Date   : Sun, 03 Jan 1999 17:40:13 +0000
From   : Mike Tomlinson <mike@...>
Subject: Re: Using PC keyboards & PC cases

In article <199901031317.OAA23303@...>, Mark Usher
<marku@...> writes

>> >- the reset switch also neatly attached
>> wire it in parallel with the Break key...
>Yes it is, directly to the two solder holes on the back of the mainboard.
>Why aren't they closer together for jumper pins.

That was initially intended for a PCB-mounted reset switch, before Acorn
decided to connect the Break key to the reset line.

>Silly me. Yes it's OK. Shame though that you still have to press a key on
>the keyboard at the same time - sort of defeats the object of a switch on
>the case. Any way to hardwire this to CTRL too ?

If you look at the PC's reset switch, you may well find it is double
pole, and so you could attach a second pair of wires to Ctrl.  Bit of a
bodge though, and means running another pair through the keyboard cable.
It's easier to type

*fx 151 78 127
<break>

which will simulate a power-on reset.  In a utility ROM I wrote I
included a command, *Xreset, which just did a *fx 151 78 127 followed by
a jmp (&fffc).  Very handy.

-- 
Mike Tomlinson
See the sci.electronics.repair FAQ mirror at  
http://www.jasper.demon.co.uk/repairfaq/