Author Topic: Z-Two, CP/M machine with Z80 emulated on ATMega  (Read 1316 times)

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Offline mastmees

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Z-Two, CP/M machine with Z80 emulated on ATMega
« on: September 01, 2018, 11:19:39 pm »
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 :)

 

Offline boB

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Re: Z-Two, CP/M machine with Z80 emulated on ATMega
« Reply #1 on: September 01, 2018, 11:33:15 pm »

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
K7IQ
 

Offline mastmees

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Re: Z-Two, CP/M machine with Z80 emulated on ATMega
« Reply #2 on: September 01, 2018, 11:42:43 pm »
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.

 

Offline maginnovision

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Re: Z-Two, CP/M machine with Z80 emulated on ATMega
« Reply #3 on: September 11, 2018, 10:17:04 pm »
yea, those megas lose alot of steam managing 16bit address bus alone.
 


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