jwright@atanasoff.cs.iastate.edu (Jim Wright) (03/24/89)
In article <11039@well.UUCP> ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab) writes: [ all context deftly removed :] | Nice, but there's no room in the ROM for it. | | Leo L. Schwab -- The Guy in The Cape INET: well!ewhac@ucbvax.Berkeley.EDU This is something I've been wondering about. Is the Amiga (other than the 1000) inherently limited to 256K ROMs? At the price of losing some compatibility with 1000's, how easy is it to install larger ROMs? Could a 512K, 1M, etc. sized be easily used or is the hardware limited to addressing only 256K? (I don't want to start a religious war, I'm just curious. No flames from 1000 fans, please.) -- Jim Wright jwright@atanasoff.cs.iastate.edu
mp1u+@andrew.cmu.edu (Michael Portuesi) (03/25/89)
jwright@atanasoff.cs.iastate.edu (Jim Wright) writes: > In article <11039@well.UUCP> ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab) writes: > > | Nice, but there's no room in the ROM for it. > | > | Leo L. Schwab -- The Guy in The Cape INET: well!ewhac@ucbvax.Berkeley.EDU > > This is something I've been wondering about. Is the Amiga (other than > the 1000) inherently limited to 256K ROMs? At the price of losing some > compatibility with 1000's, how easy is it to install larger ROMs? Could > a 512K, 1M, etc. sized be easily used or is the hardware limited to > addressing only 256K? The 500 and the 2000 can definitely support 512K of ROM, though I don't think the software designers want to do that just yet. As for A1000's, I asked this question a long time ago, and I think the answer is that the A1000 can also support 512K of ROM space, though it is not straightforward (you have to cut a trace or change a PAL or something like that). Could someone from Commodore please correct me if I am wrong, or add a few more details? -- Michael Portuesi / Information Technology Center / Carnegie Mellon University INET: mp1u+@andrew.cmu.edu / BITNET: mp1u+@andrew UUCP: ...harvard!andrew.cmu.edu!mp1u+ "You just don't get off a spaceship and run." --Avon
daveh@cbmvax.UUCP (Dave Haynie) (03/29/89)
in article <904@atanasoff.cs.iastate.edu>, jwright@atanasoff.cs.iastate.edu (Jim Wright) says: > > This is something I've been wondering about. Is the Amiga (other than > the 1000) inherently limited to 256K ROMs? At the price of losing some > compatibility with 1000's, how easy is it to install larger ROMs? A500s and A2000s are designed to accept a pin-compatible 512K ROM. The main reason for NOT building a 512K ROM today is the extra trouble A1000 owners would have, I suspect. Beyond 512K, you run out of address lines on the physical ROM and address space to put it in, so today's machines are basically limited to 512K. > Jim Wright > jwright@atanasoff.cs.iastate.edu -- Dave Haynie "The 32 Bit Guy" Commodore-Amiga "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: D-DAVE H BIX: hazy Amiga -- It's not just a job, it's an obsession
michael@stb.UUCP (Michael) (03/31/89)
Actually, how significant is ROM size as a limit anyways? Just use RAM. Patch some library vectors, install a ROM-TAG to re-do the vectors at every warm boot, presto! No need to hack up some ROM. BTW, can we please see this in 1.4, i.e., if we have a 500 or 2000 with 1.2 roms, how about putting a rom-tag'd patch program in to give us all the 1.4 features without needing new roms? We've got the memory now. Michael : --- : Michael Gersten uunet.uu.net!stb!michael : michael@stb.uu.net <mx mailers> crash!gryphon!denwa!stb!michael : "Robitussin" for computers? This has gone too far. Where's "Penicillian"? : (rob. is Coff-medicine to let COFF people run bsd-dependent GNU stuff).