Changes between Version 3 and Version 4 of TeradriveHardwareNotes


Ignore:
Timestamp:
08/03/2024 07:52:39 AM (9 months ago)
Author:
Mike Pavone
Comment:

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  • TeradriveHardwareNotes

    v3 v4  
    5252
    53531160:
    54       Selects an 8 KiB page from kanji/romdisk/MD ROM (note only the upper 4 KiB of the page is visible on the MD side when MD firmware is enabled)
    55       Set to 21h when unlocking MD side and in BIOS boot
    56       Set to 0 by BIOS after initial 68K boot
     54      Selects an 8 KiB page from kanji/romdisk/MD ROM (note only the upper 4 KiB of the page is visible on the MD side when MD firmware is enabled)\\
     55      Set to 21h when unlocking MD side and in BIOS boot\\
     56      Set to 0 by BIOS after initial 68K boot\\
    57571162:
    58       Controls address of memory window in 286 address space
    59       Effectively top byte of real mode segment address or physical address >> 12
    60       Normally initialzied from a value stored in CMOS
    61       Set to CE if value in CMOS is invalid
    62       Window is 8KiB in size and is used for both PC-side access to MD hardware and the Kanji/romdisk ROM
     58      Controls address of memory window in 286 address space\\
     59      Effectively top byte of real mode segment address or physical address >> 12\\
     60      Normally initialzied from a value stored in CMOS\\
     61      Set to CE if value in CMOS is invalid\\
     62      Window is 8KiB in size and is used for both PC-side access to MD hardware and the Kanji/romdisk ROM\\
    63631163:
    64       bit 0: Enables auxilliary ROM on 68K side
    65       bit 1: Enable 286 memory window into 68K addres space (must be clear when booting 68K)
    66       Set to 1 by BIOS and during MD unlock procedure
     64      bit 0: Enables auxilliary ROM on 68K side\\
     65      bit 1: Enable 286 memory window into 68K addres space (must be clear when booting 68K)\\
     66      Set to 1 by BIOS and during MD unlock procedure\\
    6767
    6868
    … …  
    131131U62: ALS245A (Octal bus transceiver)\\
    132132U63: NEC D4714 (RS-232 Line Driver)\\
    133 U64: ALS373 (Octal transparent latch)
     133U64: ALS373 (Octal transparent latch)\\
    134134U65: ALS244A (octal buffer and line driver with 3-state outputs)\\
    135135U66: IBM 89X8922 (128Kx4 DRAM)\\