Anyone come across this ROM before? iisi 512k 4 chip simm

[jajan547]

So I know the iisi, SE/30, and iiFX Have similar ROMs but this 512k example I cannot find online anywhere or that exact ROM version. I may be wrong but just wanted to see if it's something weird and known or if its just a normal ROM.

 

[Phipli]

Can you rip it? Get an image?

 

[jajan547]

I don't want to damage it I'm bad at reattaching chips with pins this close, I'd happily ship it for someone to rip. Is it strange at all?

 

[jajan547]

ROMs are below, I've seen a few IIFX ROMs with the same board but these chips are different from any I've seen specifically the ROM images on them.

• LL
  • 341S0820
• ML
  • 341S0821
• MH
  • 341S0822
• HH
  • 341S0823

 

[Phipli]

Can't you rip a ROM from the host machine? I've never needed to

@cheesestraws @Bolle

 

[David Cook]

Can't you rip a ROM from the host machine? I've never needed to

@cheesestraws @Bolle

Yes. Obtain a ROM grabbing program from https://www.macintoshrepository.org/1015-rom-grabbers-for-old-school-macs

Install your ROM simm in your 68k Mac. Run the program CopyROM (after unstuffing the SIT) to obtain the checksum and version information, as well as to copy the ROM from the chips to your disk.

The following page lists all the known ROMs with their checksums and versions. You can determine whether your ROM is a special variant.

Mac Technical Notes [MESS]

mess.redump.net

- David

 

[jajan547]

I'll give this a go tonight, will report back tonight.

 

[mikes-macs]

Yes, I have two of these ROM SIMMs. There're not exactly identical. They work in both IIsi and SE/30s. Haven't noticed anything unordinary.

 

[jajan547]

Yeah I realize that now, thanks for the photos too.

 

[Phipli]

My mother always said its not what you look like, its what's inside that counts.

Use a ROM ripping program to download the contents while booted from them and generate a checksum to see what they are. My bet is they're SE/30 ROMs. A clue would be do they support 32bit addressing without help? If not, they're probably from an SE/30.

 

[mg.man]

ROMs are below

According to this...

RAM & ROM IC Numbers

9/11/99 ***** RAM & ROM IC NUMBERS ***** simm size...pins..IC's...IC part number....IC mfg *** 30PIN *** 256Kb........30....8........D41256-15.......NEC 256Kb........30....8.......M5M4256J-15......(Japan) 256Kb........30....8........M41256A.........OKI 1Mb..........30....2+....HYB514400BJ...

wiki.preterhuman.net

It's for a IIsi. YMMV

 

[mg.man]

This seems to concur...

Mac SE/30 with Upgraded ROM | Big Mess o' Wires

www.bigmessowires.com

...but... this has different info listed for the IIsi

http://bitsavers.org/pdf/apple/mac/mess/Mac_Technical_Notes.html

2 out of 3 = IIsi?

 

[jajan547]

I’d assume iisi hence the date code in the back mid-late 1990. Still a bit strange I know these pop up But don’t see as many.

 

[Phipli]

Interesting. Many IIsi have soldered ROM. The IIsi SIMM ROM were a popular upgrade to make an SE/30 32bit clean. The 90s equivalent to a ROMinator II.

 

[mikes-macs]

Yes they both arrived in Mac Iisi computers. 32 bit clean. One of the Iisi has no soldered ROM. A jumper is on the pins instead.