Changes between Version 10 and Version 11 of TeradriveHardwareNotes


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Timestamp:
08/07/2024 07:17:51 AM (9 months ago)
Author:
Mike Pavone
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  • TeradriveHardwareNotes

    v10 v11  
    11== Hardware Overview
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    3 The Sega Teradrive consists of a 286 IBM PC integrated with a Sega Megadrive. The PC side is fairly standard and is built around a Western Digital chipset found in a number of other 286 and 386 systems, including the IBM PS/55 5510Z which has some additional similarities to the Teradrive. The main components of the PC chipset are the WD76C10LP system controller (DRAM controller, memory map, etc.), the WD76C30 peripheral controller (serial and parallel ports), the WD76C20 floppy controller (also provides the RTC and NVRAM) and WD90C10 VGA. While the chipset supports more, the motherboard can only handle 2.5 MiB of RAM without modification.
     3The Sega Teradrive consists of a 286 IBM PC integrated with a Sega Megadrive. The PC side is fairly standard and is built around a Western Digital chipset found in a number of other 286 and 386 systems, including the IBM PS/55 5510Z which has some additional similarities to the Teradrive. The main components of the PC chipset are the [wiki:WD76C10LP] system controller (DRAM controller, memory map, etc.), the [wiki:WD76C30] peripheral controller (serial and parallel ports), the [wiki:WD76C20] floppy controller (also provides the RTC and NVRAM) and [wiki:WD90C10] VGA. While the chipset supports more, the motherboard can only handle 2.5 MiB of RAM without modification.
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    55The Mega Drive side is most similar to a MD1 VA3 or VA4, but has some important differences. The Z80 has 16 KiB of RAM instead of the normal 8 KiB and the VDP has 128 kiB instead of the normal 64 kiB. It has a discrete YM3438 instead of a YM2612 as found in other pre-VA7 MD1 systems. It has the same "fix" for incorrect status port reads as found in MD systems with an integrated YM3438, but implemented as discrete logic. For the 68K it has a 10MHz rated 68HC000 which runs at either the standard speed or 10MHz depending on the mode.