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- OCLOCK -- a simple clock counter for the Osborne 1 page 1
-
-
- Copyright 1982 Michael M Rubenstein
-
- This document and the accompanying program may be
- distributed freely provided the copyright notice is
- retained and no fee is charged.
-
- OCLOCK implements a simple counting clock on the
- Osborne 1. The clock consists of two bytes at
- location 000BH. Once the command
-
- oclock
-
- is executed, this location will be incremented every
- 1/60 second until the system is cold booted or the
- command
-
- oclock off
-
- is executed. The clock's accuracy is limited by the
- operating system disabling interrupts for disk i/o.
- Errors of 5-10% are typical during normal activity.
-
- OCLOCK uses one page in high memory. However, since
- it locks the ccp into memory, the net effect is to
- reduce the tpa by 2.25k.
-
- OCLOCK may be used with the Software Toolworks C/80
- compiler cprof program to give an execution profile
- of a c program. Make sure TICCNT is defined as 11
- in cprof (it is distributed that way, but may have
- been modified for no clock). Follow the Software
- Toolworks C/80 instructions for use of cprof with
- either AS or M80.
-
- There is a bug in cprof which causes the profile to
- omit some functions from the display, but not from
- the total time. In particular, if exit is called,
- the main function will not be displayed in the
- profile. This bug can be fixed by inserting the
- line
-
- if (!q[-1]) q[-1] = 1;
- after the line
-
- for (q = LINKPT; q != -1; q = q[-3]) {
-
- in cprof.c. If this patch is made, the number of
- calls displayed in the profile will be the number of
- returns that the function made, except that func-
- tions which had never executed a return when exit
- was called will have a count of one.
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