HowTo: Amiga 500 speedup w/ oscillator

Reynolds · 02 March 2010, 16:04

I've been thinking to speed up my Amiga 500 with a new oscillator on the mobo. Is it possible somehow? It has an Amiga A590 with 2Megs of Fast Ram, and 1 mb chipram on board.
I know that Icould sweep through the net for solutions, but first of all I would like to see experiences if it can be done. how the machine performs, fails, and so on. I don't want to build up a nuclear plant from it, just see more frames in games with vector gfx.
So, can it be done?

Thanks for all,

DDNI · 02 March 2010, 16:14

The custom chips need the original osc for their timing. If you change the oscillator then you can expect problems.

s2325 · 02 March 2010, 16:15

Yes, Pinball Fantasies is unplayable without near perfect timing, I'm sure there are more.

Toni Wilen · 02 March 2010, 16:28

It is practically impossible to do (without separating CPU clock from chipset clock, like 14MHz 68000 hacks do)

In theory crystal can be changed and system keeps working, Amiga programs won't see any difference (as long as chips can handle new clock rate) but user surely will

Video timing changes (=signal becomes incompatible with PAL or NTSC), audio pitch changes, floppy timing changes (floppy access stops working), expansion hardware most likely stops working, everything that is connected to "outside world" changes..

02 March 2010, 16:04	#1
Reynolds Alien Breeder Join Date: Dec 2007 Location: Szigetszentmiklos / Hungary Age: 46 Posts: 1,096	HowTo: Amiga 500 speedup w/ oscillator I've been thinking to speed up my Amiga 500 with a new oscillator on the mobo. Is it possible somehow? It has an Amiga A590 with 2Megs of Fast Ram, and 1 mb chipram on board. I know that Icould sweep through the net for solutions, but first of all I would like to see experiences if it can be done. how the machine performs, fails, and so on. I don't want to build up a nuclear plant from it, just see more frames in games with vector gfx. So, can it be done? Thanks for all,

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02 March 2010, 16:14	#2
DDNI Targ Explorer Join Date: Mar 2006 Location: Northern Ireland Posts: 5,431	The custom chips need the original osc for their timing. If you change the oscillator then you can expect problems.

02 March 2010, 16:15	#3
s2325 Zone Friend Join Date: Jun 2006 Location: Gargore Age: 43 Posts: 17,789	Yes, Pinball Fantasies is unplayable without near perfect timing, I'm sure there are more.

02 March 2010, 16:28	#4
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,507	It is practically impossible to do (without separating CPU clock from chipset clock, like 14MHz 68000 hacks do) In theory crystal can be changed and system keeps working, Amiga programs won't see any difference (as long as chips can handle new clock rate) but user surely will Video timing changes (=signal becomes incompatible with PAL or NTSC), audio pitch changes, floppy timing changes (floppy access stops working), expansion hardware most likely stops working, everything that is connected to "outside world" changes..

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