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SystemGuide/index.html
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<p><strong>RomWBW System Guide</strong> \
Version 3.6 \
Wayne Warthen (<a href="mailto:wwarthen@gmail.com">wwarthen@gmail.com</a>) \
21 Jul 2025</p>
29 Jul 2025</p>
<h1 id="overview">Overview</h1>
<p>The objective of RomWBW is to provide firmware, operating systems, and
applications targeting the Z80 family of CPUs. The firmware, in the form
@@ -4777,15 +4777,15 @@ Sound Unit (C). The frequency is standardized and is specified by using
values that correspond to musical notes. The frequency will be applied
when the next SNDPLAY function is invoked. The returned Status (A) is a
standard HBIOS result code.</p>
<p>The Note (HL) values correspond to eighth notes. Increasing/decreasing
the value by 8 results in a full note increment/decrement.<br />
<p>The Note (HL) values correspond to eighth tones. Increasing/decreasing
the value by 8 results in a full tone increment/decrement.<br />
Increasing/decreasing the value by 48 results in a full octave
increment/decrement. The value 0 corresponds to Bb/A# in octave 0.</p>
<p>The sound chip resolution and its oscillator limit the range and
accuracy of the notes played. The typical range of the AY-3-8910 is six
octaves: Bb2/A#2 to A7, where each value is a unique tone. Values above
and below can still be played but each eighth tone step may not result
in a note change.</p>
in a tone change.</p>
<p>The following table shows the mapping of the Note (HL) value to the
corresponding octave and note.</p>
<table>
@@ -5304,8 +5304,8 @@ Disk Device (DIODEVICE)</a></p>
and the slice parameter ignored. If there is no media in device, or the
slice number is invaid (Parameter Out Of Range) the function will return
an error status.</p>
<p>**NOTE: This function was placed in HBIOS to be shared between the
diffeent CP/M varients supported by RomWBW. It is not strictly a BIOS
<p><strong>NOTE:</strong> This function was placed in HBIOS to be shared between the
different CP/M variants supported by RomWBW. It is not strictly a BIOS
function, and may be moved in future.</p>
<h2 id="system-sys">System (SYS)</h2>
<h3 id="function-0xf0-system-reset-sysreset">Function 0xF0 – System Reset (SYSRESET)</h3>