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- Newsgroups: comp.sys.hp48
- Path: sparky!uunet!haven.umd.edu!decuac!pa.dec.com!engage.pko.dec.com!pinbot.enet.dec.com!ervin
- From: ervin@pinbot.enet.dec.com (Joseph James Ervin)
- Subject: Re: SYSEVAL #CEEAh (disable clock)
- Message-ID: <1993Jan6.133543.24871@engage.pko.dec.com>
- Sender: newsdaemon@engage.pko.dec.com (USENET News Daemon)
- Reply-To: ervin@pinbot.enet.dec.com (Joseph James Ervin)
- Organization: Digital Equipment Corporation
- References: <2b48f1ee.2560comp.sys.hp48@hpcvbbs.cv.hp.com> <2b49df90.2560.1comp.sys.hp48.1@hpcvbbs.cv.hp.com>
- Date: Wed, 6 Jan 1993 13:35:43 GMT
- Lines: 26
-
-
- In article <2b49df90.2560.1comp.sys.hp48.1@hpcvbbs.cv.hp.com>, akcs.levenson@hpcvbbs.cv.hp.com (william j. levenson) writes:
-
- |>
- |>To disable the clock display in a program, why not use the HP supported
- |>ClrDA1IsStat at #39531h ? I haven't disassembled this and it may use the
- |>#CEEAh address but I'm not sure what that is doing either. When in
- |>doubt, I would use the HP supported entry points when possible.
- |>
- |>I hope this helps,
- |>
- |>Bill Levenson
- |>
-
-
- It depends on why you want to disable the clock. If you're programming
- in "user" or "system" RPL, then ClrDA1IsStat at #39531h should be fine.
-
- If you're like me, however, and do most of your recreational programming
- in machine language, then you're probably worried about interrupts. The
- ClrDA1IsStat word apparently only suppresses the RPL system from actually
- displaying the clock. It does not, however, actually stop the 1-second
- interrupts that are used to tell the RPL system when to advance the clock
- display.
-
- >>>Joe Ervin
-