Crystal osc for Blizzard A1200/4 + 68882 FPU

[Hodgkinson]

Hi there,
What crystal should I get from amigakit for my Blizzard A1200/4 RAM board in order to compliment a 68882 33Mhz FPU unit?

I see that the BBOAH shows the board with a 30.000Mhz oscillator installed, yet the closest amigakit supply are 28.6363Mhz and 33.330Mhz oscillators.

Comments appreciated,
Hodgkinson.

EDIT: Ooops, just checked. BBOAH shows a 32.000Mhz osc.

[Hodgkinson]

Hmmm.
I've just been looking at the MC68882 datasheet from www.alldatasheet.com and under page 38 for the AC Electrical specifications - Clock input there is a max of 33.33Mhz under the 33.33Mhz coloum.

The 33.33Mhz osc might just be spot on for the FPU by the looks of this.

Just thought i'd post the info,
Comments still appreciated,
Hodgkinson.

[Hodgkinson]

Thanks for the replies.
The A1200/4 board that I have doesn't have the FPU or the crystal installed. Presumably the FPU/Crystal is a optional extra. The FPU accepted is the PLCC (Black plastic case, small metal pads around the edge) type 33Mhz clock.

When I get the FPU i'll check the temp after a while of running.

Btw, the A1200/4 isn't a coprocessor board. Its just a RAM board with a RTC and (Presumably optional) FPU.

Regards,
Hodgkinson.

[Hodgkinson]

Thanks for all the advice!

I've now ordered a 68882 and 33.33Mhz Crystal from AmigaKit. Should arrive any time soon.

Regards,
Hodgkinson.

[Hodgkinson]

The FPU and the crystal arrived a few days ago and I've just had chance to install them. The CPU command does indeed report the presence of a 68882 FPU installed!

Can anyone give me any clues as to wether there are any specialised libraries that I should now install to get the most out of my FPU?

Thanks for the comments, and thanks Amigakit,
Regards,
Hodgkinson.

[Hodgkinson]

Thanks!

A1200 Without FPU
New Shell process 6
6.WB3.0:> cpu
System: 68020 (INST: Cache)
6.WB3.0:>

A1200 FPU Installed
New Shell process 6
6.WB3.0:> cpu
System: 68020 68882 (INST: Cache)
6.WB3.0:>

 :lol:  :crazy:  :-o