Subject: Re: Building a Kernel for Classic II
To: Andrew Foakes <netbsd@foakes.demon.co.uk>
From: Paul Goyette <paul@whooppee.com>
List: port-mac68k
Date: 08/25/1998 13:03:59
On Tue, 25 Aug 1998, Andrew Foakes wrote:
> System RAM: 10452992 bytes in 2552 pages.
> Low = 0x0, high = 0x9f8000
> no internal video at address 0 -- videoaddr is 0xfee09a80
>
> But then nothing and I have to hit the bong button.
>
> [I assume the memory information is correct - 10Mb of memory with the
> 512x342 display at the top ending at the highest byte. Why is high less
> than start of video? - I knew this once but have forgotten. Is something
> mapping here?]
Classic II appears to "pretend" that on-board video is in NuBus slot
0xe, hence the videoaddr address of 0xfee90a80. This is a common thing
in several Mac models.
-----------------------------------------------------------------------------
| Paul Goyette | Public Key fingerprint: | E-mail addresses: |
| Network Engineer | 0E 40 D2 FC 2A 13 74 A0 | paul@whooppee.com |
| and kernel hacker | E4 69 D5 BE 65 E4 56 C6 | paul.goyette@ascend.com |
-----------------------------------------------------------------------------