<?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>