Article View: comp.sys.mac
Article #16773Re: GetTrapAddress and SetTrapAddress?
From: lsr
Date: Mon, 15 Jun 1987 17:54
Date: Mon, 15 Jun 1987 17:54
25 lines
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1445 bytes
In article <164500037@uiucdcsb> kkim@uiucdcsb.cs.uiuc.edu writes:
>
> Do you mean the LIMIT that the trap dispatch table can address
>locations within a range of only 64K bytes from the beginning of the
>system heap has been LIFTED, and that the format of the trap dispatch
>table has been changed.
On the 128K ROMs or later, the trap table contains a full address pointing
to the trap routine. Therefore the trap routine can be anywhere in memory.
On the older ROMs, the table contained a 16 bit offset from the start of
RAM or ROM; the address of a trap had to be within 64 of the start of RAM or
ROM.
The change in the trap table is discussed in Inside Macintosh volume 4.
--
Larry Rosenstein
Object Specialist
Apple Computer
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!cbosgd!ihnp4!ptsfa!lll-lcc!pyramid!voder!apple!lsr From: lsr@apple.UUCP Newsgroups: comp.sys.mac Subject: Re: GetTrapAddress and SetTrapAddress? Message-ID: <1038@apple.UUCP> Date: Mon, 15-Jun-87 13:54:33 EDT Article-I.D.: apple.1038 Posted: Mon Jun 15 13:54:33 1987 Date-Received: Wed, 17-Jun-87 01:31:51 EDT References: <164500036@uiucdcsb> <164500037@uiucdcsb> Reply-To: lsr@apple.UUCP (Larry Rosenstein) Organization: Advanced Technology Group, Apple Computer Lines: 25