Changes between Version 11 and Version 12 of geniuspc


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Timestamp:
May 26, 2012, 12:02:17 PM (12 years ago)
Author:
pulkomandy
Comment:

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  • geniuspc

    v11 v12  
    88 * Cartridge port, apparently on memory bus with system ROM and storage flash. The french system comes with cartridges only containing straps, likely shorting some pins enable extra features...
    99
    10 The ROM seems to be a 16-bit one, available directly on the CPU bus. The FLASH is 8-bit, but directly on the CPU bus  as well. The cartridge port is connected to the same bus, and can be used for extra flash storage.
     10The ROM is a 16-bit one, available directly on the CPU bus. The FLASH is 8-bit, but directly on the CPU bus  as well. The cartridge port is connected to the same bus, and can be used for extra flash storage.
    1111
    1212Both flash chips (internal and cartridge) are 8-bit only. This means they can't be used for executable code.
    … …  
    1919 * LMT324 : LM324, used as audio amplifier
    2020 * C807U : Toshiba microcontroller. Handles mouse and keyboard scanning, LEDs, on/off buttons, etc. Running at low speed out of internal RC oscillator, as there is no external crystal for it. Seems to communicate with the VTech chip through a serial link.
    21  * VTech 27-05793 : of course a datasheet of this one woumd make things easier. Seems to be also called "LS05PR730C102" ?
     21 * VTech 27-05793 : of course a datasheet of this one would make things easier. Seems to be also called "LS05PR730C102" ?
    2222
    2323
    24 Output : RGB color video and mono sound.
     24Output : RGB color video (french version, others have composite output) and mono sound.
    2525
    2626Color palette is at least 15 colors :
    … …  
    4040 * Mauve
    4141 * Pink
    42 (the 16th color is likely "darker-than-black", used for blanking)
     42(the 16th color is likely "darker-than-black", used for blanking ?)
    4343
    4444Resolution seems to be something like 480x200. This makes a 48K framebuffer. Top and bottom borders can have different colors.
    45 
    46 The Genius PC is a home computer from VTech. Released in the late 90s, it is one of the last microcomputers.
    47 
    48 = Hardware : =
    49  * Motorola MC68EC000, 16-bit external databus, 32MHz
    50  * 256K of RAM
    51  * 1 to 4M of ROM (not sure yet) - Sharp LH537NWN mask ROM
    52  * Mass storage : 128KB flash memory - AM29F010
    53  * Cartridge port, apparently on memory bus with system ROM and storage flash. The french system comes with cartridges only containing straps, likely shorting some pins enable extra features... The german version seems to have extra flash memory or maybe ROM ?
    54 
    55 The ROM seems to be a 16-bit one, available directly on the CPU bus. The FLASH is 8-bit, but directly on the CPU bus  as well. The RAM is accessed through the VTech 27-05793 chip, which likely handles memory refresh.
    56 I don't know if the RAM is mapped as 16 or 8-bit to the CPU.
    57 
    58 == Other chips ==
    59  * BH7236AF : Video encoder (PAL/NTSC + RGB output). On french motherboard RGB is used, composite is not wired.
    60  * LMT324 : LM324, used as audio amplifier
    61  * C807U : Toshiba microcontroller. Handles mouse and keyboard scanning, LEDs, on/off buttons, etc. Running at low speed out of internal RC oscillator, as there is no external crystal for it. Seems to communicate with the VTech chip through a serial link.
    62  * VTech 27-05793 : of course a datasheet of this one woumd make things easier. Seems to be also called "LS05PR730C102" ?
    63 
    64 
    65 Output : RGB color video and mono sound.
    66 
    67 Color palette is at least 15 colors :
    68  * White
    69  * Light grey
    70  * Dark grey
    71  * Black
    72  * Sky blue
    73  * Blue
    74  * Red
    75  * Green
    76  * Dark green
    77  * Yellow
    78  * Orange
    79  * Brown
    80  * Dark brown
    81  * Mauve
    82  * Pink
    83 
    84 Resolution seems to be something like 480x200
    8545
    8646== Serial port ==