QuickBasic not only could do this, but also allowed these sources files to be compiled into executable files. One of the primary differences was that QBASIC was only an interpreter, meaning that you’d run a BASIC program by opening its source file. QBASIC stemmed off QuickBasic, a product that was sold separately. GW-BASIC could run without the ROM chip and use disk drives, which initially with Compaq gave way for IBM PC compatibles to access BASIC.īy 1991, MS-DOS 5.0 came about bringing major changes to the operating system that also included replacing GW-BASIC with QBASIC. MS-DOS versions released during the 1980s typically came with GW-BASIC, that was derived from BASICA. Licensed from Microsoft, IBM released four different variations of Microsoft BASIC for their PC and PCjr computers, one of them known as BASICA (Advanced BASIC) that relied on the ROM chip. The focus then began to shift to developing an operating system known as DOS (Disk Operating System), although an agreement was made with IBM to include BASIC onto ROM chips in their PCs throughout the decade. Microsoft found commercial success with BASIC until 1981 when the IBM PC first became available. By the end of the 1970s, additional releases had been created and distributed by cassette tape for other platforms such as those that used the MOS 6502 microprocessor. The original Altair BASIC was released on a punched tape and an agreement was made with MITS to distribute the interpreter after a successful demonstration.
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