xerox 19780508 Desk-Top NoteTaker Proposal free download

File name 19780508_Desk-Top_NoteTaker_Proposal.pdf

XEROX PALO ALTO RESEARCH CE~TER Systems Science Laboratory LSI Sysfems Area May 8, 1978 For Xerox Intcrnal usc Only To: Distribution From: Doug Fairbairn Subject: Desk - Top NoteTaker Proposal stored: [I VY]SL--tAT"I C\lct"'n1 r",nllirpc '::l l-:lra.:> (1 ,,", rl1ST"lI'::l\T ;~ ~Pti;J~~lj fl~ppy Ldi~k1L~ndL ~~jJb;~{e";ies" "Th~" p~r~Ufbl~) ~;;~Ji~~~~~~~i's ~ J;I~;l1 '(7") dispi~y: requires a mini-floppy disk, and has a significant volume set aside for batteries. The two machines might share the same power supply, however, keeping in mind that the batteries are optional. The PC boards presently envisioned for use in the portable NoteTaker are an awkward size: 5" x IT'. Th is size is not consistent with the needs of the desk -top version, and represents a manufacturing problem for either system. An additional negative aspect of these boards is that they are too large to include only one or two subsystems. Using Alto technology (MSI TTL), a new subsystem generally required 60-90 new chips. This was about the number of chips which fit on a board so that was a reasonable board size. With the level of integration proposed for the NoteTaker, each subsystem will require roughly 20-40 chips, thus making smaller boards the more logical choice. Based primarily on the modularity and manufacturability arguments above, I propose that the two systems use a common module size of approximately 8.5" x 5". Amazingly enough, th is is the same length to width ratio wh ich Xerox sta nda rds propose as the max i m LIm (1.7). This module size is the same height as the NoteTaker boards, but is half the length. The boards will have a 100 pin edge connector along the 5" side. In the current NoteTaker package, they would fit into the package as shown in Pig. l. Eight of these modules coul