Subject: RX01

From: [email-masked]
Date: Mon, 29 Nov 1993 04:09:54 GMT

In attempting to write diagnostic code and an emulator for an RX01 diskette
drive, I've come to wonder about the sanity of the entire design, particularly
with respect to the way the RX01 supports interrupts.  The interrupt at the
end of the transfer of a sector between the RX01 interface and main memory
seems to be a really useless feature, for example.

Did any RX01 software run with interrupts enabled?

					Doug Jones
					[email-masked]

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From: [email-masked] (Jeff Makey)
Date: 28 Nov 93 22:37:58 PST

In article <[email-masked]>, <[email-masked]> wrote:
>The interrupt at the
>seems to be a really useless feature

If you are writing to the disk, such an interrupt would tell you when
the memory is available for some other use.  If you are in a hurry,
this sure beats waiting until the real I/O is done.  If you are
reading from the disk, it just tells you when your data is available.

                            :: Jeff Makey

Department of Tautological Pleonasms and Superfluous Redundancies Department
    Domain: [email-masked]    UUCP: nosc!crash!jeff

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From: [email-masked] (Greg Ewing)
Date: Tue, 30 Nov 1993 01:47:52 GMT

In article <[email-masked]>, [email-masked] writes:
|> The interrupt at the
|> end of the transfer of a sector between the RX01 interface and main memory
|> seems to be a really useless feature

Not if you want to overlap processing with I/O. You start a
transfer, then go away and do something else. The interrupt
lets you know when the transfer is complete.