320:. The chip set could be extended with the CROM chip (IMP-16A / 522D) that implemented 16-bit multiply and divide routines. The chipset was driven by a two-phase 715 kHz non-overlapping clock that had a +5 to -12 voltage swing. An integral part of the architecture was a 16-bit input mux that provided various condition bits from the ALUs such as zero, carry, overflow along with general purpose inputs.
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Each RALU chip stores its own 4 bits of the program counter, several registers, the ALU, a 16-word LIFO stack, and status flags. There were four 16-bit accumulators, two of which could be used as index registers. The
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single-chip 16-bit microprocessors, which had a similar architecture but were not binary compatible. It was also used in the
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slice of the register and arithmetic that work in parallel to produce a 16-bit word length.
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339:, thanks to National Semiconductor's chairman Peter Sprague being a major shareholder in
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421:"IMP-16C/200 IMP-16C/300 Microprocessors, IMP-16P Microcomputer Product Descriptions"
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J100 but saw little other use. The IMP-16 was later superseded by the
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372:"IMP-00A/520 MOS/LSI register and arithmetic logic unit (RALU)"
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The microprocessor was used in the IMP-16P microcomputer and
292:, providing the data path, and one CROM, Control and
483:IMP-16C board at the Selectric Typewriter Museum
468:https://sprague.com/peter-sprague/aston-martin/
439:"Jacquard Systems Starts Small But Thinks Big"
8:
392:"IMP-16 Programming and Assembler Manual"
277:, released in 1973. It consisted of five
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284:: four identical RALU chips, short for
498:National Semiconductor microprocessors
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7:
437:Surdan, Esther (November 21, 1977).
296:, providing control sequencing and
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508:Computers using bit-slice designs
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314:instruction set architecture
304:; each RALU chip provides a
316:was similar to that of the
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186:Status Flags Register (FR)
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300:storage. The IMP-16 is a
401:. National Semiconductor
503:16-bit microprocessors
268:National Semiconductor
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337:Aston Martin Lagonda
360:"Use of RALU flags"
302:bit-slice processor
282:integrated circuits
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377:2016-03-04 at the
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325:Jacquard Systems'
318:Data General Nova
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17:IMP-16 registers
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164:Program Counter
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477:External links
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403:. Retrieved
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132:Accumulator
124:Accumulator
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405:26 December
492:Categories
453:3 November
347:References
399:bitsavers
298:microcode
148:Acc/Base
140:Acc/Base
449:(47): 66
375:Archived
286:register
426:. 1974.
333:INS8900
258:IMP 16A
244:Status
381:. p. 1
272:16-bit
264:IMP-16
424:(PDF)
395:(PDF)
306:4-bit
266:, by
170:Stack
455:2022
407:2021
331:and
329:PACE
288:and
279:PMOS
262:The
177:STK
145:AC3
137:AC2
129:AC1
121:AC0
294:ROM
290:ALU
241:GF
238:GF
235:GF
232:GF
229:GF
226:GF
223:GF
220:GF
217:GF
214:GF
211:GF
208:GF
205:GF
161:PC
494::
447:XI
445:.
441:.
397:.
201:CY
196:OV
192:L
457:.
409:.
362:.
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52:0
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27:5
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