Date   : Thu, 09 Mar 2006 12:36:10 -0000
From   : "David Hunt" <dm.hunt@...>
Subject: Re: 1MHZ SCSI/ATA board.

> Andrew Benham wrote:
> 
> >> It's often amused me that the ACB4000 controlling the hard disk
> >> on my BBC Master has an 8085 microprocessor on it, and a fair
> >> amount of RAM.  So the hard disk SCSI->ST506 bridge board is
> >> probably more powerful than the BBC is...
> 
> Methinks you overrate the Power of Intel sir! Don't confuse RPM with BHP.
> 
> Check the memory access timings. Cycle for cycle, I'll take a 6502 any
> day.
> 

Yep, if IIRC the 8085 had a multiplexed address/data bus, but you could get
force up to 6MHz with a heatsink... Didn't the 8085 suffer from the same
problems as the Z80 regarding cycles per instruction, I vaguely remember the
NOP being 4 cycles vs. 2 cycles on the 6502. So even doing nothing it's half
the performance.

Dave ;)