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<1…16171819202122…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…

    Well, if I am about to achieve accurate screen sampling, I really have to ask the questions like at what cycles are the screen data sampled and how comes the FAQ suggests that some of them are not in fact contended, don't I?
    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…

    ... because contention was investigated using IO instructions, and the assumption was ... that IO and Mem contention were the ... don't use a single IO instruction have identical behaviour on ...
    Philip Kendall Philip Kendall 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…

    ... memory, is [B]not[/B] contended.
    2) There is just ...
    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…

    ... memory read/write is not contended and I think it is ...
    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 T2-T4 are not contended and both T2 and T3 ... make sure the T1 is contended unless it ends at least ... that T1 is in fact contended unless it ends 3 cycles ... last attribute fetch is not contended. This way, all M1, M2 ...
    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 ...
    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…

    ... of interest for memory and IO contention testing. I have run ...
    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…

    ... of M1 is really not contended. I wanted to make sure ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • What did Spectrum BASIC lack (and was BBC BASIC so good?)Over the years, I've read in various multi-format magazines, that BBC BASIC was probably the best BASIC available on an 8-bit machine. I've never use…

    ... /O address space - so device IO didn't suck up valuable ...
    Winston Winston September 2007 Sinclair Basic
  • Leave AY Chip alone guysWould you have a go at a child with down syndrome? No, thought not. AY has Asberge Syndrome, it's a form of Autism - think of that please before y…

    ... old could have coded accurate IO contention using Visual C++...
    rich_chandler rich_chandler September 2007 Chit chat
  • Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…

    ... looks a lot like an IO port address. Course, 0x1f is ...
    zub zub October 2007 Hardware
  • How many different versions of the divIDE are there?So what gives with these interfaces? Some have thru ports, some have built in joystick interfaces - some are based upon one design, one is designed …

    ... . You have a 24 bit IO port which can be used ...
    ingo ingo 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 ...
    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
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    ... reply - note that for an IO request, it's IORQ=low ...
    Winston Winston October 2007 Hardware
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    ... /> The interface MB02+ (FDD, HDD, IO-Ports) contains the same PIO ...
    ingo ingo October 2007 Hardware
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    ... machine.

    In particular, IO bus timings are on page ...
    Winston Winston 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
<1…16171819202122…34>

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