Rise of The Personal Computer
The timesharing business started to deteriorate in mid-1982, as some key timesharing clients moved their operations from timesharing to in-house Sharp APL. Around that time, IBM started offering smaller mainframe computers, such as the IBM 4300 series, which could be leased for less than the cost of using external services. Clients who did not depend on the network were the first to migrate to small mainframes. Initially, the presence of the IBM PC posed little threat to the timesharing industry as the computing horsepower and storage capacity offered by these small machines was insufficient. As a major slice of Sharp's business was buttressed by database business, this had the beneficial effect of delaying the eventual downslide. STSC started to feel the effects of the deteriorating timesharing market one or two years earlier.
Sharp was active in the field of developing APL interpreters for the IBM PC and other computers. Their IBM PC implementation was based on a software IBM System/370 emulator, written by Roger Moore, which ran the mainframe Sharp APL executable on the PC. This product was only used by users exposed to mainframe Sharp APL, never enjoying the commercial success of STSC's APL*Plus/PC product. Sharp also offered their APL interpreter for PC-XT/370 hardware, essentially an IBM PC/XT with IBM 370 hardware emulation cards, but the PC/370 hardware never caught on. Later, Sharp released the SAX (Sharp APL for Unix) interpreter, based on STSC's APL*Plus UNX interpreter, which was a much more complete implementation of Iverson's APL extensions. SAX is available today from Soliton Incorporated.
Reuters purchased I. P. Sharp Associates in 1987, partially for the historical financial data. Ian Sharp continued as president until 1989, when he retired. In 1993, IPSA's "APL Software Division" was purchased by its employees from Reuters and renamed Soliton. Reuters closed the Toronto facility in 2005.
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