On Thursday 07 November 2013, you wrote: > On 6 lis 2013, at 22:44, Groepaz <firstname.lastname@example.org> wrote: > >> Is there a reliable, software way of recognising ROM areas of a 1541 > >> (all models)? I mean without knowing what kind of ROM is actually > >> installed. I assume that all of them have to cover up to the end of > >> 6502 address space (if not for anything else then at least due to h/w > >> vectors) but what about the starting point(s) and what if there happen > >> to be some non-contiguous chunks? > > > > not sure if i understand the question correctly.... but to find out if > > there is rom or ram at a certain address, write to it and see if the > > value changed? (backup/restore the original value ofcourse) > > Well, finding RAM would be as easy as you wrote. What is needed though is > to distinguish ROM from all other (than ROM) types of things that may > dangle around the corners of address space. Not only RAM. Those may be RAM > but also e.g. port chips, gaps, unconnected address ranges.. it would be easier to give an advice if you'd tell what exactly you are trying to do.... i have only ever needed something like that to find out how much RAM is installed in the drive and where it is located - all other info is known anyway (like location of i/o chips). -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ftp.pokefinder.org Every programmer knows the answer: $2b or (not $2b) is $ff. Message was sent through the cbm-hackers mailing listReceived on 2013-11-07 00:00:56
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