Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!philabs!seismo!hao!hplabs!sri-unix!MCMANIS@usc-eclc From: MCMANIS@usc-eclc@sri-unix.UUCP Newsgroups: net.micro Subject: RE: Vectrex Message-ID: <12091@sri-arpa.UUCP> Date: Tue, 27-Sep-83 15:08:00 EDT Article-I.D.: sri-arpa.12091 Posted: Tue Sep 27 15:08:00 1983 Date-Received: Sun, 2-Oct-83 01:24:59 EDT Lines: 16 From: Chuck McManis I remember an article in the recent past (ie <12 months ago ) about a vector interface that used a slave Z-80 to drive it but was essentially the same circuit vectrex uses but with more hardware. This means 2 DAC's and 3 8 bit latches to free up sample and holds, and it did not need recalibrating. Drawbacks were a fixed draw time, so that short vectors were brighter than long ones but not terribly so. A nearly identical circuit is attributed to Steve Ciarcia in the Scelbi/Byte Primer. These have the advantage that they can produce more vectors with less flicker due to the reduced overhead. If you drove them with a 6809 I am sure the # could be increased further. --Chuck -------