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<1…13141516171819…34>
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... of IN #xxFE not being contended still bit troubles me.[/QUOTE ... . As long as that is contended, Tw and T3 are held ...
    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... the memory read/write are contended. Could've saved myself weeks ...
    csmith csmith September 2007 Emulators
  • Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…

    ...
    jr c,.b0
    nop
    .b0 rra
    jr ...
    Patrik Rak Patrik Rak September 2007 Development
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... ? You mean the "snow effect NOP" gives all fours? At least ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... ? You mean the "snow effect NOP" gives all fours? At least ... about Spectaculator. The snow effect NOP test, and the lack of ...
    Woody Woody September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... ? You mean the "snow effect NOP" gives all fours? At least ...
    Jon Needle Jon Needle September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... of M1 is really not contended. I wanted to make sure ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... . As long as that is contended, Tw and T3 are held ... case it starts during the contended period. I understand the 1T ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... in range #4000-#7FFF is contended as is any odd page ... -#FFFF range in case a contended page is paged in. This ... high range, port #7FFD is contended as any other odd port ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... the memory read/write are contended. Could've saved myself weeks ... , every other T state is contended (with partial exception of IO ... M3 (memory write) cycles is contended, and so is any other ... other T states are not contended (the additional IO treatment still ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Getting Lifeguard to workI'm struggling with this Muliface utility to find infinite lives cheats. I can get the program to load up, and when I load a game and press the red b…

    ... to assemble from 95ED, typed NOP and Enter to overwrite the ...
    StuBruise StuBruise September 2007 Sinclair Miscellaneous
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... , on 128k is VRAM not contended before TV-ray enters paper ... area. On +3 is contended always. This will definitely influence ...
    omega omega October 2007 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... , on 128k is VRAM not contended before TV-ray enters paper ... area. On +3 is contended always. This will definitely influence ... 7 cycles out of 8 contended whereas the previous models had ...
    Woody Woody October 2007 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... 7 cycles out of 8 contended whereas the previous models had ... 6 out of 8 contended.[/quote]
    Woody, thanks for ... how to transfer data to contended memory with 2T read/write ...
    omega omega October 2007 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... how to transfer data to contended memory with 2T read/write ...
    LaesQ LaesQ October 2007 Hardware
  • Compatible SpectrumsFollowing some recent coding exploits I've been thinking about compatibility of various models of ZX Spectrum. Yes, it's a common question on the for…

    ... /+3 had different pages of contended RAM (I think 1, 3 ...
    ingo ingo October 2007 Hardware
  • Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…

    Ummm,

    Hi Velesoft,
    I thought that high ram (32768-65535) was uncontended whilst low ram (16384-32767) was contended.

    Are you referring to I/O ports being contended? This is new to me.
    BloodBaz BloodBaz October 2007 Hardware
  • Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…

    ... low ram (16384-32767) was contended.

    Are you referring ... to I/O ports being contended? This is new to me ... set, memory 49152-65535 is contended. ULA use for ports same ... mem.page, this port will contended too. (ULA not know difference ...
    velesoft velesoft October 2007 Hardware
  • Ports AccelerationOn ZX48 or 128/+2(grey) is contended and uncontended ports. For example: if you will read 512 bytes sector from IDE device to ZX ram via INI or INIR,…

    ... mem.page, this port will contended too. (ULA not know difference ... example all even ports are contended, but differently. You can check ...
    Patrik Rak Patrik Rak October 2007 Hardware
  • FPGA Spectrum is aliveMy FPGA Spectrum that I started to work on year ago is in 90% ready. I have fixed DDR controller so I can read from it and write to it. I've run som…

    ... used.
    5. As 16k contended RAM an embedded memory is ...
    brian-82 brian-82 November 2007 Development
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ...
    LDIR... failed (0xfb)
    Contended IN... failed (0xfd)
    Floating ... bus... skipped (B=0x01)
    Contended memory... failed (0x01)
    High ...
    gasman gasman November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ...
    LDIR: failed (0x02)
    Contended IN failed: (0x02)
    Floating ... Bus failed: (0xff)
    Contended memory: failed (0x02)
    High ...
    Jon Needle Jon Needle November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... LDIR... failed (0xfb)
    Contended IN... failed (0xff)
    ... skipped (B=0x01)
    Contended memory... failed (0x01)
    Contended IN... failed (0x02)
    ... bus... failed (0xff)
    Contended memory... failed (0x02)
    ...
    Mr. Anonymous Mr. Anonymous November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... ... passed
    LDIR... passed
    Contended IN... passed
    Floating bus ... ... passed
    Contended memory... passed
    High port ...
    gasman gasman November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ...
    LDIR... failed (0x05)
    Contended IN... failed (0x03)
    Floating ... bus... failed (0xff)
    Contended memory... failed (0x02)
    High ...
    Mr. Anonymous Mr. Anonymous November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... ... passed
    LDIR... passed
    Contended IN... passed
    Floating bus ... ... skipped (B=0x01)
    Contended memory... passed
    High port ...
    Mr. Anonymous Mr. Anonymous November 2007 Hardware
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... -82;224891]But how is contended memory refreshed? By constantly reading ...
    Alcoholics Anonymous Alcoholics Anonymous November 2007 Development
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... the instruction fetch. T1 is contended if the instruction fetch is ...
    csmith csmith November 2007 Development
  • Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?

    ... read would result in 0x00 ? NOP. Assuming IFF1 and IFF2 are ...
    zub zub November 2007 Hardware
  • Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?

    ... (RST #38 ) rather than 0x00 (NOP). The Z80 is TTL compatible ...
    Winston Winston November 2007 Hardware
<1…13141516171819…34>

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