ravi@eneevax.UUCP (Ravi Kulkarni) (01/27/85)
I was wondering how hard it would be to replace the 68k on the mac with a little board that would contain a 68020,fpu and mmu and plug into the 68k socket. I don't think interfacing the 68020 would be that hard since it has dynamic bus sizing. Is there a chip set available for the 68k series equivalent to the 3 chip set offered by national in it's 32000 series, namely the demand paged mmu, and floating point unit and cpu unit? I would be interested in knowing some of the technical issues involved in trying to put this in a mac both hardware and software wise. One other question is how much improvement can be expected by just replacing the 68000 with the 68020 at the same clock rate and maintaining the 16 bit bus? -- ARPA: eneevax!ravi@maryland UUCP: [seismo,allegra]!umcp-cs!eneevax!ravi
chuqui@nsc.UUCP (Chuq Von Rospach) (01/31/85)
In article <227@eneevax.UUCP> ravi@eneevax.UUCP (Ravi Kulkarni) writes: >I was wondering how hard it would be to replace the 68k on the >mac with a little board that would contain a 68020,fpu and mmu >and plug into the 68k socket. I don't think interfacing the >68020 would be that hard since it has dynamic bus sizing. Is >there a chip set available for the 68k series equivalent to the >3 chip set offered by national in it's 32000 series, namely the >demand paged mmu, and floating point unit and cpu unit? I would >be interested in knowing some of the technical issues involved >in trying to put this in a mac both hardware and software wise. >One other question is how much improvement can be expected by >just replacing the 68000 with the 68020 at the same clock rate >and maintaining the 16 bit bus? > The 68020 replacement question was handled by Lon Poole in this months Macworld. Rather than type it in, I refer you to his column... chuq -- From the ministry of silly talks: Chuq Von Rospach {allegra,cbosgd,hplabs,ihnp4,seismo}!nsc!chuqui nsc!chuqui@decwrl.ARPA Life, the Universe, and lots of other stuff is a trademark of AT&T Bell Labs