From: cis.ohio-state.edu!news.sei.cmu.edu!ajpo.sei.cmu.edu!falis@ucbvax.Berkele y.EDU (Edward Falis)
Subject: Re: serial port, console IO
Date: 29 Oct 92 16:36:31 GMT [thread overview]
Message-ID: <1992Oct29.163631.7542@sei.cmu.edu> (raw)
The first param is used to determine the interrupt vector containing
the address of the isr for incoming serial port interrupts. It's
an actual subprogram parameter. If you look at the argument routine
given, you'll see that it's an interfaced routine whose body is
defined in the user bsp (uscodxxx.asm).
Similarly, the second parameter you mention another actual suprogram
parameter for a routine to put a single byte to the serial device.
This interfaces into a routine that is also in the user BSP (in
the instantiation given).
- Ed Falis, Alsys Inc
next reply other threads:[~1992-10-29 16:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1992-10-29 16:36 cis.ohio-state.edu!news.sei.cmu.edu!ajpo.sei.cmu.edu!falis [this message]
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1992-10-28 21:25 serial port, console IO Robert I. Eachus
1992-10-28 16:12 cis.ohio-state.edu!pacific.mps.ohio-state.edu!zaphod.mps.ohio-state.edu!u
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