Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!cmcl2!rutgers!labrea!decwrl!pyramid!voder!wlbr!pete From: pete@wlbr.EATON.COM (Pete Lyall) Newsgroups: comp.sys.m6809 Subject: Re: 512K RAM upgrades Message-ID: <1111@wlbr.EATON.COM> Date: Wed, 31-Dec-69 18:59:59 EDT Article-I.D.: wlbr.1111 Posted: Wed Dec 31 18:59:59 1969 Date-Received: Tue, 11-Aug-87 05:28:39 EDT References: <5013@milano.UUCP> <1107@wlbr.EATON.COM> <5034@milano.UUCP> <1109@wlbr.EATON.COM> <1585@tekgen.TEK.COM> Reply-To: pete@wlbr.UUCP (0000-Pete Lyall) Organization: Eaton IMS, Westlake Village, CA Lines: 25 Keywords: OS9 CACHE SDOS In article <1585@tekgen.TEK.COM> jonh@tekgen.UUCP (Jon Howell) writes: > >You're right, Pete--we'd LOVE that cache! Also, that nice effect of open key- >board during disk access. Also, does that mean the chars show on the screen, >or are just read? Keyboard 'lockout' is ususally caused by the way the floppy controller is set up and used. As delivered, the standard RS controller (and most of the clones) are programmed to actually HALT the 6809 during data xfer.. the only thing that gets the 6809 out of the loop is a NMI (non-maskable interrupt), if I recall correctly. Most hard disk and ramdisk drivers don't suffer from this malady, which is to say that you get full typoe ahead (up to the limits of your terminal driver's input buffer). Also, the echoing is handled by SCF, so you won't see the characters echoed until an I$read or I$readln is done... actually this is quite nice.. it shows you the characters as it uses them, not all at once (when you type them). -- Pete Lyall Usenet: {trwrb, scgvaxd, ihnp4, voder, vortex}!wlbr!pete Compuserve: 76703,4230 (OS9 Sysop) OS9 (home): (805)-985-0632 (24hr./1200 baud)