Overclocking 68882 40MHz to 50Mhz

amiman99 · 30 January 2011, 19:12

Is there a problem overclocking MC68882 40MHz to 50MHz? Is is stable? The 50 MHz version is hard to come by. I have Blizzard IV for A1200.
Thanx

fitzsteve · 30 January 2011, 19:18

Quote:

Originally Posted by amiman99

Is there a problem overclocking MC68882 40MHz to 50MHz? Is is stable? The 50 MHz version is hard to come by. I have Blizzard IV for A1200.
Thanx

You should be ok, I ran a 40mhz 68882 @50mhz on my Blizz 1230MkIV and it was fine

amiman99 · 30 January 2011, 19:37

How about XC versions of the chip, I read that they are to as good as MC, is that true???

fitzsteve · 30 January 2011, 19:43

Quote:

Originally Posted by amiman99

How about XC versions of the chip, I read that they are to as good as MC, is that true???

I don't know about that, but I did read that the 40mhz versions were often just re-badged 50mhz ones

pandy71 · 30 January 2011, 21:20

Put some small heatsink on it, maybe one of those dedicated for modern memory chips.

It should run ok even with higher clock.

amiman99 · 31 January 2011, 01:16

Quote:

Originally Posted by pandy71

Put some small heatsink on it, maybe one of those dedicated for modern memory chips.

It should run ok even with higher clock.

Great idea!

AndyLandy · 31 January 2011, 13:02

I'm sure I read somewhere (possibly from rkauer) that all the PGA 68882s are the same and you can clock any of them to 50MHz quite safely. I'd do your homework first to be sure, but you could be lucky.

prowler · 01 February 2011, 01:23

Quote:

Originally Posted by AndyLandy

I'm sure I read somewhere (possibly from rkauer) that all the PGA 68882s are the same and you can clock any of them to 50MHz quite safely. I'd do your homework first to be sure, but you could be lucky.

That's what I've heard too, but I didn't want to be the first to post in case my memory had blurred in the meantime...

desantii · 01 February 2011, 04:42

I have it running at 56mhz and its rock stable

fc.studio · 03 February 2011, 22:54

Quote:

Originally Posted by amiman99

How about XC versions of the chip, I read that they are to as good as MC, is that true???

I read somewhere that MC is better than XC for overclocking.

rkauer · 04 February 2011, 02:15

XC is eXperimental controller, MC is Military Certified.

XC is the earlier chips that usually heat a lot more than the final MC versions.

Jope · 04 February 2011, 17:27

Quote:

Originally Posted by rkauer

XC is eXperimental controller, MC is Military Certified.

Eh wot?

rkauer · 04 February 2011, 18:38

???

MC means military certified for Motorola/Freescale CPU and the likes. Believe it or not, the MC68060 CPU is used on guided bombs & missiles.

pandy71 · 04 February 2011, 19:01

XC is similar to Intel engineering samples, MC is a commercial product - military products are usually available under different marking.

Jope · 04 February 2011, 21:07

Quote:

Originally Posted by rkauer

???

MC means military certified for Motorola/Freescale CPU and the likes. Believe it or not, the MC68060 CPU is used on guided bombs & missiles.

I fully believe they have powered bombs & missiles, but where did you get the MC=Military Certified? Care to link me to a Motorola datasheet or something to support this claim?

MC is just the manufacturer code for Motorola. Just like Z is Zilog, Am is AMD, TMS is Texas Instruments etc..

Lockon · 05 February 2011, 20:45

MC68000 is key component of AGM-88A HARM (High Speed Anti Radiation Missile), weapon designed to take out land and naval based radars. Manufacturer, Texas Instruments, used 68K to triangulate source of radar waves in realtime, storing fixed position into memory (maybe that was FastRAM, LOL) just in case radar operator switched off radar (common practice used in order to break lock on anti-radiation missiles of previous generation).
Just to put things into historic aspect, that was back in 1985.

pandy71 · 06 February 2011, 13:54

TI IMO use for this TMS320 family (still producing in MIL version even old 320C10), 68K is used due of high popularity of the VME standard in industry and military - but still this not change that XC means pre-productions chips (still some potential errors to fix) and MC means Motorola Certified ie commercial product free from known errors.

Hungry Horace · 06 February 2011, 14:07

Quote:

Originally Posted by Jope

MC is just the manufacturer code for Motorola. Just like Z is Zilog, Am is AMD, TMS is Texas Instruments etc..

given the naming of 68000's by others in the same form:

Hitachi (HD68000)
Mostek (MK68000)
Rockwell (R68000)
Signetics (SCN68000)
Thomson (EF68000/TS68000)
Toshiba (TMP68000)

Then i would be inclined to agree with Jope on this one! MC as 'military certified' just seems to random a leap from the naming convention, whilst 'Motorola Certified' seems a lot more... well.... sensible

pandy71 · 06 February 2011, 17:21

All IC from Motorola are MC - eg MC1309 is FM Stereo Decoder - seems not very usefull functionality for military.

frank_b · 06 February 2011, 17:36

Quote:

Originally Posted by pandy71

All IC from Motorola are MC - eg MC1309 is FM Stereo Decoder - seems not very usefull functionality for military.

Would this mean there are some Military Spec amigas out there? :P

30 January 2011, 19:12	#1
amiman99 Registered User Join Date: Sep 2009 Location: San Antonio, TX USA Age: 50 Posts: 1,184	Overclocking 68882 40MHz to 50Mhz Is there a problem overclocking MC68882 40MHz to 50MHz? Is is stable? The 50 MHz version is hard to come by. I have Blizzard IV for A1200. Thanx

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30 January 2011, 19:37	#3
amiman99 Registered User Join Date: Sep 2009 Location: San Antonio, TX USA Age: 50 Posts: 1,184	How about XC versions of the chip, I read that they are to as good as MC, is that true???

30 January 2011, 21:20	#5
pandy71 Registered User Join Date: Jun 2010 Location: PL? Posts: 2,745	Put some small heatsink on it, maybe one of those dedicated for modern memory chips. It should run ok even with higher clock.

31 January 2011, 13:02	#7
AndyLandy Registered User Join Date: Dec 2009 Location: Southampton / UK Posts: 91	I'm sure I read somewhere (possibly from rkauer) that all the PGA 68882s are the same and you can clock any of them to 50MHz quite safely. I'd do your homework first to be sure, but you could be lucky.

01 February 2011, 04:42	#9
desantii Registered User Join Date: Oct 2009 Location: Oswego, IL Posts: 125	I have it running at 56mhz and its rock stable

04 February 2011, 02:15	#11
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	XC is eXperimental controller, MC is Military Certified. XC is the earlier chips that usually heat a lot more than the final MC versions.

04 February 2011, 18:38	#13
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	??? MC means military certified for Motorola/Freescale CPU and the likes. Believe it or not, the MC68060 CPU is used on guided bombs & missiles.

04 February 2011, 19:01	#14
pandy71 Registered User Join Date: Jun 2010 Location: PL? Posts: 2,745	XC is similar to Intel engineering samples, MC is a commercial product - military products are usually available under different marking.

05 February 2011, 20:45	#16
Lockon Air supremacy Join Date: Aug 2008 Location: Rijeka Croatia Age: 49 Posts: 121	MC68000 is key component of AGM-88A HARM (High Speed Anti Radiation Missile), weapon designed to take out land and naval based radars. Manufacturer, Texas Instruments, used 68K to triangulate source of radar waves in realtime, storing fixed position into memory (maybe that was FastRAM, LOL) just in case radar operator switched off radar (common practice used in order to break lock on anti-radiation missiles of previous generation). Just to put things into historic aspect, that was back in 1985.

06 February 2011, 13:54	#17
pandy71 Registered User Join Date: Jun 2010 Location: PL? Posts: 2,745	TI IMO use for this TMS320 family (still producing in MIL version even old 320C10), 68K is used due of high popularity of the VME standard in industry and military - but still this not change that XC means pre-productions chips (still some potential errors to fix) and MC means Motorola Certified ie commercial product free from known errors.

06 February 2011, 17:21	#19
pandy71 Registered User Join Date: Jun 2010 Location: PL? Posts: 2,745	All IC from Motorola are MC - eg MC1309 is FM Stereo Decoder - seems not very usefull functionality for military.

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