novaBBS - comp.sys.apple2 - Detect key at startup

Detect key at startup

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Subject: Detect key at startup
From: anthonyp...@gmail.com (Anthony Ortiz)
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by: Anthony Ortiz - Wed, 13 Jul 2022 21:36 UTC

Question for you guys... I made my own peripheral card a while back and I want to enable it only if you hold down the SHIFT key during ctrl-openapple-reset. What would you say is the best way to achieve this?

Re: Detect key at startup

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Subject: Re: Detect key at startup
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by: I am Rob - Thu, 14 Jul 2022 13:06 UTC

Maybe look into the ProDOS that comes with booting GSOS. It has the ability that when you boot into GSOS, you can hold down the the #8 key and it will boot into ProDOS 8 instead.

Re: Detect key at startup

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Subject: Re: Detect key at startup
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From: mjma...@aol.com (Michael J. Mahon)
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by: Michael J. Mahon - Thu, 14 Jul 2022 23:17 UTC

Anthony Ortiz <anthonypaulo@gmail.com> wrote:
> Question for you guys... I made my own peripheral card a while back and I
> want to enable it only if you hold down the SHIFT key during
> ctrl-openapple-reset. What would you say is the best way to achieve this?
>

There are only two ways to detect that the shift key is depressed: 1)
testing the pushbutton input for the “shift key mod” (if it’s installed,
and if its corresponding pushbutton is *not* pressed), or 2) finding the
keyboard port with an ASCII code which is a “shifted” character.

Since Ctl-Open Apple-Reset does not generate any keycode at the keyboard
port, 2) is not useful. So any detection of shift key depression can only
be detected if the shift key mod is present and the corresponding
pushbutton does not interfere.

You may want to consider using a keycode-generating key, as ProDOS does.

--
-michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com

Re: Detect key at startup

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Subject: Re: Detect key at startup
From: anthonyp...@gmail.com (Anthony Ortiz)
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by: Anthony Ortiz - Fri, 15 Jul 2022 01:13 UTC

On Thursday, July 14, 2022 at 7:17:18 PM UTC-4, Michael J. Mahon wrote:
> > Question for you guys... I made my own peripheral card a while back and I
> > want to enable it only if you hold down the SHIFT key during
> > ctrl-openapple-reset. What would you say is the best way to achieve this?
> >
> There are only two ways to detect that the shift key is depressed: 1)
> testing the pushbutton input for the “shift key mod” (if it’s installed,
> and if its corresponding pushbutton is *not* pressed), or 2) finding the
> keyboard port with an ASCII code which is a “shifted” character.
>
> Since Ctl-Open Apple-Reset does not generate any keycode at the keyboard
> port, 2) is not useful. So any detection of shift key depression can only
> be detected if the shift key mod is present and the corresponding
> pushbutton does not interfere.
>
> You may want to consider using a keycode-generating key, as ProDOS does.
>
> --
> -michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com

Hello Michael!

Okay I get it... so If I were to have my peripheral card listen to the RESET line and immediately check $C000 for the keycode-generating key of choice, then this would cover my scenario of detecting a keypress during startup right? Or is the RESET line by itself not enough to determine ctrl-apple-reset occurred?

Re: Detect key at startup

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Subject: Re: Detect key at startup
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by: Brian Patrie - Fri, 15 Jul 2022 08:36 UTC

Anthony Ortiz wrote:
> On Thursday, July 14, 2022 at 7:17:18 PM UTC-4, Michael J. Mahon wrote:
>>> Question for you guys... I made my own peripheral card a while back and I
>>> want to enable it only if you hold down the SHIFT key during
>>> ctrl-openapple-reset. What would you say is the best way to achieve this?
>>>
>> There are only two ways to detect that the shift key is depressed: 1)
>> testing the pushbutton input for the “shift key mod” (if it’s installed,
>> and if its corresponding pushbutton is *not* pressed), or 2) finding the
>> keyboard port with an ASCII code which is a “shifted” character.
>>
>> Since Ctl-Open Apple-Reset does not generate any keycode at the keyboard
>> port, 2) is not useful. So any detection of shift key depression can only
>> be detected if the shift key mod is present and the corresponding
>> pushbutton does not interfere.
>>
>> You may want to consider using a keycode-generating key, as ProDOS does.
>>
>> --
>> -michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com
>
> Hello Michael!
>
> Okay I get it... so If I were to have my peripheral card listen to the RESET line and immediately check $C000 for the keycode-generating key of choice, then this would cover my scenario of detecting a keypress during startup right? Or is the RESET line by itself not enough to determine ctrl-apple-reset occurred?

The RESET line tells you that ctrl-reset is being held (or that the
auto-reset circuit is doing its thing during powerup). You'd have to
check for open-apple (bit 7 of $C061) separately. Mind you, execution
does not occur /during/ RESET.

What do you mean by "enable" the card? Does it take over the system in
some way (e.g. a ROM card)? Or is it a boot device that you want to be
skipped, or something, if the requisite key is not being held?

Re: Detect key at startup

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From: keg...@provalid.com (Kent Dickey)
Newsgroups: comp.sys.apple2
Subject: Re: Detect key at startup
Date: Fri, 15 Jul 2022 12:34:25 -0000 (UTC)
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by: Kent Dickey - Fri, 15 Jul 2022 12:34 UTC

In article <fb8206ee-6d93-4423-a0dc-03fb41874041n@googlegroups.com>,
Anthony Ortiz <anthonypaulo@gmail.com> wrote:
>On Thursday, July 14, 2022 at 7:17:18 PM UTC-4, Michael J. Mahon wrote:
>> > Question for you guys... I made my own peripheral card a while back and I
>> > want to enable it only if you hold down the SHIFT key during
>> > ctrl-openapple-reset. What would you say is the best way to achieve this?
>> >
>> There are only two ways to detect that the shift key is depressed: 1)
>> testing the pushbutton input for the “shift key mod” (if it’s
>installed,
>> and if its corresponding pushbutton is *not* pressed), or 2) finding the
>> keyboard port with an ASCII code which is a “shifted” character.
>>
>> Since Ctl-Open Apple-Reset does not generate any keycode at the keyboard
>> port, 2) is not useful. So any detection of shift key depression can only
>> be detected if the shift key mod is present and the corresponding
>> pushbutton does not interfere.
>>
>> You may want to consider using a keycode-generating key, as ProDOS does.
>>
>> --
>> -michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com
>
>Hello Michael!
>
>Okay I get it... so If I were to have my peripheral card listen to the
>RESET line and immediately check $C000 for the keycode-generating key of
>choice, then this would cover my scenario of detecting a keypress during
>startup right? Or is the RESET line by itself not enough to determine
>ctrl-apple-reset occurred?

i'm not sure you can use a regular key either. I suspect the Reset will
clear the keyboard latch. On a //e or later (so, with open-apple keys),
you may still be able to read $C010 and see if "any" key is down, but
Reset might clear that too. The Open-Apple/Closed-Apple keys aren't
normal keys--they are read like paddle buttons, so reset doesn't affect
them.

Kent

Re: Detect key at startup

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Subject: Re: Detect key at startup
From: anthonyp...@gmail.com (Anthony Ortiz)
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by: Anthony Ortiz - Fri, 15 Jul 2022 14:21 UTC

On Friday, July 15, 2022 at 8:34:27 AM UTC-4, Kent Dickey wrote:
> >On Thursday, July 14, 2022 at 7:17:18 PM UTC-4, Michael J. Mahon wrote:
> >> > Question for you guys... I made my own peripheral card a while back and I
> >> > want to enable it only if you hold down the SHIFT key during
> >> > ctrl-openapple-reset. What would you say is the best way to achieve this?
> >> >
> >> There are only two ways to detect that the shift key is depressed: 1)
> >> testing the pushbutton input for the “shift key mod” (if it’s
> >installed,
> >> and if its corresponding pushbutton is *not* pressed), or 2) finding the
> >> keyboard port with an ASCII code which is a “shifted” character.
> >>
> >> Since Ctl-Open Apple-Reset does not generate any keycode at the keyboard
> >> port, 2) is not useful. So any detection of shift key depression can only
> >> be detected if the shift key mod is present and the corresponding
> >> pushbutton does not interfere.
> >>
> >> You may want to consider using a keycode-generating key, as ProDOS does.
> >>
> >> --
> >> -michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com
> >
> >Hello Michael!
> >
> >Okay I get it... so If I were to have my peripheral card listen to the
> >RESET line and immediately check $C000 for the keycode-generating key of
> >choice, then this would cover my scenario of detecting a keypress during
> >startup right? Or is the RESET line by itself not enough to determine
> >ctrl-apple-reset occurred?
> i'm not sure you can use a regular key either. I suspect the Reset will
> clear the keyboard latch. On a //e or later (so, with open-apple keys),
> you may still be able to read $C010 and see if "any" key is down, but
> Reset might clear that too. The Open-Apple/Closed-Apple keys aren't
> normal keys--they are read like paddle buttons, so reset doesn't affect
> them.
>
> Kent

Hi Kent!

My peripheral card acts as an accelerator (a faster 6502) so what I would like to do is make it so that the card is enabled (Ie. acceleration is enabled) whenever an extra key is detected during reboot.

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by: Anthony Ortiz - Fri, 15 Jul 2022 14:27 UTC

Hey guys,

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Subject: Re: Detect key at startup
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From: mjma...@aol.com (Michael J. Mahon)
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by: Michael J. Mahon - Sat, 16 Jul 2022 22:07 UTC

Anthony Ortiz <anthonypaulo@gmail.com> wrote:
> Hey guys,
>
> My peripheral card acts as an accelerator (a faster 6502) so what I would
> like to do is make it so that the card is enabled (Ie. acceleration is
> enabled) whenever an extra key is detected during reboot.

Since Reset must be assumed to reset the keyboard port along with the rest
of the system, I suggest polling for a (code-generating) keypress within a
short window (say, two seconds) *after* Reset. If the key is pressed during
the window, clear the strobe (to “consume” the keypress) and then enable
your card.

--
-michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com

Re: Detect key at startup

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Subject: Re: Detect key at startup
From: anthonyp...@gmail.com (Anthony Ortiz)
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by: Anthony Ortiz - Tue, 19 Jul 2022 05:23 UTC

On Saturday, July 16, 2022 at 6:07:49 PM UTC-4, Michael J. Mahon wrote:
> > Hey guys,
> >
> > My peripheral card acts as an accelerator (a faster 6502) so what I would
> > like to do is make it so that the card is enabled (Ie. acceleration is
> > enabled) whenever an extra key is detected during reboot.
> Since Reset must be assumed to reset the keyboard port along with the rest
> of the system, I suggest polling for a (code-generating) keypress within a
> short window (say, two seconds) *after* Reset. If the key is pressed during
> the window, clear the strobe (to “consume” the keypress) and then enable
> your card.
> --
> -michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com

Thanks Michael, that sounds like the proper thing to do. I'm guessing I should check the open-apple paddle-button location to distinguish between a reset and reboot.

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by: Michael J. Mahon - Wed, 20 Jul 2022 02:05 UTC

Anthony Ortiz <anthonypaulo@gmail.com> wrote:
> On Saturday, July 16, 2022 at 6:07:49 PM UTC-4, Michael J. Mahon wrote:
>>> Hey guys,
>>>
>>> My peripheral card acts as an accelerator (a faster 6502) so what I would
>>> like to do is make it so that the card is enabled (Ie. acceleration is
>>> enabled) whenever an extra key is detected during reboot.
>> Since Reset must be assumed to reset the keyboard port along with the rest
>> of the system, I suggest polling for a (code-generating) keypress within a
>> short window (say, two seconds) *after* Reset. If the key is pressed during
>> the window, clear the strobe (to “consume” the keypress) and then enable
>> your card.
>> --
>> -michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com
>
> Thanks Michael, that sounds like the proper thing to do. I'm guessing I
> should check the open-apple paddle-button location to distinguish between
> a reset and reboot.
>

Exactly.

--
-michael - NadaNet 3.1 and AppleCrate II: http://michaeljmahon.com

Help! I'm trapped in a PDP 11/70!

computers / comp.sys.apple2 / Detect key at startup

Subject	Author
Detect key at startup	Anthony Ortiz
Re: Detect key at startup	I am Rob
Re: Detect key at startup	Michael J. Mahon
Re: Detect key at startup	Anthony Ortiz
Re: Detect key at startup	Brian Patrie
Re: Detect key at startup	Kent Dickey
Re: Detect key at startup	Anthony Ortiz
Re: Detect key at startup	Anthony Ortiz
Re: Detect key at startup	Michael J. Mahon
Re: Detect key at startup	Anthony Ortiz
Re: Detect key at startup	Michael J. Mahon