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Type: Posts; User: gertk

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  1. Replies
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    The 68030 is a full blown 32 bit CPU with a 32...

    The 68030 is a full blown 32 bit CPU with a 32 bit databus, a 32 bit address bus, 32 bit registers (some even 64 bit) and a MMU unit so that might account for some more complex hardware inside.
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    For the fun of it I tried the 20 MHz Zilog...

    For the fun of it I tried the 20 MHz Zilog Z84C0020PEC in my Kaypro and it works fine (at original speed ofcourse)

    They came form an UK seller for about 7 Euro's a piece
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    64k ram card as in: 64 kilobit, which seems to...

    64k ram card as in: 64 kilobit, which seems to be right :-)
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    Since a WAV file is nothing more than a sampled...

    Since a WAV file is nothing more than a sampled audio signal it depends greatly on the type of signal recorded to have a 'wav2bin' program recognize/decode it to binary data.

    It depends on the...
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    The module I used is an older mbed LPC1768...

    The module I used is an older mbed LPC1768 running at 100 MHz max. I tuned it a bit down to get the VGA screen filled horizontally as the Exidy only emits 512 pixels instead of 640 for a normal VGA...
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    This is what I have been fiddling with: ...

    This is what I have been fiddling with:

    http://kgelabs.nl/?p=277


    After loading the file I set these values and jump to warmstart:
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    The LOADBAS routine is at $E799 I used this to...

    The LOADBAS routine is at $E799

    I used this to detect that CLOAD was called from basic in my emulator, then it diverts to my own code to load the file from SD card and sets the program counter to...
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    You can better take a rom cartridge, these often...

    You can better take a rom cartridge, these often have only one 24 or 28 pin rom/eprom chip, replace that chip for a 24/28 pin socket with a 32k SRAM chip and some simple decode logic. Add a switch to...
  9. Thread: Videotex

    by gertk
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    1,459

    Videotex/Minitel was phased out in 2012 in...

    Videotex/Minitel was phased out in 2012 in France: https://en.wikipedia.org/wiki/Minitel

    Sames is happening with Teletext (a sort of one way serial streaming Videotext, transmitted data in unused...
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    ATX power supplies have two seperate parts...

    ATX power supplies have two seperate parts inside: the main power and the standby power.
    In standby the main power supply is off and only the standby power is applied to the motherboard.

    If you...
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    Yes, just switch off the supply at the primary...

    Yes, just switch off the supply at the primary side (mains switch).
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    If the 520 ST has the TL497 chip on board it...

    If the 520 ST has the TL497 chip on board it does not need the -12V and you can get by with just the +5 and +12 Volt
    Use sufficient sized wires for the +5V and GND lines and use both pins in the...
  13. The monitor connectors can be found on eBay, just...

    The monitor connectors can be found on eBay, just search for '13 pin DIN connector'

    If you want to make a quick hack:
    three strips of 4 pole 2.54mm pin strips also fit, just need to add a single...
  14. Thread: CGA Snow

    by gertk
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    1,861

    If that testprogram is constantly writing to the...

    If that testprogram is constantly writing to the screen(memory) without checking for retrace then you will have snow on CGA
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    From what I've read it is configurable.

    From what I've read it is configurable.
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    I found this also: ...

    I found this also:

    http://texteditors.org/cgi-bin/wiki.pl?EXPRESS

    Will give it a try this week to see how it works
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    What about keeping an extra buffer just for the...

    What about keeping an extra buffer just for the screen, perhaps with longer than 80 character lines?

    If you scroll, insert or delete a line you can then update the memory but for character inserts...
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    Well it is not vi but on the Kaypro I use an...

    Well it is not vi but on the Kaypro I use an editor called VDO and it works quite well, the Ctrl keystrokes are a bit awkward but once you get to know them it is very workable.
    It can handle up to...
  19. Well without another disk, controller and/or...

    Well without another disk, controller and/or drive you could try and make some small assembler program and type it in in the monitor.
    With a few Bios calls you might be able to read a sector from...
  20. You can dump the contents of BC00 from within the...

    You can dump the contents of BC00 from within the monitor, see if it has some sensible data.
    The fact that it tries to read the disk track zero is standard CP/M behaviour, it then loads in the...
  21. Tried some USB copying myself yesterday and found...

    Tried some USB copying myself yesterday and found out that with some USB sticks (esp. USB3.0 on USB2.0 port) there can be a seriously slowdown after a few seconds of fast transfer. But only on FAT32...
  22. Probably a DC/DC converter for generating the...

    Probably a DC/DC converter for generating the programming voltages.
  23. And still you want to return to a closed source...

    And still you want to return to a closed source OS ? I don't get it.
    What 'bugs' do you encounter with Linux ? No OS is perfect and updates are there every day.

    If you select a clean and lean...
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    What I noticed is that every first byte of a page...

    What I noticed is that every first byte of a page of memory is 00 and the rest is FF, maybe that can give a clue what is happening.
    Like: addresslines 0-7 at logic '0' give '00' at the data bus or...
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    Were there any harddisk systems for the Exidy ?...

    Were there any harddisk systems for the Exidy ? Preferably with some info on IO addresses and/or controller so I can add it to my ARM Exidy emu.
    I find that little over 300k per floppydisk can be...
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