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<1…21222324252627…34>
  • LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…

    And copying from and to contended memory is a real time- ... . Buffer the screen in non-contended memory and always copy from ...
    joefish joefish June 2010 Development
  • Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …

    ... ROM). The problem is that contended memory access isn't just ... square-wave tone channels) in contended memory. It sounds pretty funny ...
    ccowley ccowley June 2010 Announcements
  • Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …

    ... ROM). The problem is that contended memory access isn't just ...
    Mister Beep Mister Beep June 2010 Announcements
  • Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …

    ... square-wave tone channels) in contended memory. It sounds pretty funny ...
    Mister Beep Mister Beep June 2010 Announcements
  • A question about M1 cyclesI'm writing an interrupt routine that, after the usual register pushes, will jump to a location of my choice with a [b]JP (IY)[/b] instruction. If I…

    ...
    ei ; 4 T
    nop ; 4 T

    ; TOTAL ...
    ajmoss ajmoss July 2010 Development
  • A question about M1 cyclesI'm writing an interrupt routine that, after the usual register pushes, will jump to a location of my choice with a [b]JP (IY)[/b] instruction. If I…

    ... table will reside in non-contended memory, somewhere in the address ...
    ajmoss ajmoss July 2010 Development
  • Whole New Horizons! The only ZX-Spectrum 48k intro competition with a theme![B][I]MacBuster^MagicSoft/Extreme[/I][/B] brings you an amazing action!!! "Imagine yourself it is January or 1982 again and... No! I say no - you're…

    ... because the whole memory is contended.
    Shiru Shiru July 2010 Announcements
  • multicolor on 48Kmany people tried multicolor 8x1 on 48K model and ended with maximum width about 18 chars. yesterday i tried [b]8x2[/b] on 48K and achieve 24 char wi…

    ... , you really get hit by contended memory.

    (The one ...
    gasman gasman July 2010 Development
  • Curious "Pud-Pud" screenshotYou may notice of a curious screenshot made for this article appeared at Microhobby magazine (the one at the bottom left) from Jonathan "Joffa" Smith…

    [QUOTE]did ya find all 10 puddings?[/QUOTE]

    Nop. I'll have to do a try in minutes, or maybe before.
    Neil Parsons Neil Parsons July 2010 Games
  • Silly question on Russian clonesIv a silly question to ask... Iv been looking at web links about Russian ZX clones with envious eyes, wondering if I might spend money on something…

    ... ULA timings except for the contended memory -> [url]http://translate ...
    Shockwav3 Shockwav3 July 2010 Hardware
  • Cant DecideI have had a lot of spectrums in my time from the 16k to the +3 and as we all know they all have flaws. I am thinking about buying another and wanted…

    ... games are written for the contended RAM of the +2A and ...
    chev chev July 2010 Hardware
  • Embedding external code in Z88DK projects (Beepola related)Hi all, I've been doing a few things in Z88DK, but I was wondering how I could link binary data compiled separately into my projects. Specifically I…

    ... your song isn't in contended ram though. 32768+ is okay ...
    FrankT FrankT July 2010 Development
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... . The Russian machines have no contended RAM to worry about. The ... both video RAM pages are contended. The standard Pentagon doesn't ...
    chev chev August 2010 Hardware
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... the pages that are not contended on any of the 128s ...
    chev chev August 2010 Hardware
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... />
    Port 0x7FFD is itself contended, and horribly so. I only ...
    ajmoss ajmoss August 2010 Hardware
  • Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…

    ... ;464692]Port 0x7FFD is itself contended, and horribly so. I only ...
    chev chev August 2010 Hardware
  • Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …

    ... from uncontended memory during the contended part of one raster (the ...
    joefish joefish August 2010 Development
  • Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…

    ... time, 8 T-states when contended. The RAM contention pattern on ... Spectrum is 128T (16*8 ) contended, 96T (24*4) uncontended. Therefore ...
    ajmoss ajmoss August 2010 New game ideas
  • Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…

    ... time, 8 T-states when contended. The RAM contention pattern on ... Spectrum is 128T (16*8 ) contended, 96T (24*4) uncontended. Therefore ...
    ewgf ewgf August 2010 New game ideas
  • Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …

    ... it won't run in contended memory (e.g. where your ...
    BloodBaz BloodBaz September 2010 Hardware
  • Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …

    ... it won't run in contended memory (e.g. where your ...
    guesser guesser September 2010 Hardware
  • Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …

    ROM loading DOES work in contended memory with some adjustments. I ... have the ROM in non-contended and the regular screen visible ...
    nuggetreggae nuggetreggae September 2010 Hardware
  • Another machine code problem, sorry[CODE] OPCODE HEX ADD LD A,00 3E00 F000 PUSH AF F5 F002 LD B,05 0605 F003 LD C,06 0E06 LOOP F005 POP AF F1 ADD A,C 80 DEC B 05 …

    ... the first command was 0 (NOP). You could then call your ...
    joefish joefish September 2010 Sinclair Basic
  • compressing basicI thought I'd ask here instead of the basic forum.. in the sense of giving me 1 command line, and NOT the whole listing joined up etc. and it uncom…

    ...

    25659 0 STACK: NOP
    [/code]
    Battle Bunny Battle Bunny September 2010 Development
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... /> You might wish to add NOP and HALT instructions, which are ...
    Matt_B Matt_B September 2010 Chit chat
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... in the high nibble - a NOP in the low nibble (0000b ...
    BloodBaz BloodBaz September 2010 Chit chat
  • designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…

    ... /> opcode set opcode set
    nop I made no comment
    Jonathan Harston Jonathan Harston September 2010 Chit chat
  • 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…

    ... more memory. This bank is contended. The other bank contains memory ... />
    If the non-contended RAM is damaged, the machine ... machine.

    If the contended RAM is damaged, the computer ... : a chip in the contended bank is damaged. Further analysis ...
    mcleod_ideafix mcleod_ideafix October 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…

    ... seems to be pointing to contended memory ,

    ok how ...
    ZXZaber ZXZaber October 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…

    but what physical IC no's are the contended memory ?
    ZXZaber ZXZaber October 2010 Hardware
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