Article View: comp.sys.ibm.pc
Article #15111Need help with Hayes 1200B software reset.
From: Jay F. Rosenberg
Date: Sat, 10 Jan 1987 21:52
Date: Sat, 10 Jan 1987 21:52
25 lines
1830 bytes
1830 bytes
According to the documentation, it's supposed to be possible to get
the reset effect of a cold reboot (turning the machine off and on) for the
Hayes 1200B board modem by doing appropriate writes to Bit 2 of the UART's
Modem Control Register. I've tried to implement this using Debug and
various Turbo Pascal routines, but failed miserably every time.
Could anyone point me in the direction of a piece of software which
actually implements this documented function, or tell me how to write my
own? Here's what the Haye's 1200B manual says:
"To perform a processor reset, equivalent to power off/power on,
write to bit 2 of the UART's Modem Control Register (see Chapter 4). Write
a 1, wait at least 50 ms, then write a 0 to OUT 1."
And in Chapter 4:
"Modem Control Register (MCR) 3FC r/w ...
Bit 2: Output 1 (OUT 1): 1 Resets the modem; equivalent to power
off/power on.... Must be held at 1 for at least 50 ms.
0 Setting for normal operation. After
executing a reset, write a 0 to this bit to clear it."
Any and all help would be deeply appreciated!
--
JAY ROSENBERG Dept. of Philosophy UNC Chapel Hill, NC 27514
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!mcnc!ecsvax!unbent From: unbent@ecsvax.UUCP (Jay F. Rosenberg) Newsgroups: comp.sys.ibm.pc Subject: Need help with Hayes 1200B software reset. Message-ID: <2541@ecsvax.UUCP> Date: Sat, 10-Jan-87 16:52:16 EST Article-I.D.: ecsvax.2541 Posted: Sat Jan 10 16:52:16 1987 Date-Received: Sat, 10-Jan-87 23:40:56 EST Distribution: na Organization: UNC Chapel Hill Lines: 25 Keywords: hayes 1200b modem uart reset