On 21/11/06 22:54, "Chris M" <chrism3667 at yahoo.com> wrote: Bah, 15 here because I knew nothing about libraries or programming on the beast :) -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

On 21/11/06 23:29, "Chris M" <chrism3667 at yahoo.com> wrote: The original A4000 was a 68020 wasn't it? -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

On 11/22/06, Chris M <chrism3667 at yahoo.com> wrote: Yep... a 68EC030, to be specific (no MMU, thus Enforcer won't run, etc). One _can_ replace the 'EC030 with a full 68030, but a full-on SMT rework station is recommended. It's easier to upgrade the CPU board to an 040 or better. The Amiga, too. The difference is that the "MOVcc" instructions are priv'ed on the 68010, and the stack frame can be larger, permitting true instruction restart, and, thus, easy-to-implement page-demand virtual memory, a-la UNIX. One "test" for the 68010 in the Amiga is to run OS1.1 (if possible), then fire up the calculator. You should get a Guru Meditation with a 68010 installed and not a 68000... it's an embedded MOVcc in the application (rather than a call to the OS which _does_ know what to to). The Calculator app that comes with OS1.2 does request the condition codes from the OS rather than executing a potentially illegal instruction in user mode. Yep... it needs that for its virtual memory implementation. It's _possible_ to design a true 68000 system with VM, but much, much harder, typically requiring external state-saving hardware or, as in the case of the Perkin-Elmer workstation, a second 68000 to take care of things while the primary CPU is page faulting. Anyone that still carries any of the older CPUs new is likely to have a price that seems painful. OTOH, how many places _still_ carry the '020? You are paying for storage and inventory, not the chip itself. No idea. -ethan

On 22/11/06 00:46, "Chris M" <chrism3667 at yahoo.com> wrote: Nope, no point - Lisa sunk before such things would've been worthwhile... -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?

On 11/23/06, Warren Wolfe <wizard at voyager.net> wrote: The usual variants were "EC" ("embedded controller") and "LC" ("low cost"). The 68EC020 has a narrower address bus (24 bits vs 32), limiting the amount of FAST mem to 10MB (16MB total address space), while the 68EC030 and 68EC040 are lacking in an onboard MMU (the 68LC040 is lacking an onboard floating point processor). You'd be unlikely to see an 'EC030 or 'EC040 in a UNIX workstation because an MMU is just too handy for an OS that's heavily intertwined with virtual memory. OTOH, since AmigaOS has one address space for all processes, it doesn't need an MMU (but can optionally take advantage of one through programs like Enforcer). In the realm of 68K Macs, though, I'm not sure if they can or do use an MMU if present. -ethan

--- Ethan Dicks <ethan.dicks at gmail.com> wrote: Dude, you should have aced it then. AOAS I don't feel so bad. ____________________________________________________________________________________ Sponsored Link Rates near 39yr lows. $420,000 Loan for $1399/mo. Calcuate new payment. www.LowerMyBills.com/lre

Ethan Dicks wrote: I got 9 out of 30. I took the test in German. I don't speak German. Never used an Amiga, either.

20 outta 30 :-( // http://www.commodore128.org Commodore 128 forums & more! //