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SBL6.01 Readme
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[Updates]

(1) Replaced the LIBRARY\SBL6\SEGASMP\LIB\SATURN.LNK with updated GCC link file.

(2) The SBL 6.0 Scroll Library was partially updated to correct an address error bug. An
illegal access occurred at 0x00000000 when the V-Blank IN interrupt service took place during initialization. The bug fix consisted of a routine to check the pointer to see whether it is in NULL condition or not.  The file used to update SBL6.0 was SCL0403.zip (97 KB) which was previously on the DTS Website.

(3) The SND Library (version 1.08) in SBL 6.0 was updated to change a dummy read from 0 to 6000000.  The file used to update SBL 6.0 was SND0108.zip (37 KB) which was previously on the DTS Website.


[Overview]

The Sega Basic Library (SBL) is a low-level library which can be 
applied to many uses.  This library enabled developers the 
flexibility they needed to create their own customized 
applications. However, past versions of SBL were not helpful for 
the development of 3D graphics-based software.

The Sega Game Library (SGL) is a high-level library which can be 
used mainly for 3D graphics applications.  However, depending on 
the application, the developers are forced to deal with many of 
its restrictions.

The objective of SBL6.0 is to integrate the positive aspects of 
both libraries.  SBL6.0 provides developers the flexibility of 
customizing their applications as with the old SBL, along with 
taking advantage of the benefits provided by the expanded features 
ported from SGL.

[Features]

It is possible to combine the features from SBL and SGL.*

By skillfully utilizing SBL and SGL according to the needs of the 
application, the developer can develop software quickly and 
efficiently.  For example, although basic hardware-level control 
functions were provided by previous versions of SBL, the user had 
to bear the overhead of coming up with a efficient polygon 
rendering engine.  In contrast, while SGL has a powerful polygon 
3D engine, there are weaknesses in its support for the Saturn's 
scroll functions due to the its original design implementation.

SBL6.0 provides a development environment with high efficiency and 
flexibility in order to compensate for the deficiencies found in 
both SBL and SGL.

* Keep in mind that limitations will inevitably appear when
  SBL and SGL are combined.

[Functions]

SBL6.0 marries together the low-level control over hardware found 
in previous versions of SBL and the expanded, user-friendly 
features of SGL that almost eliminate the need to deal with the 
complexity of the Saturn's hardware.

The major functions ported from SGL are as follows:

1. High speed high-level 3D graphics control functions.

For example, by using these functions, programmers who are 
relatively inexperienced in 3D graphics can start developing games 
quickly using 3D polygons.

2. Event control function

Animation control over characters, etc., can be easily managed by 
using SGL's event control functions,

