Date: Sun, 30 Nov 1997 20:03:33 GMT From: jak@cetlink.net (John Kelly) To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: hackers@FreeBSD.ORG Subject: Re: 650 UART, SIO driver, 8259 PIC Message-ID: <3482bd16.18797696@mail.cetlink.net> In-Reply-To: <19971130002133.00410@hydrogen.nike.efn.org> References: <199711292017.HAA16179@godzilla.zeta.org.au> <348095b5.441871@mail.cetlink.net> <19971130002133.00410@hydrogen.nike.efn.org>
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On Sun, 30 Nov 1997 00:21:33 -0800, John-Mark Gurney <gurney_j@efn.org> wrote: >I've thought about upgrading sio so that it would understand the >existance of it, but there were a number of problems... the status >register is stored in the scratch register of the fourth port of the >board... also, on the AST/4 the port to write to, to clear ALL the >interrupts When you say "to clear ALL the interrupts," are you talking about an AST-style control register? My board only has a status register, so I don't understand the notion of clearing interrupts by writing to a port. Can you explain the use of an AST-style control register? John
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