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pkimpel / retro-b5500

Web-based emulator and operating environment for the Burroughs B5500 computer system.
http://www.phkimpel.us/B5500/
MIT License
77 stars 7 forks source link

Double-precision arithmetic needed #24

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
The double-precision arithmetic operators need to be implemented and tested.

Original issue reported on code.google.com by paul.kimpel@digm.com on 18 Nov 2013 at 2:09

GoogleCodeExporter commented 9 years ago 
DLA, DLS, DLM, and DLD implemented in release 0.20. These now appear to be 
generating results "close" to those for the modern Unisys MCP, given allowances 
for that system's much larger exponent range, use of guard digits, support for 
sub-normalized numbers, etc.

There is some question whether rounding is quite right for add/subtract, but 
it's difficult to say from the flows. Also, we have no double-precision results 
from a real B5500, so it's difficult to say from that perspective as well. I'm 
going to leave this issue open for a while, until the feature has had some more 
exposure in the field.

Original comment by paul.kimpel@digm.com on 20 Jul 2014 at 1:42

GoogleCodeExporter commented 9 years ago 
Have not seen any problems since release 0.20, so am closing this issue with 
the release of 1.00.

Original comment by paul.kimpel@digm.com on 28 Sep 2014 at 1:20