| Author |
Topic |
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scchicago
Full Member
USA
936 Posts |
 Posted - 08 May 2002 : 18:42:01
Is it possible to put more than 10MB of RAM in my LC II.
I'd try it right off bat, but I don't want to damage it.
Is there any way to hack something into it to allow me to have more RAM? I have a couple of 4MB SIMMs the same kind that I use in my LC that I could put in the LC II to make 12MB if possible._________________
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~Coxy
Leader, Tactical Ops Unit
Australia
2822 Posts |
Posted - 08 May 2002 : 18:55:06
If you put in 2 4MB SIMMS, you will still only be able to see and use 10 meg. Unless you like hardware hacking, there's no way to get 12 meg for use.~Coxy - Leader, Tactical Operations Unit
Mayor of NuBus City
 |
TiMacLover
Senior Member
USA
1282 Posts |
Posted - 08 May 2002 : 20:23:25
Thanks to who ever caught those posts!Jeremy "I'll see you on the Dark Side Of The Moon" - Pink Floyd Covert Ops
68k Hacks General 
Macs Liberated:18
ENTER THROUGH THE GATES |
~Coxy
Leader, Tactical Ops Unit
Australia
2822 Posts |
Posted - 08 May 2002 : 21:40:37
Yeah, that was me.  ~Coxy - Leader, Tactical Operations Unit
Mayor of NuBus City
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maclover5
LC Doctor/Hot Rodder
Australia
5830 Posts |
Posted - 09 May 2002 : 00:08:01
quote:
If you put in 2 4MB SIMMS, you will still only be able to see and use 10 meg. Unless you like hardware hacking, there's no way to get 12 meg for use.~Coxy - Leader, Tactical Operations Unit
Mayor of NuBus City
Exactly. Unfortunately, anything even resembling this would probably require you to reprogram the ROMs, which is a very hard thing to do. The ROMs are probably programmed to disable the lower two megs of ram on the mobo. -------------------------- Pizzabox LCs RULE!!!!!!! Warrior maclover5
68k Macintosh Liberation Army
Number of 68ks Liberated: 6
|
Flash
Full Member
Australia
637 Posts |
Posted - 09 May 2002 : 02:12:17
quote:
The ROMs are probably programmed to disable the lower two megs of ram on the mobo.
More to the point, the ROM's were never programmed to address more than 10MB. If you threw in 16MB simms, the Mac still wouldn't address more than 10MB - the Mac just doesn't know the extra RAM is even there - see what i mean? I guess nobody thought in those days that we would ever need more RAM! 68k MLA ParaMedic |
Rexzilla
Junior Member
132 Posts |
Posted - 09 May 2002 : 02:53:22
That is why I have a stack of LCIIs in the closet...sigh...
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maclover5
LC Doctor/Hot Rodder
Australia
5830 Posts |
Posted - 09 May 2002 : 05:48:41
quote:
quote:
The ROMs are probably programmed to disable the lower two megs of ram on the mobo.
More to the point, the ROM's were never programmed to address more than 10MB. If you threw in 16MB simms, the Mac still wouldn't address more than 10MB - the Mac just doesn't know the extra RAM is even there - see what i mean? I guess nobody thought in those days that we would ever need more RAM! 68k MLA ParaMedic
Uh huh! -------------------------- Pizzabox LCs RULE!!!!!!! Warrior maclover5
68k Macintosh Liberation Army
Number of 68ks Liberated: 6
|
Trash80toG-4
NIGHT STALKER
USA
2899 Posts |
Posted - 09 May 2002 : 08:08:54
quote:
quote:
quote:
The ROMs are probably programmed to disable the lower two megs of ram on the mobo.
More to the point, the ROM's were never programmed to address more than 10MB. If you threw in 16MB simms, the Mac still wouldn't address more than 10MB - the Mac just doesn't know the extra RAM is even there - see what i mean? I guess nobody thought in those days that we would ever need more RAM! 68k MLA ParaMedic
Uh huh!
Uh huh! *where have i heard that before?*thank your lucky stars it was a 10 Megabyte address ceiling. the guys who built the wire wrap prototypes of the IBM PC couldn't conceive of anybody ever needing to address more than 640 Kilobytes of RAM! the IBM architecture was open enough and the market was big enough that lots of workarounds were developed. the only case of that happening in the Mac world that i recall was Connectix' reaming of apple for an undisclosed amount with the MODE 32 software patent! *yay! way to go connectix! f***'**!* jt  ™. . Edited by - Trash80toG-4 on 09 May 2002 08:11:33 |
G4from128k
Full Member
USA
873 Posts |
Posted - 09 May 2002 : 08:09:02
How to get an LC II to recognize more RAM, Hmmm. Since the LC II has a PMMU (built into the 68030) you could could run virtual memory if only you could have a fast enough disk drive. A SCSI silicon RAM disk should create a moderately spunky swap space for VM-based operations. It might not let you work on a 100 MB photoshop image, but it would let load and use a variety of applications simultaneously (no ROM reprograming needed). I do remember, back in the early 90s, that some companies developed and marketed silicon RAM disks (touting submillisecond access times and throughput to the limit of bus interface.) Could be an interesting uber-hacker project to recreate one of these things.Happy Hacking, G4from128k ------------
Two wrongs don't make a right, but three lefts do. |
maclover5
LC Doctor/Hot Rodder
Australia
5830 Posts |
Posted - 09 May 2002 : 22:09:15
quote:
thank your lucky stars it was a 10 Megabyte address ceiling. the guys who built the wire wrap prototypes of the IBM PC couldn't conceive of anybody ever needing to address more than 640 Kilobytes of RAM!
"640k outta be enough for anybody" - Bill Gates (i think it was him, anyway.  ) -------------------------- Pizzabox LCs RULE!!!!!!! Warrior maclover5
68k Macintosh Liberation Army
Number of 68ks Liberated: 6
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12MB RAM in LC II
68k of the Week: kastegir's PowerBook 180.