This is an archive containing all of the most popular Macintosh models ROM files for emulation purposes, ranging from the first 64K ROM from the Mac 128K to the 4MB ROM files from the Bandai Pippin or PowerMac G3, listed below in ROM size, then by release date from oldest to newest.

You can refer to this awesome Macintosh models timeline on Wikipedia for old world vs new world ROMS.

The first download contains these Old World Macintosh ROM files:

--- 68K ---

1984-01 - 28BA61CE - Macintosh 128.ROM
1984-10 - 28BA4E50 - Macintosh 512K.ROM

--- 128K ---

1986-01 - 4D1EEEE1 - MacPlus v1.ROM
1986-03 - 4D1EEAE1 - MacPlus v2.ROM
1986-03 - 4D1F8172 - MacPlus v3.ROM

--- 256K ---

1987-03 - 97851DB6 - MacII (800k v1).ROM
1987-03 - B2E362A8 - Mac SE.ROM
1987-12 - 9779D2C4 - MacII (800k v2).ROM
1988-09 - 97221136 - Mac II FDHD & IIx & IIcx.ROM
1989-02 - 96CA3846 - Mac Portable.ROM
1989-08 - B306E171 - Mac SE FDHD.ROM
1991-10 - 96645F9C - PowerBook 100.ROM

--- 512K ---

1989-09 - 368CADFE - Mac IIci.ROM
1990-03 - 4147DD77 - Mac IIfx.ROM
1990-10 - 350EACF0 - Mac LC.ROM
1990-10 - 36B7FB6C - Mac IIsi.ROM
1990-10 - A49F9914 - Mac Classic.rom
1991-10 - 3193670E - Classic II.ROM
1992-03 - 35C28F5F - Mac LC II.ROM

--- 1MB ---

1991-10 - 420DBFF3 - Quadra 700&900 & PB140&170.ROM
1992-03 - 3DC27823 - Quadra 950.ROM
1992-10 - 4957EB49 - Mac IIvx & IIvi or Performa 600.ROM
1992-10 - E33B2724 - Powerbook 160 & 165 & 165c & 180 & 180c.ROM
1992-10 - ECFA989B - Powerbook 210 & 230 & 250.ROM
1993-02 - EC904829 - Mac LC III (older).ROM
1993-02 - ECBBC41C - Mac LC III.ROM
1993-02 - ECD99DC0 - Color Classic.ROM
1993-02 - F1A6F343 - Quadra, Centris 610,650.ROM
1993-02 - F1ACAD13 - Quadra, Centris 610,650,800.ROM
1993-10 - 0024D346 - Powerbook Duo 270C.ROM
1993-10 - EDE66CBD - Color Classic II & LC 550 & Performa 275,550,560 & Macintosh TV.ROM
1993-10 - FF7439EE - LC475,575,Quadra 605,Performa 475,476,575,577,578.ROM
1994-04 - 015621D7 - Powerbook Duo 280 & 280c.ROM
1994-07 - 06684214 - LC,Quadra,Performa 630.ROM
1994-07 - FDA22562 - Powerbook 150.ROM
1995-04 - 064DC91D - LC, Performa 580 & Performa 588.ROM

--- 2MB ---

1994-05 - B6909089 - PowerBook 520 520c 540 540c.ROM
1994-09 - 5BF10FD1 - Quadra 660av & 840av.ROM
1995-08 - 4D27039C - Powerbook 190 & 190cs.ROM

--- 4MB ---

1994-03 - 9FEB69B3 - Power Mac 6100 & 7100 & 8100.ROM
1994-04 - 9C7C98F7 - Workgroup Server 9150 80MHz.ROM
1995-01 - 9B7A3AAD - Power Mac 7100 (newer).ROM
1995-04 - 63ABFD3F - Power Mac & Performa 5200,5300,6200,6300.ROM
1995-04 - 9B037F6F - Workgroup Server 9150 120MHz.ROM
1995-08 - 83C54F75 - Powerbook 2300 & PB5x0 PPC Upgrade.ROM
1995-08 - 9630C68B - Power Mac 7200&7500&8500&9500 v2.ROM
1995-08 - 96CD923D - Power Mac 7200&7500&8500&9500 v1.ROM
1996-08 - 6F5724C0 - PowerMac, Performa 6400.ROM
1996-10 - 83A21950 - PowerBook 1400, 1400cs.ROM
1997-02 - 6E92FE08 - Power Mac 6500.ROM
1997-02 - 960E4BE9 - Power Mac 7300 & 7600 & 8600 & 9600 (v1).ROM
1997-02 - 960FC647 - Power Mac 8600 & 9600 (v2).ROM
1997-11 - 78F57389 - Power Mac G3 (v3).ROM
1997-11 - 79D68D63 - Power Mac G3 desktop.ROM
1998-03 - CBB01212 - PowerBook G3 Wallstreet.ROM
1998-08 - B46FFB63 - PowerBook G3 Wallstreet PDQ.ROM

The second download contains these New World Mac ROMS:

1998-07-21 - Mac OS ROM 1.1.rom
1998-08-27 - Mac OS ROM 1.1.2.rom
1998-12-03 - Mac OS ROM 1.2.rom
1999-01-22 - Mac OS ROM 1.2.1.rom
1999-04-05 - Mac OS ROM 1.4.rom
1999-05-14 - Mac OS ROM 1.6.rom
1999-09-17 - Mac OS ROM 2.5.1.rom
1999-09-27 - Mac OS ROM 3.0.rom
1999-09-28 - Mac OS ROM 1.8.1.rom
2000-03-15 - Mac OS ROM 3.7.rom
2000-05-22 - Mac OS ROM 3.8.rom
2000-11-03 - Mac OS ROM 6.1.rom
2001-02-07 - Mac OS ROM 7.5.1.rom
2001-07-30 - Mac OS ROM 8.4.rom
2001-12-19 - Mac OS ROM 9.0.1.rom
2002-04-08 - Mac OS ROM 9.1.1.rom
2002-09-03 - Mac OS ROM 9.6.1.rom
2003-01-10 - Mac OS ROM 9.8.1.rom
2003-04-03 - Mac OS ROM 10.2.1.rom

Motorola 68K

Architecture: 68K and PPC (mixed)

Emulating this? It should run fine under: Mini vMac