memory test of weither you'll trip ...
    dm_boozefreek dm_boozefreek March 2015 Games
  • 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 …

    Pretty sure this is a lower memory problem, any way you can change the 4116 chips, or change the positions? Zxzigg has a memory test program try running that first.
    patzik patzik May 2015 Hardware
  • Contended memory and TritoneQuick question regarding contended memory...<div style="font-style: normal;"><br></div><div style="font-style: normal;">I'm testing ideas with Triton…

    ... player code itself is in contended memory then every single instruction has ...
    Alcoholics Anonymous Alcoholics Anonymous June 2015 Development
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Latest Posts

  • I am currently watching.....
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    mel the bell on April 20

HitBox

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contended 1.2K 2K
memory 21.8K 32.5K
test 14.3K 19.1K

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