I asked because in interviews I used to mention the amount of functionality I stuffed into a 'K1, which ISTR had 511 bytes of program memory. I recall that HC1

I asked because in interviews I used to mention the amount of functionality I stuffed into a 'K1, which ISTR had 511 bytes of program memory. I recall that HC11 version too! I bought the PLCC version and made my own dev board with a through hole PLCC socket :-) [edit] memory just caught up to me. The HC05K1 had 504 bytes of program memory, not 511.