how does the Action Replay slo-mo function work?

Bren McGuire · 17 June 2021, 16:47

i never seen the action replay slo-mo function at work, and I recently found this video showing it:
[ Show youtube player ]

i was pretty amazed, how does this actually work? how can it slow down the amiga?

thomas · 17 June 2021, 17:12

I don't know how it works technically. But I remember from when I tried it on my A500 that it didn't feel like slow motion but rather like stuttering. As if it puts the CPU on halt in regular short intervals while it runs at full speed in between.

Jope · 17 June 2021, 18:49

It pulses the halt pin of the CPU a bit like an autofire circuit in a joystick.

Bren McGuire · 21 June 2021, 18:07

oh that's very interesting, i had not considered it could do that.
so could you do this to any other amiga?
are there programs or games that would break after pulsing halt?

Quote:

Originally Posted by Jope

It pulses the halt pin of the CPU a bit like an autofire circuit in a joystick.

Jope · 21 June 2021, 18:12

Many graphically intensive pieces of software fail quite spectacularly with the slomo feature.. The copper does not slow down, nor does the blitter, but anything that is synchronized to screen draw will just explode.

If there is a halt pin on the CPU, you can do it on a computer with varying success.

daxb · 21 June 2021, 19:40

My experiences with the slow motion function of the Action Replay (MKII) was that is not functional in most cases or just senseless. Maybe the game Lotus worked or some other racing games if I remember right. However, it becomes slow and boring. I speed up function instead would be cool.

17 June 2021, 16:47	#1
Bren McGuire Registered User Join Date: Nov 2019 Location: Croydon Posts: 587	how does the Action Replay slo-mo function work? i never seen the action replay slo-mo function at work, and I recently found this video showing it: [ Show youtube player ] i was pretty amazed, how does this actually work? how can it slow down the amiga?

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17 June 2021, 17:12	#2
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 7,002	I don't know how it works technically. But I remember from when I tried it on my A500 that it didn't feel like slow motion but rather like stuttering. As if it puts the CPU on halt in regular short intervals while it runs at full speed in between.

17 June 2021, 18:49	#3
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,865	It pulses the halt pin of the CPU a bit like an autofire circuit in a joystick.

21 June 2021, 18:12	#5
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,865	Many graphically intensive pieces of software fail quite spectacularly with the slomo feature.. The copper does not slow down, nor does the blitter, but anything that is synchronized to screen draw will just explode. If there is a halt pin on the CPU, you can do it on a computer with varying success.

21 June 2021, 19:40	#6
daxb Registered User Join Date: Oct 2009 Location: Germany Posts: 3,304	My experiences with the slow motion function of the Action Replay (MKII) was that is not functional in most cases or just senseless. Maybe the game Lotus worked or some other racing games if I remember right. However, it becomes slow and boring. I speed up function instead would be cool.

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