Iisi issue

[imactheknife]

Feeling lazy tonight lol.. so picked up a iisi logic with rom simm slot. It has rom on board as well. It is recapped, nothing major that i could see. It turns on, chimes and then gets death chimes. Screen comes on for a second when first turned on, then nothing, stays black.

On a side note: will an apple se/30 rom simm work in the iisi? Thanks for any info, and excuse my laziness in searching!

 

[croissantking]

Feeling lazy tonight lol.. so picked up a iisi logic with rom simm slot. It has rom on board as well. It is recapped, nothing major that i could see. It turns on, chimes and then gets death chimes. Screen comes on for a second when first turned on, then nothing, stays black.

On a side note: will an apple se/30 rom simm work in the iisi? Thanks for any info, and excuse my laziness in searching!

Might be bad ram.
SE/30 rom won’t boot a IIsi.

 

[imactheknife]

Might be bad ram.
SE/30 rom won’t boot a IIsi.

Will iivx onboard ram be the same? I assume it would be. I also have a spare classic board around and a duo 210 board.

 

[mikes-macs]

So on the Mac IIsi there need to be a jumper on W1. This will disable the onboard ROM and allow the use of the ROM SIMM

https://www.bigmessowires.com/romdrv/rominatorii-instructions.pdf

Is your ROM SIMM a genuine Apple ROM or Custom ROM?

 

[imactheknife]

So on the Mac IIsi there need to be a jumper on W1. This will disable the onboard ROM and allow the use of the ROM SIMM

https://www.bigmessowires.com/romdrv/rominatorii-instructions.pdf

Is your ROM SIMM a genuine Apple ROM or Custom ROM?

Only rom i have is a se/30 rom which i guess wont work. So back to checking bad ram first.

 

[croissantking]

Will iivx onboard ram be the same? I assume it would be. I also have a spare classic board around and a duo 210 board.

IIvx has 4MB onboard (512k per chip) so is not the same since the IIsi has 1MB.

The Classic has the same 1MB onboard (128k per chip).

FYI you can upgrade the IIsi to 4MB so you could use the IIvx as a donor if you change all the chips.

So on the Mac IIsi there need to be a jumper on W1. This will disable the onboard ROM and allow the use of the ROM SIMM

https://www.bigmessowires.com/romdrv/rominatorii-instructions.pdf

Is your ROM SIMM a genuine Apple ROM or Custom ROM?

He doesn’t have a rom simm, he said it is onboard.

 

[imactheknife]

Some pictures..

 

[imactheknife]

IIvx has 4MB onboard (512k per chip) so is not the same since the IIsi has 1MB.

The Classic has the same 1MB onboard (128k per chip).

FYI you can upgrade the IIsi to 4MB so you could use the IIvx as a donor if you change all the chips.


He doesn’t have a rom simm, he said it is onboard.

Oh interesting. So i do have a donar iivx board. So can definitely upgrade the memory

 

[croissantking]

Oh interesting. So i do have a donar iivx board. So can definitely upgrade the memory

Yep. Not saying it’ll fix the death chimes but since you’re changing chips anyway you might as well upgrade.

Some discussion here:

Upgrading IIsi onboard RAM to 4MB

The Mac IIsi motherboard is wired for a 1 MB onboard RAM array using eight 256kx4 DRAM chips or a 4 MB RAM array using eight 1Mx4 chips. After discovering this on my broken IIsi, I was able to simply replace the eight RAM chips with larger 1Mx4 RAMs (e.g. KM44C1000, M5M44400, MT4C4001) and get 4...

tinkerdifferent.com

 

[imactheknife]

Yep. Not saying it’ll fix the death chimes but since you’re changing chips anyway you might as well upgrade.

Some discussion here:

Upgrading IIsi onboard RAM to 4MB

The Mac IIsi motherboard is wired for a 1 MB onboard RAM array using eight 256kx4 DRAM chips or a 4 MB RAM array using eight 1Mx4 chips. After discovering this on my broken IIsi, I was able to simply replace the eight RAM chips with larger 1Mx4 RAMs (e.g. KM44C1000, M5M44400, MT4C4001) and get 4...

tinkerdifferent.com

Oh ok, i remember that thread now. I actually commented on it lol.. so yeah will see.

 

[mikes-macs]

Oh I missed that part, thought the SIMM was populated.