Saddle factory produces the Tandy TRS-80 computer


Excerpt from The PC Pioneers

On this day in 1977, Steve Leininger started the design work for the Tandy TRS-80 computer

At Tandy, Don French, a West Coast buyer, watched Silicon Valley explode exponentially around him; he suggested its Radio Shack operation should consider entering the PC market.

French and John Roach, VP of Manufacturing, called on National Semiconductor on a ‘fishing trip’.  They met 24-year-old Steve Leininger, another Homebrew Computer Club luminary, who was developing TinyBASIC for National’s SC/MP microprocessor.

Steve_LeiningerThey tried to get Leininger’s details but National Semiconductor refused to release them.  By chance, later that evening they met him again working at a Byte Shop.  They invited him to Fort Worth where he was hired on the spot.

It was originally proposed to launch a computer kit, but Leininger was then charged with developing a complete PC system to be sold through Radio Shack in volume.  The original goal was that this should be at a $199 price point.

Leininger worked alone in an old saddle factory developing the Tandy Radio Shack personal computer, the TRS-80.  He used a Zilog Z80 microprocessor with a full-size keyboard, a monitor and a cassette deck.  At its eventual $599 price-point it represented the most expensive item in the Radio Shack inventory.

Launched in August 1977, its initial production run was 3,500, which was the number of Radio Shack and Tandy stores.  The president concluded that if the product did not sell through, then at least it would be able to run each store’s inventory.  Any fears proved groundless when 10,000 units sold in the first month!

The video monitor was not exciting; supplied as white-out-of-black and later green-out-of-black, it displayed just 16 lines of 32 or 64 characters.  The keyboard on the Model I also contained the motherboard but this had something of a bounce problem – one keystroke would deliver a multiple display of the character.

TRS-80ColorComputer2The TRS-80 could however differentiate between upper and lower-case characters in its memory, although initially lower case could not be displayed.  Later this was resolved by a $59 upgrade enabling lower-case to be shown on the monitor.  The Radio Shack TRS-80 III was launched with fully integral lower-case by 1980; by comparison it took Apple until 1983 on the Apple IIe to have a standard lower-case system.

Leininger had worked with Li-Chen Wang’s Tiny BASIC and selected it for the TRS-80.  His version had a few additional Tandy-produced input-output features and was supported by a very good manual.  Level II BASIC was later released as a Microsoft-derived version which had to be squeezed into its 12k ROM.

The TRS-80 team attracted a wealth of software, from arcade games to business applications; these included VisiCalc, a bulletin board system and the TRS-DOS operating system.

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