Xerox Alto I Hardware Manual page 80

Alto Hardware Manual
APPENDIX G - SUMMARY OF KNOWN FEATURESIBUGS·
IN RELEASED MICROCODE VERSIONS
Alto I version 23:
VERS
instruction:
BITBLT
instruction:
Alto II version 2:
VERS
instruction:
BITBLT
instruction:
RDRAM
instruction:
DEXCH
instruction:
SIT
instruction:
ACSOURCE
function:
Alto I version 24:
No known bugs.
Alto II version 3:
SIT
instruction:
returns engineering number 0, microcode version 1.
doesn't work reliably if some ram-related task is running
(e.g., the Trident disk).
returns engineering number 2, microcode version O.
doesn't work reliably if some ram-related task is running
(e.g., the Trident disk). Expects L to be zeroed by the
caller.
does not work. reliably when the Ethernet interface is
active.
does not work at all.
TIMEMASK
is 7700B but should be 7774B. Fails to store
into
ITQUAN.
does not work precisely as documented.
McCreight if you really need to know.
Fails to store into
ITQUAN.
Consult
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