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

  <info>
    <manufacturer>Spectravideo</manufacturer>
    <code>SVI-728</code>
    <release_year>1984</release_year>
    <description>Basic MSX1 with 64kB RAM, popular in many European contries.</description>
    <type>MSX</type>
    <region>eu</region>
  </info>

<!-- 
Info from serial BI 728053932
see http://bilgisayarlarim.com/Spectravideo/SVI-728/
- says "SVI SPECTRAVIDEO 728 HOME COMPUTER" on the left side of the top of the
  casing
- has a small blue MSX logo on the right side of the casing
- has a black 'expansion' connector
- PSG: GI AY-3-8910A
- CPU: Zilog
- PPI: Mitsubishi M5L8255AP-5
- 1 OKI mask ROM

Info from serial BI 728019657
- says "SVI SPECTRAVIDEO 728 HOME COMPUTER" on the left side of the top of the
  casing
- has a small blue MSX logo on the right side of the casing
- has a black 'expansion' connector
- PSG: GI AY-3-8910A
- CPU: SGS Z8400AB1 Z80ACPU 88442-ITALY
- PPI: Toshiba TMP8255AP-5
- VDP: TMS91xx, because it's using TI TMS4416-15NL VRAMs
- mainboard version: 1.4
- SVI-728 POWER & VIDEO: version 1.2
- 1 OKI M38256-71 mask ROM
- RAM chips: 8x National Semiconductor 8505-350 NMC3764N-20
Ident says:
- TMS91xx (no 4/16k effect, no address latch, clones, screen 2 mirrored mode,
  mode 3 mixed mode)
- Z80 scf: 01ED29ED
- Z80 out (c),0: 0 (MSX)
- PSG mask: AY8910

Info from serial BI 728002545
- says "SVI SPECTRAVIDEO 728 PERSONAL COMPUTER" on the left side of the top of
  the casing
- has a large green MSX logo on the top left side of the top of the casing
- has a blue 'expansion' connector
- PSG: GI AY-3-8910A
- CPU: NEC D780C-1 8337XD
- PPI: Mitsubishi M5L8255AP-5
- VDP: TMS91xx, because it's using TI TMS4416-20NL VRAMs
- mainboard version: 1.2
- SVI-728 POWER & VIDEO: version 1.2
- 4 ROM chips, 1 Mitsibishi M5L2764K (A), 1 Hitachi HN482364G-3 (B), 1 Hitachi
  unknown (C) and 1 ..82764G (D)
- RAM chips: 8x Matsushita MN4164P
Ident says:
- TMS91xx (no 4/16k effect, no address latch, clones, screen 2 mirrored mode,
  mode 3 mixed mode)
- Z80 scf: 01C529ED (dunno)
- Z80 out (c),0: 0 (MSX)
- PSG mask: AY8910

At least the latter 2 of these machines have the same BIOS (the one with the
sha1sum below. Strange is that this BIOS says it's a 60Hz interrupt frequency
system, but that is not true. It's definitely 50Hz, so the VDP is TMS9129
indeed.

-->

  <CassettePort/>

  <devices>

    <PPI id="ppi">
      <sound>
        <volume>16000</volume>
      </sound>
      <io base="0xA8" num="4"/>
      <keyboard_type>int</keyboard_type>
      <has_keypad>true</has_keypad>
      <key_ghosting_sgc_protected>true</key_ghosting_sgc_protected>
      <code_kana_locks>false</code_kana_locks>
      <graph_locks>false</graph_locks>
    </PPI>

    <VDP id="VDP">
      <version>TMS9129</version>
      <io base="0x98" num="2"/>
    </VDP>

    <PSG id="PSG">
      <type>AY8910</type>
      <sound>
        <volume>21000</volume>
      </sound>
      <io base="0xA0" num="4" type="IO"/>
      <ignorePortDirections>false</ignorePortDirections> <!-- not sure, but guess based on discrete PSG chip -->
    </PSG>

    <PrinterPort id="Printer Port">
      <io base="0x90" num="2"/>
    </PrinterPort>

    <primary slot="0">
      <ROM id="MSX BIOS with BASIC ROM">
        <rom>
          <filename>svi-728_basic-bios1.rom</filename>
          <sha1>ea6a82cf8c6e65eb30b98755c8577cde8d9186c0</sha1>
        </rom>
        <mem base="0x0000" size="0x10000"/> <!-- it's mirrored -->
      </ROM>
    </primary>

    <primary slot="1">
      <RAM id="Main RAM">
        <mem base="0x0000" size="0x10000"/>
      </RAM>
    </primary>

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

    <!-- Note: this connector is actually a non-standard expansion connector on the back -->
    <primary external="true" slot="3"/>

  </devices>

</msxconfig>
