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From: avg@rodan.UU.NET (Vadim Antonov)
Newsgroups: comp.periphs,comp.unix.bsd,comp.unix.pc-clone.32bit,comp.os.386bsd.development
Subject: Re: RFD on RTC (Real Time Clock) MC146818
Date: 30 Apr 1993 15:43:28 -0400
Organization: can take care of itself.
Lines: 43
Message-ID: <1rrvh0INN759@rodan.UU.NET>
References: <jmonroyC6A8t3.572@netcom.com>
NNTP-Posting-Host: rodan.uu.net
Keywords: RTC Real time clock
In article <jmonroyC6A8t3.572@netcom.com> jmonroy@netcom.com (Jesus Monroy Jr) writes:
> I need a precision 1Khz alarm clock for the QIC-40/80.
> A "dead loop" will not work with current hardware limitations.
> A hardware clock is needed.
Phew.
362: cd i386/isa
363: grep imeout fd.c
#define FDT_MOTORON 3 /* Motor turn-on timeout (0.5 sec) */
#define FDT_IO 10 /* I/O timeout (2 seconds) */
#define QIC_IOTIMEOUT 50 /* I/O timeout (10 seconds) */
char timo; /* Timeout */
#define FDS_TIMO 6 /* Operation has been timeouted */
#define FDS_TIMOERR 7 /* Controller finished reset after timeout */
#define FDS_TTIMO 26 /* Tape i/o timeout error */
char ackretry; /* Number of tape ACK timeouts */
* Timeout after the last operation...
* I/O timeout -- practically it means that there is no
/* Timeout */
* Process next bit timeouts
* If there is no ACK bit, timeout
timeout(fdnextbit, fd, 2);
* Timeout for the next bit expired?
* Timeout?
timeout(fdtparg, fd, 2);
timeout(fdnextbit, fd, 2); /* at least 5ms */
int ntp; /* number of pending timeouts */
timeout(fdpoll, 0, hz/5);
364:
Any questions?
> (Crowd: Yeah!)
Nah!
--vadim
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