Looking for a 68060 with FPU & MMU

[Cosmos Amiga]

I'm looking for a cheap 68060 with MMU & FPU idealy a rev6...

A rev1 is ok too...

It's for a gift to SpeedGeek who have no money and work hard for the Amiga community...


Thanks,

[Cosmos Amiga]

Remember :

Maskset 01F43G = 0.60µm => rev1
Maskset 01G65V = 0.60µm => rev2
Maskset 02G59Y = 0.60µm => rev3 (LC/EC only)
Maskset 74E41J = 0.42µm => rev5
Maskset 71E41J = 0.32µm => rev6



(WARNING ON EBAY WITH UTSOURCE AND 68060RC60 : FAKE, I PURCHASED TWO, AND RETURNED = 68LC060 REBADGED WITHOUT FPU)

[Cosmos Amiga]

I have a spare rev 1 01F43G XC68060RC50 (RC=MMU+FPU) that is out of a working accelerator. I believe I overclocked it to 60MHz before I got my rev 6 68060. I live close to SpeedGeek so the shipping would probably only be 2-4 days.

Thanks from and for him !!

So, I'll send him one of my 040/060 adapter for his A3640...

I would trade for a set of 4 Lattice GAL16V8 10ns Low Heat for Amiga 3000D shipped to me in Kansas, U.S.A.

U701 = the IC with 1 white dot
U202 = the IC with 2 white dots
U203 = the IC with 3 white dots

Ok, free for you too ! Just let me you address in MP !

[Cosmos Amiga]

@SpeedGeek & @Matthey

Gifts shipped !

[Cosmos Amiga]

Utsource is the typical chinese chip peddler, they check/verify nothing and sell many fakes. I have seen them sell used pulls of chips as new that had the pins HASL(hot air solder leveled) to look somewhat new. Its estimated over 44% of chips out there are counterfeit/fakes now.

I clearly warned UTSource about theses fake 68060, but they continue to sell them on eBay... Unbelievable... No Fpu into = 68LC060

This one fake I received from UTSource :

[Cosmos Amiga]

FPU initialization code is possible that supports all 68881-68060 FPUs. This is what we did for the vbcc compiler which needs no patching:

__fpu_init:
     clr.l -(sp)
     clr.l -(sp)
     clr.l -(sp)
     frestore (sp)
     lea (12,sp),sp
     rte

No, we only need to disable the Fpu with these 040-060 adapters...


I tired to write "040-060 adapters", it's lame...

Need to find a name for them !

Any suggestions welcome ! Please, go go go...


I start :

ThunderDrome 060 ?
WaspNest 060 ?
EaglesRoad 060 ?

[Cosmos Amiga]

move.l $0010.w,d2
lea _nofpu_060(PC),a0
move.l a0,$0010.w
moveq #2,d1
movec PCR,d0
and.l   d1,d0            ; 2 = %0010
cmp.l   d1,d0
beq.b _nofpu_060
fnop
movec d1,PCR            ; = disable the 060 Fpu
_nofpu_060
move.l d2,$0010.w

This routine should works on every 68k : coders, it's ok ?

[Cosmos Amiga]

Hey, zero system mounted here : this code is for the very first line of the exec.library

[Cosmos Amiga]

Super !

You can push 68060 rev1 at 60 Mhz : this will give you a +20% extra CPU power !!

A small fan glued on one side will help a lot to dissipate the heat into your A3000D desktop...

[Cosmos Amiga]

@NorthWay

Again, we are at the first top lines of the exec.library... Zero system mounted...

Remember : the goal is to disable the Fpu with a 68000/010/020/030/040/EC/LC compatibility...

[Cosmos Amiga]

Good luck !!

[Cosmos Amiga]

OK, episode #4 of A3660 overclocking is completed!

Unfortunately, SysSpeed becomes less accurate at higher clock speeds so I have included a Scout result as well.

The CLK_D4 GAL signal BGACK_040 is now connected to VCC. This always  runs the mobo at the 1/4x clock speed. Also, more A3000 mobo and CLK90  timing mods were made to keep the following clocks skew compensated and  stable:

68060 CPU = 80MHz
A3640 logic = 40MHz*
A3000 mobo = 20MHz

Note: Considering that the A3000 is a timing intolerant beast  overclocking the mobo to 40MHz was not a practical consideration here.

*A3640 state machine mod required

Fantastic !

Will works on the A4000 ?