A little more, based on calls to $ffd2: At $90f8, it prints out "{Return}OFF{Return}" At $95d7, it prints out a given text within quotes Around $9a43, it prints out bytes from the block around $9af7, but in a convoluted way. Probably need to test-run that code to see what it does. /Hans On 2019-06-01 00:15, Hans Liss wrote: > I started disassembling it and found very little. Not knowing enough > about the PET is a bit of a problem. :) > > Still, there's code at $95fd that resembles a simple one-letter command > handler for commands like 'A', 'D', 'O', 'T', 'S', 'R', 'H','V','M','N'. > > Also, at $92a4, there's a string containing 'CLR<Return>', which is > loaded by a routine at $9280 and used for who knows what, possibly > pushed onto an input queue or something like that. > > I thought it might be a machine code monitor but I haven't found any ROM > images online that resemble this one - not even a little. > > /Hans > > On 2019-05-31 15:38, Francesco Messineo wrote: >> Hi all, >> I'm repairing a 2001N-32 that has Basic 4.0 upgrade (all EPROMs >> instead of ROMs). >> I've also found an additional ROM in the $9000 socket, the only string >> that seems to be in the image is "BASIC 4.5". I've attached the ROM >> dump, does anyone know what it is and how to activate it? >> Thanks
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