Z-Two, CP/M machine with Z80 emulated on ATMega

[mastmees]

As a follow-up to my DIY CP/M machine I made another one. Without the real Z80. See http://www.nomad.ee/micros/z-two/

And before anyone asks, here is a picture of it, running Zork III

[boB]

Have you ever run a speed benchmark of the emulated Z80 on the Atmel vs. say a 4 MHz Z80 processor ?

Is it twice as fast ?  10X faster ?  Slower ?

boB

[mastmees]

according to wikipedia, z80 does 0.580 MIPS at 4.000 MHz

my emulator on AVR clocked at 18.432 MHz does about 0.11-0.12  MIPS, so about 5X slower than Z80 at 4MHz.

[maginnovision]

yea, those megas lose alot of steam managing 16bit address bus alone.