Is this any good for an A500 mod ?

kipper2k · 12 June 2011, 16:18

found this when trolling Ebay...

http://cgi.ebay.ca/Toshiba-68000-pro...item35a91f3151

is that workable ?

Jope · 12 June 2011, 17:52

It should work 100% as a replacement for the 68000 already in your A500.

The speed will not be increased.

kipper2k · 12 June 2011, 18:26

Thanks for the reply Jope

alexh · 12 June 2011, 19:36

What's wrong with your existing 68k?

This won't run at 12MHz just by plugging it in (but I'm sure you know that).

kipper2k · 12 June 2011, 23:42

Quote:

Originally Posted by alexh

What's wrong with your existing 68k?

This won't run at 12MHz just by plugging it in (but I'm sure you know that).

Hi Alexh, yup, i was wondering if there is any way to increase all clocks to reflect a higher speed

DonAmiga · 13 June 2011, 01:22

Quote:

Originally Posted by kipper2k

Hi Alexh, yup, i was wondering if there is any way to increase all clocks to reflect a higher speed

I got a 16mhz thinking it would increase but it doesn't.

It would be good to know why?

Cheers

Jope · 13 June 2011, 04:15

Quote:

Originally Posted by DonAmiga

I got a 16mhz thinking it would increase but it doesn't.

It would be good to know why?

The speed printed on the chip is the maximum speed it can be used at. The A500 runs the chip at around 7 MHz, because that is the frequency the motherboard generates for the CPU.

It is not trivial to increase the clock speed due to everything in the A500 being synchronized.

DonAmiga · 13 June 2011, 16:41

Quote:

Originally Posted by Jope

The speed printed on the chip is the maximum speed it can be used at. The A500 runs the chip at around 7 MHz, because that is the frequency the motherboard generates for the CPU.

It is not trivial to increase the clock speed due to everything in the A500 being synchronized.

Cheers

rkauer · 14 June 2011, 08:46

Also keep in mind that Toshiba units are different to a extent from Motorola units.

I get some not so cool experiences using a Toshiba 68000 in one A500 until I figured out the Toshiba chip was the culprit. I had to fabricate two sets of resistor pull-ups to cure the problem.

12 June 2011, 16:18	#1
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	Is this any good for an A500 mod ? found this when trolling Ebay... http://cgi.ebay.ca/Toshiba-68000-pro...item35a91f3151 is that workable ?

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12 June 2011, 17:52	#2
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,910	It should work 100% as a replacement for the 68000 already in your A500. The speed will not be increased.

12 June 2011, 18:26	#3
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	Thanks for the reply Jope

12 June 2011, 19:36	#4
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,460	What's wrong with your existing 68k? This won't run at 12MHz just by plugging it in (but I'm sure you know that).

14 June 2011, 08:46	#9
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Also keep in mind that Toshiba units are different to a extent from Motorola units. I get some not so cool experiences using a Toshiba 68000 in one A500 until I figured out the Toshiba chip was the culprit. I had to fabricate two sets of resistor pull-ups to cure the problem.

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