ravi@mcnc.UUCP (Ravi Subrahmanyan) (07/11/86)
I'd like to have some information on a battery backup for the internal clock in the 520 ST. I know someone posted a scheme for doing this many months back; has anyone tried anything of the sort? With success? I would appreciate hearing about any experiences anyone may have had concerning this. Please reply directly to me at the address given below, I'll summarise to the net if I get something. Thanks, -ravi [ ihnp4!mcnc!ravi ] [ decvax!mcnc!ravi ]
mugc@utecfa.UUCP (ModemUserGroupChairman) (07/13/86)
[+]
Hello All!
In response to the question about setting up a battery backup to the
ikbd (intelligent keyboard) clock:
My experience has shown that when the RESET* line is
pulled low while reseting the ST, this -ve edge
propogates to all the chips listening to the RESET* line
(the ikbd chip being one of them). This causes the
ikbd chip to reset, and in the process of going through
the reset, it sets the time to some magic date in 1985.
Is this true, or is something else changing the time.
I cut the RESET line going to the keyboard, and now
I don't lose the time across resets which seems to indicate
that this is indeed the problem. However, I don't recommend
doing this because it will void your warranty, and if there
is a better solution, your board will be marred for life :-)
Mine is so hacked beyond recognition that one more hack ...
Anees Munshi
-
Anees Munshi
@ University of Toronto Engineering Comp. Facility :A
{allegra,ihnp4,linus,decvax}!utzoo!utcsri!utecfa!mugc
{ihnp4|decvax|utzoo|utcsri}!utecfa!utecfb!munshirobt@molihp.UUCP (07/17/86)
In article <1517@alvin.mcnc.UUCP> ravi@mcnc.UUCP (Ravi Subrahmanyan) writes: > >I'd like to have some information on a battery backup for the internal >clock in the 520 ST. I know someone posted a scheme for doing this >many months back; has anyone tried anything of the sort? With >success? I would appreciate hearing about any experiences anyone may >have had concerning this. Please reply directly to me at the address >given below, I'll summarise to the net if I get something. Thanks, > I have been playing with ways to keep the time from being destroyed on my ST. I never turn my machine off, so I don't need battery backup, but I do want to get up after a reset without having to set the time again and again. A major culprit is the control panel desk accessory, which sets the date to noon, May 17, 1985 whether there is a time still valid in the keyboard clock or not. When I tried doing without the control panel, my time was fine as long as I had a calendar desk accessory on the boot disk. I assume what is happening is that the keyboard clock is undisturbed over a reboot cycle, and the desk accessory is setting the TOS time to that in the keyboard clock. When a power cycle is done, or when that calendar is not around, the time comes up as noon, Nov 20, 1985. Anyway, the control panel is 15K and doesn't work the way it should, so I was more than happy to turf it and solve the problems of not having it. One thing was that I had to write a (one line!) program to set the printer driver to expect an Epson printer for screen dumps. This preference is recorded in the desktop.inf file, but is ignored without the control panel. Curiously, the mouse and keyboard sensitivities ARE used without the control panel. To set the time, you also need a program which sets the keyboard clock time; until you power off again, your time will be fine. BTW, a followup from Anees Munshi said he cut the RESET line going to the keyboard. I *think* that line is only pulled low on power-up, and the reset is a non-maskable interrupt. That would explain why the time can survive a reboot but not a power-up with my method. # UUCP : ...!ubc_vision!molihp!robt Robert Thurlow # # My thoughts are my own, and are void where prohibited by law. # # "There was something fishy about the butler. I think he was a # # Pisces, probably working for scale." -Nick Danger, 3rd Eye #