FPU 68882 40 Mhz and crystal 48 Mhz

paulo_becas · 02 July 2012, 00:05

Just a quick question,

I have a FPU 68882 40 Mhz but i can't get my hands on a 40 mhz crystal.
Can i use a 48 Mhz crystal with a 40 mhz FPU?

rampartsagain · 02 July 2012, 01:53

Ola Paulo is this what you are looking for'

http://www.ebay.com/itm/40MHz-Xtal-Q...item2eb8cba2eb

if it is tell me because i think i have one or two of these ,and i can give you when we do that trade we talked about.

by the way i have been studiyng some things for the amiga that you will be happy to know

paulo_becas · 02 July 2012, 09:20

Hi José,

It's exactly that, i can't get any here in Portugal, if you have them i would be much thankful if you could hook me up with one.
I have to go to my parents place to bring you what i promised. I'll have it this week.

rampartsagain · 02 July 2012, 10:00

damn i saw but i don´t have

all i have is 25.00 and 28.37mhz if you have problems on buying through ebay let me know

SilentBob · 02 July 2012, 11:05

The 68882 in my Blizzard 1230-IV is rated for 40 MHz, but it runs fine at 50 MHz. So it should be good.

paulo_becas · 02 July 2012, 11:18

I'm afraid to try a crystal above 40mhz, so you're saying that you're using a 50mhz crystal with a 40mhz FPU?

roy bates · 02 July 2012, 11:48

there are two types of 68882 apart from mask. plcc package and pga,the one on blizzards are pga.

i wouldent overclock a plcc fpu.

altcomputing · 02 July 2012, 12:10

Quote:

Originally Posted by paulo_becas

I'm afraid to try a crystal above 40mhz, so you're saying that you're using a 50mhz crystal with a 40mhz FPU?

Don't worry, I used to overclock a 33MHz '882 to 50MHz on my old A3630 and it didn't even heat.

paulo_becas · 02 July 2012, 14:59

Quote:

Originally Posted by roy bates

there are two types of 68882 apart from mask. plcc package and pga,the one on blizzards are pga.

i wouldent overclock a plcc fpu.

Mine is a PGA FPU, i'll give it a try with a 50Mhz crystal and see what happens

.
Do i have to do anything else?

roy bates · 02 July 2012, 15:04

Quote:

Originally Posted by paulo_becas

Mine is a PGA FPU, i'll give it a try with a 50Mhz crystal and see what happens

.
Do i have to do anything else?

no, it will either work or it wont.

SilentBob · 09 July 2012, 16:47

Quote:

Originally Posted by paulo_becas

I'm afraid to try a crystal above 40mhz, so you're saying that you're using a 50mhz crystal with a 40mhz FPU?

Yeah. It's been rock solid since 1996. (That's when I bought the 1230-IV).

02 July 2012, 00:05	#1
paulo_becas Banned Join Date: Feb 2010 Location: https://t.me/pump_upp Posts: 463	FPU 68882 40 Mhz and crystal 48 Mhz Just a quick question, I have a FPU 68882 40 Mhz but i can't get my hands on a 40 mhz crystal. Can i use a 48 Mhz crystal with a 40 mhz FPU?

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02 July 2012, 01:53	#2
rampartsagain Registered User Join Date: May 2012 Location: Porto/Portugal Posts: 385	Ola Paulo is this what you are looking for' http://www.ebay.com/itm/40MHz-Xtal-Q...item2eb8cba2eb if it is tell me because i think i have one or two of these ,and i can give you when we do that trade we talked about. by the way i have been studiyng some things for the amiga that you will be happy to know

02 July 2012, 09:20	#3
paulo_becas Banned Join Date: Feb 2010 Location: https://t.me/pump_upp Posts: 463	Hi José, It's exactly that, i can't get any here in Portugal, if you have them i would be much thankful if you could hook me up with one. I have to go to my parents place to bring you what i promised. I'll have it this week.

02 July 2012, 10:00	#4
rampartsagain Registered User Join Date: May 2012 Location: Porto/Portugal Posts: 385	damn i saw but i don´t have all i have is 25.00 and 28.37mhz if you have problems on buying through ebay let me know

02 July 2012, 11:05	#5
SilentBob Junior Member Join Date: Nov 2003 Location: Norway Age: 48 Posts: 244	The 68882 in my Blizzard 1230-IV is rated for 40 MHz, but it runs fine at 50 MHz. So it should be good.

02 July 2012, 11:18	#6
paulo_becas Banned Join Date: Feb 2010 Location: https://t.me/pump_upp Posts: 463	I'm afraid to try a crystal above 40mhz, so you're saying that you're using a 50mhz crystal with a 40mhz FPU?

02 July 2012, 11:48	#7
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 54 Posts: 2,827	there are two types of 68882 apart from mask. plcc package and pga,the one on blizzards are pga. i wouldent overclock a plcc fpu.

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