Re: Apple IIe + ProDOS = Headache

["Bill Garber" <willy46pa@comcast DOT net>]

"David Wilson" <david@uow.edu.au> wrote in message
news:40db968f$1@news.uow.edu.au...
: Jeff Blakeney <CUTjblakeney@sympatico.ca> writes:
: >On 23 Jun 2004 07:00:39 GMT, Roger Johnstone
<rojaws@orcon.net.nz>
: >wrote:
: >>(2) ProDOS 1.3 accidentally included a 65C02 instruction in
it which
: >>could damage disks if run on a computer with a 6502 CPU.
:
: >First, thank you for posting these corrections.  It saved me
the time
: >of having to do so but in that last line you did mean:
:
: > could damage disks if run on a computer with a 65C02 CPU.
:
: >right?  :-)
:
: No, P8 v1.3 works fine on an Apple II with 65C02 CPU.
: If you run it on an unenhanced IIe or a II or II+ with
: a 6502 CPU and that bad instruction is executed the
: 6502 will NOT branch like the code expects but will
: instead fall through into disk writing code and overwrite
: data on your diskette.

Therefore it would either be advisable to update all
Apple IIs to 65C02 or eliminate ProDOS version 1.3
altogether. Better safe that sorry.  :o)

Bill @ GarberStreet Enterprizez };-)
Web Site - http://garberstreet.netfirms.com
Email - willy46pa @ comcast DOT net
Change DOT to a dot to contact me



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