Microsoft aboriginal licensed, again purchased 86-DOS from Seattle Computer Products (SCP), which was adapted for the IBM PC by Microsoft agent Bob O'Rear with abetment from SCP (later Microsoft) agent Tim Paterson. O'Rear got 86-DOS to run on the ancestor PC in February 1981. 86-DOS had to be adapted from 8-inch to 5.25-inch billowing disks and chip with the BIOS, which Microsoft was allowance IBM to write.2 IBM had added bodies autograph requirements for the computer than Microsoft had autograph code. O'Rear generally acquainted afflicted by the cardinal of bodies he had to accord with at the ESD (Entry Systems Division) ability in Boca Raton. 86-DOS was rebranded IBM PC DOS 1.0 for its August 1981 absolution with the IBM PC.
DOS 1.00
The antecedent adaptation of DOS was abundantly based on CP/M and abounding of its action calls as able-bodied as the book arrangement were affected anon from the earlier OS. Unlike all after DOS versions, the DATE and TIME commands were abstracted executables rather than allotment of COMMAND.COM. Single-sided 160k 5.25" floppies were the alone deejay architecture supported.
Toward the end of 1981, Paterson went to assignment on an upgrade, which was alleged PC DOS 1.10. It debuted in May 1982 forth with the Revision B IBM PC. Support for the fresh double-sided drives was added, acceptance 320k per disk. A cardinal of bugs were fixed, and absurdity letters and prompts were fabricated beneath cryptic. The DEBUG apparatus accent adviser account was now able to amount files greater than 64k in size.
DOS 1.00
The antecedent adaptation of DOS was abundantly based on CP/M and abounding of its action calls as able-bodied as the book arrangement were affected anon from the earlier OS. Unlike all after DOS versions, the DATE and TIME commands were abstracted executables rather than allotment of COMMAND.COM. Single-sided 160k 5.25" floppies were the alone deejay architecture supported.
Toward the end of 1981, Paterson went to assignment on an upgrade, which was alleged PC DOS 1.10. It debuted in May 1982 forth with the Revision B IBM PC. Support for the fresh double-sided drives was added, acceptance 320k per disk. A cardinal of bugs were fixed, and absurdity letters and prompts were fabricated beneath cryptic. The DEBUG apparatus accent adviser account was now able to amount files greater than 64k in size.
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