Re: PET kernal routines

There's also a pretty good memory/ROM map/cross-reference in Raeto West's 'Programming The PET CBM'; chapter 15, starting at p. 391.

http://www.bombjack.org/kim-pet/books-kim-pet.htm

m

----- Original Message ----- 
From: "Paul Schmidt" <ocleide@earthlink.net>
To: <cbm-hackers@musoftware.de>
Sent: Thursday, April 13, 2017 7:27 PM
Subject: RE: PET kernal routines


> OK, a couple small improvements: I finally found my old copy of "PET/CBM
> Personal Computer Guide (2nd Ed)" by Osborne. It has a kernel listing, which
> confirmed that $FFD2 is in fact correct for the "WRT" subroutine, but it
> listed nothing for a "CRLF" type kernel routine; so I agree with the comment
> that the other routine at $04F2 most have been part of the TIM which could
> have been loaded in in that range of addresses (the same book lists this as
> 'user memory'). 
> 
> The suggestion to re-create the CRLF by using the kernal's $FFD2 subroutine
> to send a $0D (Return) to the screen was a good one, and my tests proved
> that it works just fine. 
> 
> So I rewrote the little program to replace the JSR to $04F2 with the
> just-tested 'manual' method and it now works as expected.
> 
> Thanks to all who responded.
> 
> 
> -----Original Message-----
> From: owner-cbm-hackers@musoftware.de
> [mailto:owner-cbm-hackers@musoftware.de] On Behalf Of smf
> Sent: Thursday, April 13, 2017 1:49 PM
> To: cbm-hackers@musoftware.de
> Subject: Re: PET kernal routines
> 
> It looks like 04F2 is part of the cassette loaded TIM, while FFD2 is in the
> kernal rom.
> 
> If you don't have the routine in the version of TIM you have then something
> like this might do it:
> 
> 04F2:
> LDA #$0d
> JSR $FFD2
> RTS
> 
> You could of course put it wherever you want. You might need to call
> FFD2 with $0a as well, but I have a feeling that $0d was enough.
> 
> On 13/04/2017 14:04, Paul Schmidt wrote:
>> ogram. The Upgrade ROM
>> version of the PET memory map shows that area of memory being unused 
>> and available for RAM expansion. And it seems odd that for a 'tiny' 
>> monitor program, two of its internal routines would be so widely 
>> spaced in memory at
>> $04F2 and $FFD2.
> 
> 
>       Message was sent through the cbm-hackers mailing list
> 
> 
>       Message was sent through the cbm-hackers mailing list

       Message was sent through the cbm-hackers mailing list