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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