68040 and FPU mania

[Jockelill]

An Apple retailer here in Sweden (he has sold Apple since the 1990s), listed some "new old stock", so I took a plunge and bought it all

In the end I got:
10 XC68040RC33
3 FPU for LC/LC2
3 FPU for Color Classic
3 FPU for Classic
2 FPU for Classic 2
2 Loose 68882 FPU
1 PowerPC CPU-card

I'm not planning on keeping everything, since I don't even own all the machines myself, but I will make a trading post at some point. The 68040s where too good to be left alone .

Joakim

 

[zefrenchtoon]

FPU on B&W classic ??? How is that possible ?
Can you share me a picture please ? I’m curious.

 

[Phipli]

FPU on B&W classic ??? How is that possible ?
Can you share me a picture please ? I’m curious.

I think it is a typo, there is only Classic II and Color Classic labels in the photos.

It is possible to use a 68882 with a 68000 though, but they have to be memory mapped instead of how it is done with an 020 or 030. It would be slower, but some other platforms did it.

 

[zefrenchtoon]

I think it is a typo, there is only Classic II and Color Classic labels in the photos.

It is possible to use a 68882 with a 68000 though, but they have to be memory mapped instead of how it is done with an 020 or 030. It would be slower, but some other platforms did it.

Thanks!

 

[Jockelill]

Thanks!

Yeah, sorry about that, its a typo . I will blame the jetlag (currently in china).

 

[LaPorta]

How much do you want for one of the Classic II FPUs?

 

[Jockelill]

How much do you want for one of the Classic II FPUs?

40$ plus shipping?

 

[joshc]

XC68040RC33

How much are you looking to sell these for each? Thanks

 

[Jockelill]

How much are you looking to sell these for each? Thanks

I sent you a PM

 

[Paralel]

I am fascinated by the ROM space on that Classic II FPU/ROM card. Is there a socket for it on either side, or it was omitted?

 

[Apfelklassik.de]

Mmm ... 040 non-LC-upgrade Chips - how much incl EU shipping?

 

[Performa450]

Also interested in a full-fat 040

 

[Jockelill]

I am fascinated by the ROM space on that Classic II FPU/ROM card. Is there a socket for it on either side, or it was omitted?

Almost broke my heart to open it , but I was also curious, looks like this:

 

[Jockelill]

Mmm ... 040 non-LC-upgrade Chips - how much incl EU shipping?

Sent you a PM

 

[Paralel]

Almost broke my heart to open it , but I was also curious, looks like this:

Interesting design choice to situation the ROM in that location.

For anyone that wants to buy it, if I'm interpreting the design correctly, it is actually more than it seems. It can run the 16 MHz 68882 installed if JP1 is left on, so it uses the system clock. However, if you put an oscillator in U3 and remove the jumper, it should be capable of handing a 68882 all the way up to 40 MHz as long as the 68882 is matched to the frequency of the oscillator.

 

[zefrenchtoon]

Another quest for Bolle & co to copy its design !

 

[Jockelill]

Interesting design choice to situation the ROM in that location.

For anyone that wants to buy it, if I'm interpreting the design correctly, it is actually more than it seems. It can run the 16 MHz 68882 installed if JP1 is left on, so it uses the system clock. However, if you put an oscillator in U3 and remove the jumper, it should be capable of handing a 68882 all the way up to 40 MHz as long as the 68882 is matched to the frequency of the oscillator.

Very interesting! Thanks for the information! Question, would the classic II really benefit from running the fpu at 40Mhz given that the bus is only 16bits wide?

The card also looks very cloneable . Might be a project for later

 

[cheesestraws]

Interesting design choice to situation the ROM in that location.

I always wonder why they bothered putting a ROM socket on those FPU upgrades at all (other than 'because it's technically another feature'). The C II ROM support is almost totally functionally useless.

 

[zefrenchtoon]

I always wonder why they bothered putting a ROM socket on those FPU upgrades at all (other than 'because it's technically another feature'). The C II ROM support is almost totally functionally useless.

Maybe it allows you to put a bigger one than the stock one ? (I'm a newbie in this domain, this can be completly wtf what I said) ^^'

 

[cheesestraws]

Maybe it allows you to put a bigger one than the stock one ? (I'm a newbie in this domain, this can be completly wtf what I said) ^^'

No, good idea—that hadn't actually occurred to me for some reason. I had to go and check the devnote for the Classic II. But no: the OS/Toolbox rom is 16 bits wide and the ROM slot is 8 bits wide.

And it isn't supported by the Slot Manager either, so I've absolutely no idea how anyone was ever meant to do anything useful with it.