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#1 2014-06-10 21:31:17

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Dougg3 Hack ROM simm for your IIx - IIfx - IIcx - IIci - IIsi - SE/30

http://www.downtowndougbrown.com/progra … rom-simms/

( to buy )


Because you can do all kinds of crazy things, like Boot Mac OS7 Right from rom… With app and games in there too!
- Will Give you a Clean 32 Bit rom.
- Allows customizations like Disable Ram Check… so you dont have to sit there for 30 − 60 seconds while the machine
checks all 64 or 128 megs of ram.
- You can change the Mac Start Tone!  To music if you want to!
[youtube]https://www.youtube.com/watch?v=Yen0omvBo2Y[/youtube]

You can even install Rom simm slots, in machines like the LC475 and Quadra 605. ( where the rom simm slot is missing )
- Where hacking these is limited right now, you can ( with this rom ) still disable the Long Ram check!
Witch alone is worth it in my book!

BBraun has been a HUGE help with this project as well!
http://www.synack.net/~bbraun/declrom.html

- all kinds of nifty rom's and info on his site, other really nifty things as well!

Bbraun was also able to install a ROM Simm Slot, in the Quadra 800.
And with a Dougg3 simm… and the right modification,  I Believe 512 megs of ram is possible with the q800.

Pretty awesome indeed.

So if you are ready to take a walk on the wild side…   This is the next thing for you!   :-)

Last edited by uniserver (2014-06-10 21:34:01)


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#2 2014-06-10 21:41:09

LCGuy
Administrator
From: Sydney, Australia
Registered: 2014-05-13
Posts: 855

Re: Dougg3 Hack ROM simm for your IIx - IIfx - IIcx - IIci - IIsi - SE/30

Ahh, yes - I really need to get one of these sometime for the Mac SEx.

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#3 2014-06-10 21:58:23

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Dougg3 Hack ROM simm for your IIx - IIfx - IIcx - IIci - IIsi - SE/30

He charges $30 bucks for a Simm.  ( for the 8meg one )   I Think the 8meg simm is the most fun smile


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#4 2014-06-11 03:40:10

LCGuy
Administrator
From: Sydney, Australia
Registered: 2014-05-13
Posts: 855

Re: Dougg3 Hack ROM simm for your IIx - IIfx - IIcx - IIci - IIsi - SE/30

Yeah, I'm thinking of getting the 8MB one. Stick a IIfx image on it (to make the machine 32 bit clean) as well as a small System 6.0.8 setup with a couple of programs. smile

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#5 2014-08-01 15:09:37

bbraun
Member
Registered: 2014-05-29
Posts: 1,064
Website

Re: Dougg3 Hack ROM simm for your IIx - IIfx - IIcx - IIci - IIsi - SE/30

cc333: you had some questions about the ROM hack to enable 128MB SIMMs on the c/q 610, 650, 800.  In my screenshot here: 650ram.png
The system is using so much RAM because it's got a large RAM disk enabled.  The ROM's memory manager seems to have trouble with actually having 512MB of RAM available, and the system refuses to boot.  You can work around that problem by making a large RAM disk.  It kind of hampers the usability, but it's still neat to have that large a RAM disk.  I haven't gotten around to figuring out exactly what the problem is with the ROM's memory management.  Maybe someday.

I also submitted a patch to netbsd to have a kernel option to have 512MB with stock ROMs when using netbsd, so if you're into running netbsd on these machines, no ROM SIMM necessary.

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#6 2014-08-01 15:21:49

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,020
Website

Re: Dougg3 Hack ROM simm for your IIx - IIfx - IIcx - IIci - IIsi - SE/30

Centris 650 with 512 MB RAM ... whoa! yikes


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
See the restored heroes here.

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#7 2014-08-01 19:10:06

bbraun
Member
Registered: 2014-05-29
Posts: 1,064
Website

Re: Dougg3 Hack ROM simm for your IIx - IIfx - IIcx - IIci - IIsi - SE/30

Yeah, a little hack a did a while back: http://www.synack.net/~bbraun/djmemcrom.html
I just noticed cc333 made the astute observation that most of the RAM in that screenshot was taken up by system software, so thought I'd explain why.

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#8 2014-08-02 01:50:56

dougg3
Member
Registered: 2014-05-27
Posts: 28

Re: Dougg3 Hack ROM simm for your IIx - IIfx - IIcx - IIci - IIsi - SE/30

Might as well make my first post here in this thread :-) That's so awesome that you can use that much RAM. I'm amazed at everything possible with the SIMMs. All I wanted to do was change my startup chime and look what bbraun has turned it into!

Maybe I'll try hacking a SIMM to work with the 840av someday, which I believe bbraun already determined won't be able to do the same 512 MB hack. Not sure what good it would do other than disabling the RAM test, but oh well...

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#9 2014-08-02 17:36:04

bbraun
Member
Registered: 2014-05-29
Posts: 1,064
Website

Re: Dougg3 Hack ROM simm for your IIx - IIfx - IIcx - IIci - IIsi - SE/30

He's alive!  Yeah, as best I can tell, the memory controller in the 660/840av has a max of 32MB banks, so can't fully utilize the 128MB SIMMs.  Since I figured out how to reconfigure the memory controller during boot for netbsd and the 610/650/800, I was going to mess with the 840av in a similar manner, but I'm pretty skeptical at this point.
I don't have any particular projects lined up for the AV ROM but you never know, something might pop up.  It'd also be interesting to see how much addressable ROM space those machines have, and if they're limited to the 2MB of the ROM similar to the earlier 040's, or if it can access more.

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