Date: Mon, 19 Jan 1998 02:23:48 -0800 From: John-Mark Gurney <gurney_j@efn.org> To: shmit@erols.com Cc: Mike Smith <mike@smith.net.au>, Randall Hopper <rhh@ct.picker.com>, emulation@FreeBSD.ORG Subject: Re: DOSCMD: Problems w/ Quicken Message-ID: <19980119022348.44312@hydrogen.nike.efn.org> In-Reply-To: <19980119051304.06795@erols.com>; from Brian Cully on Mon, Jan 19, 1998 at 05:13:04AM -0500 References: <19980118192319.02894@ct.picker.com> <199801190321.NAA00804@word.smith.net.au> <19980119051304.06795@erols.com>
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Brian Cully scribbled this message on Jan 19: > On %M %N, Mike Smith wrote: > > Yecch. If it's actually trying to do what the above claims, it's > > making quite a mess. (0040:0000 is in seriously low memory, but > > 0040:ffff doesn't make any sense at all). > > Hrm... now it's been a while since I've done DOS assembler, so this > maybe incorrect, but IIRC, 0x40 is the keyboard segment. the 0x40 is the bios segment.. it really looks like a miscalculation of some sort... > 0x40:0x0 is the head of the keyboard buffer nope, this is com1's base address... > 0x40:0x2 is the tail this is com2's base address... 0x40:1a is the head pointer, and 0x40:1c is the tail pointer for the keyboard... > and the next 16 bytes is the ring-buffer. actually 0x40:0x1e through 0x40:0x3d is the keyboard buffer (32bytes total) > So I have no idea what 0xffff would be, except perhaps a miscalculation. > Although, you may be able to expand the size of the keyboard buffer, and > the tail could have ended up there... P.S. Information from The Programmer's PC Source Book (second edition).. pretty much a printed Ralph Brown's Interrupt list, but from 1991... (it also lacks a lot of the detail Brown's list has, but still useful) -- John-Mark Gurney Modem/FAX: +1 541 683 6954 Cu Networking P.O. Box 5693, 97405 Live in Peace, destroy Micro$oft, support free software, run FreeBSD
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