mapROM eats too much RAM

alphonsus · 09 July 2008, 02:12

I've enabled mapROM on my A1200's BlizzPPC.
I loose 1 MB of RAM in the process.
I'm sure the A1200 ROM is only 512 kB.

Any ideas what's going on?
(And whether or not it's worth it, especially given the extra reset it seems to require).

coze · 09 July 2008, 02:36

why do you think you loose 1mb RAM ? what are the values before and after enabling ?

rkauer · 09 July 2008, 03:40

Do you use OS3.9? If so, MAPROM is useless. It just eat the RAM memory doing nothing.

thomas · 09 July 2008, 09:22

Quote:

Originally Posted by rkauer

Do you use OS3.9? If so, MAPROM is useless. It just eat the RAM memory doing nothing.

Why should it be useless ? OS 3.9 only updates a few ROM modules. Those modules which are not updated are still used from the ROM and will be sped up by mapping the ROM to Fast-RAM.

rkauer · 09 July 2008, 09:41

Quote:

Originally Posted by thomas

Why should it be useless ? OS 3.9 only updates a few ROM modules. Those modules which are not updated are still used from the ROM and will be sped up by mapping the ROM to Fast-RAM.

OK, but then is more easy to just add "CPU fastROM" command in earlier the startup-sequence than enabling a jumper who puts everything (including the old modules) in RAM.

Jope · 09 July 2008, 10:12

Perhaps the ROM is being mapped twice. Once automatically by the Blizzard and then a second time by a piece of software in startup-sequence?

Mad-Matt · 09 July 2008, 10:32

I suspect the bppc cards own rom files are also being mapped to fastram too inside that 1mb as well as lookup tables and such for operation of the ppc part. been a while since i checked bt im sure some memory was lost by default without maprom in operation.

alphonsus · 09 July 2008, 17:46

With 2 8Mb simms I get 15Mb with maprom enabled and 16Mb without.
Does the romupdate load all of the patched rom to ram?

thomas · 09 July 2008, 22:55

Quote:

Originally Posted by rkauer

OK, but then is more easy to just add "CPU fastROM" command in earlier the startup-sequence than enabling a jumper who puts everything (including the old modules) in RAM.

MapROM is not a jumper, it's an option in the firmware menu.

Quote:

Does the romupdate load all of the patched rom to ram?

It loads Devs:AmigaOS ROM Update into RAM and changes library pointers which are in RAM anyway. It does not occupy another 512KB if that's what you mean. It does not patch the ROM code.

NovaCoder · 10 July 2008, 01:16

Quote:

Originally Posted by rkauer

OK, but then is more easy to just add "CPU fastROM" command in earlier the startup-sequence than enabling a jumper who puts everything (including the old modules) in RAM.

Ok so do turn off my map rom jumping and use this 'CPU FastROM' command instead? Or do I install Blizzkick and use that with the jumping?

I'm using a Blizz 030 running OS3.9

09 July 2008, 02:12	#1
alphonsus Registered User Join Date: Apr 2008 Location: UK Age: 50 Posts: 181	mapROM eats too much RAM I've enabled mapROM on my A1200's BlizzPPC. I loose 1 MB of RAM in the process. I'm sure the A1200 ROM is only 512 kB. Any ideas what's going on? (And whether or not it's worth it, especially given the extra reset it seems to require).

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09 July 2008, 02:36	#2
coze hastala vista winny vista Join Date: Feb 2006 Location: mt fuji Age: 46 Posts: 1,335	why do you think you loose 1mb RAM ? what are the values before and after enabling ?

09 July 2008, 03:40	#3
rkauer I hate potatos and shirts Join Date: Oct 2007 Location: Sao Leopoldo / Brazil Age: 58 Posts: 3,482	Do you use OS3.9? If so, MAPROM is useless. It just eat the RAM memory doing nothing.

09 July 2008, 10:12	#6
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,900	Perhaps the ROM is being mapped twice. Once automatically by the Blizzard and then a second time by a piece of software in startup-sequence?

09 July 2008, 10:32	#7
Mad-Matt Longplayer Join Date: Jan 2005 Location: Lincoln / UK Age: 45 Posts: 1,853	I suspect the bppc cards own rom files are also being mapped to fastram too inside that 1mb as well as lookup tables and such for operation of the ppc part. been a while since i checked bt im sure some memory was lost by default without maprom in operation.

09 July 2008, 17:46	#8
alphonsus Registered User Join Date: Apr 2008 Location: UK Age: 50 Posts: 181	With 2 8Mb simms I get 15Mb with maprom enabled and 16Mb without. Does the romupdate load all of the patched rom to ram?

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