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7854: Difference between revisions
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and the digital processing was called the "smarts". | and the digital processing was called the "smarts". | ||
The waveform processor can be programmed using a detachable calculator-style keyboard, using postfix operators | The waveform processor can be programmed using a detachable calculator-style keyboard, using postfix operators ("[[wikipedia:Reverse Polish notation|reverse Polish notation]]" like [[wikipedia:HP-35|HP calculators]]) that operate on entire waveforms, not just individual numbers. | ||
("reverse Polish notation" like HP calculators) that operate on entire waveforms, not just individual numbers. | |||
{{BeginSpecs}} | {{BeginSpecs}} | ||
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The acquisition system uses what Tektronix termed a "display-oriented random sampling digitizing technique". | The acquisition system uses what Tektronix termed a "display-oriented random sampling digitizing technique". | ||
It simultaneously digitizes a pair of X and Y signal values at a rate of 3.5 µs/point, using | It simultaneously digitizes a pair of X and Y signal values at a rate of 3.5 µs/point, using sample/hold circuits based on Schottky diode bridges, and a single 10-bit successive-approximation ADC. The Y sample value is then written into the memory location addressed by the X value, using DMA (direct memory access, i.e. bypassing the CPU). | ||
The Y sample value is then written into the memory location addressed by the X value, using DMA. | |||
The CPU in the 7854 is a [[Texas Instruments TMS9900]] 16-bit microprocessor, known from the infamous TI-99/4 home computer of the late 70s, with 32+6KByte ROM and 8KByte RAM. | The CPU in the 7854 is a [[Texas Instruments TMS9900]] 16-bit microprocessor, known from the infamous TI-99/4 home computer of the late 70s, with 32+6KByte ROM and 8KByte RAM. | ||