6502, 6510 tri-state

From: silverdr_at_wfmh.org.pl
Date: Fri, 30 Nov 2018 00:48:17 +0100
Message-Id: <09D8048E-3D82-4701-A234-47055F6304FE@wfmh.org.pl>
I've got a question I can't answer out of my head and can't currently set any test bench for - how does the 6502 and 6510 behave when it comes to getting off the bus. I know we can make 6510 off the address bus with the additional line that is not available in 6502 but the question is: does any of the two (especially 6510, which surely has the ability) get off the bus by itself like during other phase of the clock cycle?

IOW - if put into a tight loop like:

1000 - JMP $1000

will all the address lines (except the two lowest ones, obviously) remain unchanged and continuously driven by the CPU? Or will those only be driven during active clock phase?

-- 
SD! - http://e4aws.silverdr.com/
Received on 2018-11-30 01:00:02

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