// .D1M/D2M/D4M - CMD FD2000/FD4000 Disk Image Format
//
// https://cbm8bit.com/8bit/commodore/server/Unrenamed%20Achives/browse/c64/d2m
// https://web.archive.org/web/20180925144409/https://cbm8bit.com/articles/user-contributions/howto_d1m_d2m_d4m
// https://ist.uwaterloo.ca/~schepers/formats/D2M-DNP.TXT
//