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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>atarulum</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/blueMSX/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Fri Nov 02, 2007 6:16 pm<span class="gen"> </span> Post subject: A little information about FS-A1FM to emulate on blueMSX</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">It is not so easy to emulate Panasonic's FS-A1FM (FDD with <br />1200bps Modem <br />integrated MSX2 machine) <br />FS-A1FM includes Panasonic/ASCII 08KB memory Mapper in <br />Slot 3-3. <br />But in spite of emulation of Panasonic 08KB mapper, it <br />doesn't work <br />correctly. <br />Because of modem's emulation with I/O register. <br />I attach Slot 3-1 / Slot 3-3 for FS-A1FM. <br />Slot 3-3 is fixed. <br />But the register on Slot 3-1 is variable. <br /> <br />Here is a little information for FS-A1FM <br /> <br />[FS-A1FM] <br />FSA1FM.ROM (firmware.rom -- 1MB) shows 16 pages repeated twice (0-F == 10-1F) <br />but surprisingly, <br />their content is a mirror of the modem utility that runs <br />at slot 3-1! In <br />that slot, there are 16KBytes of Extended ROM at <br />0000-3FFF, the modem <br />utility at 4000-5FFF using its own mapper, and ram at <br />6000-7FFF, along <br />with some I/O ports at 7FC0-7FCF (that's why the files <br />SLOT31-?.ROM are <br />each different). Switch address is 7FC4, but bits 4-7 are <br />always <br />preserved when paging, so they may have another function <br />related to <br />modem. <br />So which pages of slot 3-3's mapper are actually used in <br />that slot? At <br />least A8-AF are used, so you'll have to make a longer <br />dump. By the way, <br />this slot has ports similar to FS-4600's slot 3-1, though <br />the mapper is <br />Ascii 8KB. But I can't assert their exact functionality <br />until I analyze <br />the full rom. <br /> <br />FS-A1FM's slot 3-3 Pages 80-FF are all the same as 00-7F <br />except for this: <br />80-83, 88-8B: disconnected (all bytes FF). <br />84-87, 8C-8F: eight mirrors of one only 8KB ram area. <br />So 00-7F is enough for future emulation. <br /> <br />This is additional data about mapper structure of FS-A1FM: <br /> <br />[Slot 3-1] <br />0000-3FFF: extended bios. <br />4000-5FFF: secondary mapper on pages 00-0F of Slot 3-3's <br />rom. Switch <br />address is 7FC4 (bits 0-3). <br />6000-7FFF: secondary mapper on pages 80-8F of Slot 3-3's <br />rom. Switch <br />address is 7FC4 (bits 4-7). <br />Initial value for 7FC4 is undefined. Because of this, all <br />pages 00-0F <br />have the same boot code. <br />7FC0-7FCF: I/O ports. <br />8000-FFFE: disconnected. <br /> <br />[Slot 3-3] <br />Basically an Ascii 8KB megarom. Differences are: <br />0000-1FFF: extra 8KB bank. Switch address is probably <br />6400, readable at <br />7FF0. <br />2000-3FFF: extra 8KB bank. Switch address is probably <br />6C00, readable at <br />7FF1. <br />Standard switch addresses 6000/6800/7000/7800 are readable <br />at <br />7FF2/7FF3/7FF4/7FF5. <br />7FF6,7FF7: always read 0. <br />7FF9: bit 2 (value = 4) activates ports 7FF0-7FF7. <br />In fact, extra banks are never used. Initial value for all <br />six banks is <br />A8 ( = page 2<img src="images/smiles/icon_cool.gif" alt="Cool" border="0" />. <br /> <br /> <br />I think it is different from Panasonic 08KB Mapper for FS-A1WX/WSX/ST/GT. <br /> <br />Here is SLOT31-SLOT33 ROM <br /> <br /><a href="http://nlmsx.generation-msx.nl/forum/file.php?2,file=284" target="_blank">http://nlmsx.generation-msx.nl/forum/file.php?2,file=284</a> <br /> <br /> <br />P.S. FSM.COM is made by Kichi (Japanese MSX User) to dump <br />from Modem Mapper Cartridge just like FS-CM1 / FS-A1FM. <br /> <br /><a href="http://www.msxarchive.nl/pub/msx/emulator/system_roms/Dumping_Tools/FSM.COM" target="_blank">http://www.msxarchive.nl/pub/msx/emulator/system_roms/Dumping_Tools/FSM.COM</a> <br /> <br />This tool may be useful to realize Panasonic Modem Mapper emulation.</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/blueMSX/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
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