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Alto II Microcode Aug75

Original Chassis:Alto II Microcode Aug75
Descr: xerox alto memos_1975 Alto_II_Microcode_Aug75.pdf
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Alto_II_Microcode_Aug75.pdfInter-Office l\'Temorand urn To Alto Users Date 19 August 1975 From C. Thacker location Palo Alto Subject Alto II Microcode Organization CSL XEROX This memo is a description of the changes which have been made in the standard Alto microcode for the second build. These changes will not affect the operation of the present software (except to make it work better in some cases), but they will make it possible to run Lisp, and make certain const.ructs simpler for those who wish to wri te special purpose microcode. The changes are: 1) A bug which sometimes caused a 1\1:44 disk to get spurious da ta late errors when the processor executed the BLT or BLKS instruction has been fixed. 2) The constant memory has been expanded. 3) Unused opcodes 61022-61037, which if executed would produce bizarre results, now trap. 4) A bug which caused unused parameterless opcodes in

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