This section documents miscellaneous other changes in RISC OS 3.7
that are not directly related to the need to support StrongARM.

The Kernel
==========
The System ROM is now marked read-only in the MMU page tables of machines
with an ARM7 or later processor. Attempts to write to ROM space will cause
a data abort.

The kernel is now aware of multiple applications (see below).

FileSwitch
==========
FileSwitch now supports 2048-byte buffers (see FSEntry_Open on
page 2-531).

The Window Manager
==================
The Window Manager has now delegated application memory management
to the kernel. The kernel is now aware of multiple application memory
blocks (AMBs) and pages them in and out when requested by the Window
Manager. This improves task switching performance, as the kernel is
able to remap AMBs far faster than the Window Manager was able to
using OS_SetMemMapEntries.

The Font Manager
================
The Font Manager now supports background blending in modes with
256 colours or more. This blending causes the anti-aliased pixel
data to be blended with the background colour rather than using the
fixed colour specified in the various colour setting SWIs.

To use the blending, you should set bit 11 of R2 in the call to Font_Paint.
However, you need to ensure the following:

    1) The font colours specify that there is >= 1 anti-aliasing colour,
       otherwise the Font Manager will attempt to paint from 1bpp cache
       data rather than the 4bpp anti-aliased data.
    
    2) The Font Manager you are calling supports this bit, as previous
       versions of the Font Manager will complain if they find this bit
       set. You should call Font_CacheAddr to check the version of
       the Font Manager your application is running on, and only set
       the bit on Font Manager 3.35 or later.

There is a noticeable speed hit in using blending, so you should not
use it if you know you are plotting onto a uniform background.

Debugger
========
SWI Debugger_Disassemble is now aware of the complete ARMv4 instruction
set.

Note that the LDRH, LDRSH and STRH instructions are not supported by the
Risc PC memory system; although they will often work in a cached area
because memory is accessed a 4 or 8 words at a time, they will not work
reliably. LDRSB, MULL and MLAL may be freely used (except of course they
won't be backwards-compatible). 

Econet
======
A StrongARM-compatible Econet module has been placed in the System ROM,
rather than the RiscPC/A7000 Econet card firmware being upgraded.

The Internet module
===================
The Internet module supplied with RISC OS 3.70 is a major new version
based on FreeBSD, a 4.4BSD-derived Unix. It offers improved performance,
and a wider API, including support for multicasting and T/TCP. All calls
documented in chapter 123 of the Programmer's Reference Manual continue
to work as documented, but some of the lower-level socketioctl calls,
particularly those to do with route manipulation have been withdrawn.
More details will be made available later.

A revised !Internet application is supplied as part of the !Boot structure
and a new application provides an easy interface for configuring the
various networking components built in to RISC OS 3.7

Access
======
Access Plus is now in the System ROM, instead of being supplied in the
System application on the hard disc.

AUN
===
A new subreason code of Service_InternetStatus has been added;
Service_InternetStatus 1 is issued when the Net module receives a
network map from a gateway station.

