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Commodore DOS
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<p>Commodore DOS, also known as CBM DOS, is the <a href="/facts/Disk_operating_system/Kc28g5MR">disk operating system</a> used with <a href="/facts/Commodore_International/SlfXKbCN">Commodore</a>'s <a href="/facts/Commodore_International/SlfXKbCN">8-bit computers</a>. Unlike most other <a href="/facts/Disk_operating_system/Kc28g5MR">DOSes</a>, which are loaded from disk into the computer's own <a href="/facts/Random-access_memory/DuD4bxh6">RAM</a> and executed there, CBM DOS is executed internally in the drive: the DOS resides in <a href="/facts/Read-only_memory/P9QMuDLH">ROM</a> chips inside the drive, and is run there by one or more dedicated <a href="/facts/MOS_Technology_6502/q9YLwkzm">MOS 6502</a> family <a href="/facts/Central_processing_unit/Jxp1bqMV">CPUs</a>. Thus, data transfer between Commodore 8-bit computers and their disk drives more closely resembles a <a href="/facts/Local_area_network/edUDxJ6J">local area network</a> connection than typical disk/host transfers. </p>