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Apple Macintosh · ROM Version Numbers

This article explains how to determine the ROM version of a Macintosh computer. Additional information on Macintosh ROMs (various size) can be found bellow: Macintosh: ROM Size for Various Models

To find the ROM revision of a computer not listed in this article, use one of the following two described methods.

Apple System Profiler is the easiest. Launch the program and under the System Profile tab, look in the Production information section for the ROM revision.

Alternatively, you can use the Programmer's Interrupt Switch to determine the ROM version number of your Macintosh Computer.
    1. Press the programmer's interrupt switch, or use the keyboard equivalent.

    2. Type: DM 2AE

    3. Press return.

    • This displays the ROMbase global which is located at memory address $0002AE. The ROMbase global is the number located in offset 0 and 2. For example, a Quadra 660AV displays: 4080 0000 XXXX XXXX XXXX XXXX XXXX XXXX

    4. Type the ROMbase global. EXAMPLE: DM 40800000. The result is 5BF1 0FD1 0000 002A 077D XXXX XXXX XXXX

    5. The machine type and ROM version are at offset 8 or 077D in this case which is from a 660av Macintosh Computer. You could also add the 8 bytes to the memory address and have done DM 40800008 and the first two bytes would be the type and ID.


Macintosh ROM Version Table
System Machine Type ROM version
Macintosh 128K 0
Macintosh 512K 0
Macintosh 512Ke 0 75
Macintosh Plus 0 75
Macintosh SE 2 76
Macintosh SE/30 1 78
Macintosh Classic 2 76
Macintosh Classic II 6 7C
Macintosh Color Classic 6 7C
.
Macintosh LC 6 7C
Macintosh LC II 6 7C
Macintosh LC III 6 7C
Macintosh LC 520 6 7C
Macintosh LC 550 6 7C
Macintosh LC 575 6 7C
Macintosh LC 475 6 7C
Macintosh LC 580 6 7C
Macintosh LC 630 6 7C
Macintosh TV 6 7C
.
Performa 200 6 7C
Performa 400, 405, 410, 430 6 7C
Performa 460, 466, 467 6 7C
Performa 475, 476 6 7C
Performa 550, 560 6 7C
Performa 575, 578, 580 6 7C
Performa 600, 600CD 6 7C
Performa 630, 631, 635, 636, 637, 638 6 7C
Performa 5200, 5215 7 7D
Performa 5260, 5300, 5320 7 7D
Performa 6110,6112,6115,6116,6117,6118 7 7D
Performa 6200,6205,6214,6216,6218,6220 7 7D
Performa 6230, 6290, 6300, 6310, 6320 7 7D
Performa 6360 7 7D
Performa 6400 7 7D
.
Macintosh II 1 78
Macintosh IIx 1 78
Macintosh IIcx 1 78
Macintosh IIci 6 7C
Macintosh IIsi 6 7C
Macintosh IIfx 6 7C
.
Macintosh Centris 610 6 7C
Macintosh Centris 650 6 7C
Macintosh Centris 660AV 7 7D
.
Macintosh Quadra 605 6 7C
Macintosh Quadra 610 6 7C
Macintosh Quadra 630 6 7C
Macintosh Quadra 650 6 7C
Macintosh Quadra 660AV 7 7D
Macintosh Quadra 700 6 7C
Macintosh Quadra 800 6 7C
Macintosh Quadra 840AV 7 7D
Macintosh Quadra 900 6 7C
Macintosh Quadra 950 6 7C
.
Macintosh Portable 3 78
PowerBook 100 3 7A
PowerBook 140 6 7C
PowerBook 145 6 7C
PowerBook 145B 6 7C
PowerBook 150 6 7C
PowerBook 160 6 7C
PowerBook 165 6 7C
PowerBook 165c 6 7C
PowerBook 170 6 7C
PowerBook 180 6 7C
PowerBook 180c 6 7C
PowerBook 190 7 7D
PowerBook Duo 210 6 7C
PowerBook Duo 230 6 7C
PowerBook Duo 250 6 7C
PowerBook Duo 270c 6 7C
PowerBook Duo 280 6 7C
PowerBook Duo 280c 6 7C
PowerBook Duo 2300 7 7D
PowerBook 520 6 7C
PowerBook 520c 6 7C
PowerBook 540 6 7C
PowerBook 540c 6 7C
PowerBook 5300 7 7D
.
Power Macintosh 4400/200 7 7D
Power Macintosh 5200/75 LC 7 7D
Power Macintosh 5300/100 LC 7 7D
Power Macintosh 5260/100 7 7D
Power Macintosh 5400/120 7 7D
Power Macintosh 5500/225 7 7D
Power Macintosh 6100 Series 7 7D
Power Macintosh 6500/225 & 6500/250 7 7D
Power Macintosh 7100 Series 7 7D
Power Macintosh 7200 Series 7 7D
Power Macintosh 7300 Series 7 7D
Power Macintosh 7500 Series 7 7D
Power Macintosh 7600 Series 7 7D
Power Macintosh 8100 Series 7 7D
Power Macintosh 8500 Series 7 7D
Power Macintosh 8600 Series 7 7D
Power Macintosh 9500 Series 7 7D
Power Macintosh 9600 Series 7 7D



Notes:

1. The ROM version does not necessarily reflect slight differences in ROM sets. For example, the Macintosh IIfx ROMs are slightly different from the Macintosh IIci ROMs, even though the ROM version number is the same.

2. With the Centris 660AV and Quadra 840AV, a new 2 MB ROM was introduced.


Macintosh · ROM Size for Various Models

Macintosh Model ROM Size
Macintosh 128 64K
Macintosh 512K 64K
Macintosh 512Ke 128K
Macintosh Plus 128K
Macintosh SE (both 800K & FDHD) 256K
Macintosh Classic (4-chip and 2-chip) 512K
Macintosh SE/30 256K
Macintosh Classic II 512K
Macintosh Color Classic 1024K


Macintosh II Models ROM Size
Macintosh II 256K
Macintosh IIx 256K
Macintosh IIcx 256K
Macintosh IIci 512K
Macintosh IIfx 512K
Macintosh IIsi 512K
Macintosh IIvi/IIvx 1024K


Macintosh LC Models
Macintosh LC
Macintosh LC II 512K
Macintosh LC III 1024K
Macintosh LC 475 1024K
Macintosh LC 520/550 1024K
Macintosh LC 575 1024K
Macintosh LC 580 1024K
Macintosh LC 630 1024K
Macintosh TV 1024K


Macintosh Performa Models
Macintosh Performa 200 512K
Macintosh Performa 400/405/410/430 512K
Macintosh Performa 450/460/466/467 1024K
Macintosh Performa 475/476 1024K
Macintosh Performa 550/560 1024K
Macintosh Performa 575/577/578 1024K
Macintosh Performa 580 1024K
Macintosh Performa 600 1024K
Macintosh Performa 630/631/635/636/637/638/640 1024K
Macintosh Performa 5200/5210/5215/5220 4096K
Macintosh Performa 5260 4096K
Macintosh Performa 5300 4096K
Macintosh Performa 6100 Series 4096K
Macintosh Performa 62xx 4096K
Macintosh Performa 6300 4096K
Macintosh Performa 6320 4096K
Macintosh Performa 6400 series 4096K
Macintosh Performa 6360 4096K
Macintosh Performa 6290 4096K
Macintosh Quadra Models
Macintosh Quadra 605 1024K
Macintosh Centris/Quadra 610 1024K
Macintosh Quadra 630 1024K
Macintosh Centris/Quadra 650 1024K
Macintosh Quadra 700 1024K
Macintosh Quadra 800 1024K
Macintosh Quadra 900 1024K
Macintosh Quadra 950 1024K
Macintosh Centris/Quadra 660AV 1024K
Macintosh Quadra 840AV 2048K


Apple Workgroup Servers
Apple Workgroup Server 60 1024K
Apple Workgroup Server 80 1024K
Apple Workgroup Server 90 1024K
Apple Workgroup Server 95 1024K
Apple Workgroup Server 6150 4096K
Apple Workgroup Server 8150 4096K
Apple Workgroup Server 9150 4096K
Apple Workgroup Server 7250 4096K
Apple Workgroup Server 8550 4096K


Power Macintosh Models
Power Macintosh 4400 series 4096K
Power Macintosh 5200/75 LC 4096K
Power Macintosh 5260/100 4096K
Power Macintosh 5300/100 LC 4096K
Power Macintosh 5400 series 4096K
Power Macintosh 5500 series 4096K
Power Macintosh 6400 series 4096K
Power Macintosh 6500 series 4096K
Power Macintosh 6100 series 4096K
Power Macintosh 7100 series 4096K
Power Macintosh 7200 series 4096K
Power Macintosh 7300 series 4096K
Power Macintosh 7500/100 4096K
Power Macintosh 7600 series 4096K
Power Macintosh 8100 series 4096K
Power Macintosh 8500 series 4096K
Power Macintosh 8600 series 4096K
Power Macintosh 9500 series 4096K
Power Macintosh 9600 series 4096K
Power Macintosh G3 4096K
Power Macintosh G3 (Blue and White) 1024K


Macintosh PowerBook Models
Macintosh Portable 256K
Macintosh Backlit Portable 256K
PowerBook 100 256K
PowerBook 140 1024K
PowerBook 145 1024K
PowerBook 150 1024K
PowerBook 160 1024K
PowerBook 165c 1024K
PowerBook 170 1024K
PowerBook 180/180c 1024K
PowerBook Duo 210 1024K
PowerBook Duo 230 1024K
PowerBook Duo 250 1024K
PowerBook Duo 270c 1024K
PowerBook Duo 280/280c 1024K
PowerBook 520/520c 2048K
PowerBook 540/540c 2048K
PowerBook 1400 1024K
PowerBook Duo 2300 series 4096K
PowerBook 5300 series 4096K


If you have extra info about this page, if you noticed errors, please help me to maintain this site. Send me the information you have, I will update the page as soon as possible. Thank you in advance.


 
 

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