info-vax (03/25/83)
>From GEOFF5@SRI-CSL Fri Mar 25 06:50:06 1983
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Remailed-Date: 23 Mar 1983 1802-PST
Remailed-From: the tty of Geoffrey S. Goodfellow <Geoff5 at SRI-CSL>
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Several questions/requests:
Has anyone implemented a custom Ancillary Control Processor (ACP)?
Does anyone have information on the necessary interface with the
device and VMS?
Has anyone implemented a device driver in a higher-level language?
If so, what pitfalls must one watch out for when doing so?
Is there a (easy) way for one device driver to initiate I/O on another
driver? E.g. user issues QIO on device XXA0:; XXDRIVER then requests
I/O on device YYA0:; YYA0: completes the I/O; XXDRIVER massages the
data a little and then completes the I/O request for the user. It
might be desired to extend this chain to involve three drivers.
Any help will be much appreciated.
- Pat