Re: testting 6509

From: Michał Pleban <>
Date: Tue, 10 Jan 2017 16:20:15 +0100
Message-ID: <>

Didier Derny wrote:

> is there any way to test a 6509 in place of a 6502  to test it  ?
> (with a simple adaptator board)

The 6509 is missing some signals that the 6502 has. It also reserves
memory locations $00 and $01 for memory segment management. If your
application/device is using these signals or memory locations, 6509 will
not work as a drop replacement for 6502. Otherwise, if you ignore the
A16-A19 lines, it should be compatible.


       Message was sent through the cbm-hackers mailing list
Received on 2017-01-10 16:00:03

Archive generated by hypermail 2.2.0.