Thread

Powerbook 190cs/66 ?

68kMLA 68k 5 posts Dec 5, 2007 to Dec 6, 2007

#1 Wed, 5 Dec 2007 - 22:41 68kMLA

I don’t get it – is it a 33mhz or a 66? And if it’s a 66, doesn’t that make it the fastest 68k machine?

http://www.everymac.com/systems/apple/powerbook/stats/mac_powerbook190cs_66.html

#2 Wed, 5 Dec 2007 - 23:20 68kMLA

It's 33 MHz. Sometimes, 68040 chips are referred to as double their actual speed rating because the clock input runs at double the main speed.

Read note 1 on your linked page:

This model is designated as having a 66 MHz processor, since theclock input runs at 66 MHz. However, the processor itself is not

"clock doubled", so technically it is only a 33 MHz processor.

#3 Wed, 5 Dec 2007 - 23:28 68kMLA

Thanx. I read the note but wasn't sure what speed it ran at effectively. Sounds like some clever marketing by Apple!

#4 Thu, 6 Dec 2007 - 00:00 68kMLA

I believe it was done as a way of competing with PC manufacturers, who at the time were using 66 Mhz 486DX2/66's.

#5 Thu, 6 Dec 2007 - 04:39 68kMLA

I guess 33 looked pretty slow compared to their own PowerMacs, too !