] In addition to the recent "CPU discussion", I want to point at the AB180-20
] microprocessor made by AB-Semicon.
]
] Features:
] * Z80, Z180 compatible
] * 20MHz, 20 MIPS
] * 1MB memory, 64k I/O
] * two 16-bit timers
] * MMU
] * add. instructions: TST TSTIO MLT
]
] The AB181E-20 microprocessor has an additional fixed math accelerator.
] Anyone familiar with this CPU? Could this be a third alternative?
]
] For info (PDF): www.ab-semicon.com
This sounds like a very interesting alternative for the Z180 project:
20 MIPS at 20 MHZ: this implies only one clock cycle per instruction. Thus at
least 30 times as fast as the Z80 on MSX (which needs at least 5 clock
cycles per instruction, including the wait state in M1)
MMU: a memory management unit implies powerfull features like virtual memory,
protection of programs against each other and easy relocation of programs.
Usefull for Uzix, an enhanced version of memman and lot of other stuff.
Kind regards,
Alex Wulms
--
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