19780419_Distributed_BitBlt.pdf | | Inter-Office Menlorandum
To Notetaker Working Group Date April 19, 1978
(
From Larry Tesler Location Palo Alto
Subject Distributed BitBlt Organization SSL
XEROX
Filed on: dBitBlt.press For Xerox Internal Use Only
Problem
There has been a question of whether the Notetaker I should do its BitBlts in the emulation
processor or in an I/O processor. If it is done in an I/O processor, then there can be some
overlap between emulation and character generation. If it is done in the emulation
processor, then it will be compatibie with the Notetaker II, which can do faster BitBlts in
custom LSI than Notetaker I could do on an 8086.
Alternatives
( It is possible to involve two processors in the BitBlt, one fetching the source and one storing
into the destination rectangle. The two processors would communicate over three e |