[ih] NCP and TCP implementations
steve at shinkuro.com
Tue Mar 10 10:23:46 PDT 2020
The TAC was an extension of the IMP. The original IMP was built on the
Honeywell 516 (and later 316) platform, which was a 16 bit twos complement
computer. I assume Hinden's reference to 15-bit arithmetic reflected the
fact that the arithmetic was signed.
On Tue, Mar 10, 2020 at 1:20 PM Leo Vegoda via Internet-history <
internet-history at elists.isoc.org> wrote:
> On Tue, Mar 10, 2020 at 9:02 AM Bob Hinden via Internet-history
> <internet-history at elists.isoc.org> wrote:
> > I later did a TCP implementation for the TAC in H-316 assembly language.
> > Was lots of fun doing 32-bit segment calculations on a machine with
> 15-bit arithmetic.
> Do you know why the designers of the TAC chose 15-bit arithmetic for it?
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> Internet-history at elists.isoc.org
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