🚀 go-pugleaf

RetroBBS NetNews Server

Inspired by RockSolid Light RIP Retro Guy

Article View: sci.electronics
Article #11806

Re: microcontrollers

#11806
From: Jim Cathey
Date: Thu, 12 Nov 1992 18:52
26 lines
1633 bytes
In article <11NOV199219370593@rigel.tamu.edu> rahhelp@rigel.tamu.edu (Ronald A. Huizar) writes:
>planning to use the MC68HC811E2 can only address about 64K of external 
>...
>about 3 Meg of memeory. To much for the E2. So I know that the 

Ever heard of bank-switching?  Your massive data needs can be easily
handled this way, because you don't need simultaneous access to all
that data.  Your application is specific (and simple) enough that you
can afford to call a subroutine to fetch each sample from RAM that's
not directly in your address space.  No problem.  A similar technique was
used in many external print spoolers, which had 8048's in them.  These
only can directly address something like 2K of memory (my memory's
fading fast), but these used clever bit-banging techniques on DRAMs
connected to I/O ports to store hundreds of K of data.

Engineering Rule #3b:  Work smart, not hard.

-- 
+----------------+
! II      CCCCCC !  Jim Cathey
! II  SSSSCC     !  ISC-Bunker Ramo
! II      CC     !  TAF-C8;  Spokane, WA  99220
! IISSSS  CC     !  UUCP: uunet!isc-br!jimc (jimc@isc-br.isc-br.com)
! II      CCCCCC !  (509) 927-5757
+----------------+
			"PC's --- the junk bonds of the computer industry"
Technical Details
Message-ID: <2820@tau-ceti.isc-br.com>
Path: arc1-ca.pugleaf.net!sparky!uunet!gossip.pyramid.com!olivea!isc-br!tau-ceti!jimc
References: <11NOV199219370593@rigel.tamu.edu>

Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!sparky!uunet!gossip.pyramid.com!olivea!isc-br!tau-ceti!jimc
From: jimc@tau-ceti.isc-br.com (Jim Cathey)
Newsgroups: sci.electronics
Subject: Re: microcontrollers
Keywords: sizes? External Memory Capability
Message-ID: <2820@tau-ceti.isc-br.com>
Date: 12 Nov 92 18:52:15 GMT
References: <11NOV199219370593@rigel.tamu.edu>
Organization: ISC - Bunker Ramo, Spokane, WA
Lines: 26