INTERSIL 6100

Domain	Definition
Computing	Intersil 6100 (IMS 6100) A single chip design of the DEC PDP-8 minicomputer. The old PDP-8 design was very strange, and if it hadn't been popular, an awkward CPU like the 6100 would never been designed. The 6100 was a 12-bit processor, which had exactly three registers - the PC, AC (an accumulator) and MQ. All 2 operand instructions read AC and MQ and wrote back to AC. It had a 12-bit address bus, limiting RAM to only 4K. Memory references were 7-bit (128 word) offset either from address 0, or the PC. It had no stack. Subroutines stored the PC in the first word of the subroutine code itself, so recursion required fancy programming. 4K RAM was pretty much hopeless for general purpose use. The 6102 support chip (included in the 6120) added 3 address lines, expanding memory to 32K the same way that the PDP-8/E expanded the PDP-8. Two registers, IFR and DFR, held the page for instructions and data respectively (IFR was always used until a data address was detected). At the top of the 4K page, the PC wrapped back to 0, so the last instruction on a page had to load a new value into the IFR if execution was to continue. (1994-11-23). Source: The Free On-line Dictionary of Computing.
Source: compiled by the editor from various references; see credits.

Anagrams: INTERSIL 6100

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "0-0-1-6-e-i-i-l-n-r-s-t"
	-4 letters: nitriles.
	-5 letters: inliers, liniest, linters, lintier, nitrile, nitrils, siltier.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.