<?xml version="1.0" ?>
<!DOCTYPE msxconfig SYSTEM 'msxconfig2.dtd'>
<msxconfig>

  <info>
    <manufacturer>Sanyo</manufacturer>
    <code>PHC-23J(B)</code>
    <release_year>1987</release_year>
    <description>A basic blue MSX2...</description>
    <type>MSX2</type>
    <region>jp</region>
  </info>

 <!-- Confirmed (except RAM pattern) by Peter Hanraets on serial number
      61265468
   -->

  <CassettePort/>

  <devices>

    <S1985 id="S1985"> <!-- includes 5 bits mapper-read-back -->
      <sramname>phc-23jb_s1985.sram</sramname>
    </S1985>

    <PPI id="ppi">
      <io base="0xA8" num="8"/> <!-- S-1985 mirrors -->
      <sound>
        <volume>16000</volume>
      </sound>
      <keyboard_type>jp_jis</keyboard_type>
      <has_keypad>true</has_keypad>
      <key_ghosting_sgc_protected>false</key_ghosting_sgc_protected>
      <code_kana_locks>true</code_kana_locks>
      <graph_locks>false</graph_locks>
    </PPI>

    <VDP id="VDP">
      <version>V9938</version>
      <vram>128</vram>
      <io base="0x98" num="8" type="O"/> <!-- S-1985 mirrors -->
      <io base="0x98" num="8" type="I"/> <!-- S-1985 mirrors -->
    </VDP>

    <PSG id="PSG">
      <type>YM2149</type> <!-- in S-1985 MSX-ENGINE -->
      <keyboardlayout>JIS</keyboardlayout>
      <sound>
        <volume>21000</volume>
      </sound>
      <io base="0xA0" num="8" type="IO"/> <!-- S-1985 mirrors -->
      <ignorePortDirections>true</ignorePortDirections> <!-- not sure, but guess based on use of Engine IC -->
    </PSG>

    <RTC id="Real time clock">
      <sramname>phc-23jb.cmos</sramname>
      <io base="0xB4" num="4" type="IO"/> <!-- S-1985 mirrors -->
    </RTC>

    <PrinterPort id="Printer Port">
      <io base="0x90" num="8" type="IO"/> <!-- S-1985 mirrors -->
      <bidirectional>true</bidirectional> <!-- S-1985 feature (but not used, nor implemented) -->
      <unused_bits>0x00</unused_bits>
    </PrinterPort>

    <primary slot="0">
      <ROM id="MSX BIOS with BASIC ROM">
        <rom>
          <filename>phc-23jb_basic-bios2.rom</filename>
          <sha1>4ce41fcc1a603411ec4e99556409c442078f0ecf</sha1>
        </rom>
        <mem base="0x0000" size="0x8000"/>
      </ROM>
    </primary>

    <primary external="true" slot="1"/>

    <primary external="true" slot="2"/>

    <primary slot="3">

      <secondary slot="0">
        <ROM id="MSX Sub ROM">
          <rom>
            <filename>phc-23jb_msx2sub.rom</filename>
            <sha1>fd9fa78bac25aa3c0792425b21d14e364cf7eea4</sha1>
          </rom>
          <mem base="0x0000" size="0x4000"/>
        </ROM>
      </secondary>

      <secondary slot="1"/>

      <secondary slot="2">
        <RAM id="Main RAM">
          <mem base="0x0000" size="0x10000"/>
          <initialContent encoding="hex">0000FFFFFFFF0000</initialContent>
          <!-- on serial number 61265468 the pattern is like this, but after 256 bytes the pattern inverts for another 256 bytes. Then starts again. -->
        </RAM>
      </secondary>

      <secondary slot="3"/>

    </primary>

  </devices>

</msxconfig>
