Picture of a Vampire card mounted on an Atari

[Motormouth]

I think making hardware that fits is the complicated part, not the actual core. Many macs came with CPU slot, I'm sure the socket is exotic I have a Quadra with PowerPC CPU card myself, a fast 68k card CPU card for it would be great.

I guess I was thinking of the older 68000 macs.  The Quadra's are already 040s.  From my memory, The addressing space in the early macs was quite simple compared to the Amiga's or even Atari's mostly due to the fact the later two have significant custom chips.

[Iggy]

I guess I was thinking of the older 68000 macs. The Quadra's are already 040s. From my memory, The addressing space in the early macs was quite simple compared to the Amiga's or even Atari's mostly due to the fact the later two have significant custom chips.

From what I remember the addressing schemes were a total disaster in some early Macs.
 Weren't there a few that could only address 8 out 16 MBs?

[Motormouth]

From what I remember the addressing schemes were a total disaster in some early Macs.
 Weren't there a few that could only address 8 out 16 MBs?

Err well This is more a function of the 68000.  They were similar to the A1000/A500/A2000.  They could only address 8 megs with a 24 bit memory space.  Unfortunately, doesn't this sound familiar.

Most of the really early ones could only be expanded to 4 megs on the motherboard.  The mac SE (for example) could go to more if a 68030 accelerator was added, (again a function of the 68030 rather than the mac itself.)

[Motormouth]

One of the macs that was messed up was the mac LC.  It had a 68020 and could only use 10 megs of ram.  It could use more with a processor upgrade. (again doesn't this sound like a certain amiga with a 68EC020, ummm an A1200).  But this is getting a bit to far from the topic.  That is a vampire in an a 68000 Atari.

[bitman]

There's a short video here: https://vimeo.com/187388251
And a thread on the subject here: http://apollo-core.com/knowledge.php?b=1¬e=1962&order=&x=0

[paul1981]

Will it work in my Sega Mega Drive? :-).

I think it would be game over before you start!

[Iggy]

damn straight:hammer: my hate for Atari is almost as bad as that for Apple products:whack::lol:

 
 "..hate for Atari.."
 weird, the Apple thing I can get, 'cause Jobs was a nob...
 
 But the Atari ST was just an affordable 68K system.
 Crappy video, but still, a good price.

[Iggy]

Err well This is more a function of the 68000. They were similar to the A1000/A500/A2000. They could only address 8 megs with a 24 bit memory space. Unfortunately, doesn't this sound familiar.

Most of the really early ones could only be expanded to 4 megs on the motherboard. The mac SE (for example) could go to more if a 68030 accelerator was added, (again a function of the 68030 rather than the mac itself.)

A 24bit address scheme should be able to address 16 megabytes.
Not that its vital, since most of my early 68K systems couldn't handle more than 4MB either, ram was expensive.
But I'm fairly sure I remember at least one Mac model that wasted half the addressing capability.

As far as accelerators go, I've always wondered how they addressed tying in the ram to the rest of the system since DMA and other functions would be easily available.

AND, outside our little diversion, I'm glad to see the Vampire applied to boards outside the Amiga.
There are lots of applications that could benefit from this device.

[Arnuph1s]

AND, outside our little diversion, I'm glad to see the Vampire applied to boards outside the Amiga.
There are lots of applications that could benefit from this device.

Exactly. We want to see them be successful and keep on producing nice things like these for our retro systems.