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swtcp/swtpc09.cpp: Restore to working status, and added comments to help users. (#10062)
Retested all of these and they are still working. Did not have a UniFLEX DMAF2 disk to test that one combination, but it should be close to working. Added comments to help people make a start with these. Machines promoted to working ---------------- SWTPC swtpc S/09 Sbug Clones promoted to working ---------------- SWTPC swtpc S/09 Sbug + piaide SWTPC swtpc S/09 UNIBug + DMAF2 SWTPC swtpc S/09 UNIBug + DMAF3 SWTPC swtpc S/09 OS9
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@ -68,23 +68,89 @@
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F100 - ???? CDS disk 0 controller
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F300 - ???? CDS disk 1 controller
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The supplied flex and uniflex floppies all worked when this driver was
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created (2014-03-25), but have been broken since sometime in 2015.
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** Notes on use of MAME with common disk images **
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The message is the same for all 3 disks: Unable to identify the image format.
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MAME emulates the floppy disk controller more thoroughly than some other common
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emulators for these systems. Other common emulators can ignore the disk density
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and disk side driven by the software. FLEX numbers sectors contiguously from one
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side to the other, so a simple emulator need only map the track and sector
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numbers. Real disk images often mix single and double density formats, e.g.
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single density for the first track, and the software may not have been updated
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to correctly drive the side and density outputs, so disks for these other
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emulators might not work in MAME. These disk images and their softare need to be
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updated - this is not working around limitations of MAME, these would not be
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expected to work on real hardware either.
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Official notes:
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mess swtpc09 -flop1 DMAF2_BOOT.dsk
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press D to boot flex operating system. dir 0 will perform a directory of drive 0.
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However the disk controllers used by MAME have some options that can help with
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this transition, help get these disk images running as-is. The disk density
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selection can be overridden. The disk side selection can be overridden for a
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given number of FLEX sectors per side and this can be done separately for
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track 0 and side 0.
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mess swtpc09u -flop1 uflxbtsd.dsk
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type D to boot uniflex. This is a multiuser operating system, I need to add an extra terminal to this
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and then it would be cool to get it running multiuser.
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The FDC clock speed needs to be appropriate for the disk drives and format. The
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historical controllers typically hard wired a clock rate, and the historical
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software was not written to drive clock selection as available in some later
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controllers. The CPU clock may also need to be adjusted for some combinations,
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to meet the timing requirements.
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mess swtpc09d3 -window -flop1 UOS_3S_BOOT.dsk
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type D to boot uniflex. This one has potential to get harddisk support for uniflex in the future.
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The boot ROM many also need patching to boot a double density rather than
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single density format disk, and this emulator has an opion to patch the ROM
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for this.
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mess swtpc09i not working
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Examples:
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mame swtpc09 -fdc:0 35hd -flop1 DMAF2_BOOT.dsk
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Options:
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DMAF2/3 FDC clock: 2.0MHz
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DMAF2/3 expected density: double density
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DMAF2/3 FLEX expected sectors per side: 36
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Type D to boot FLEX operating system.
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mame swtpc09u -flop1 uflxbtsd.dsk
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Options (untested, but the DMAF2 is tested with FLEX):
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DMAF2/3 FDC clock: 2.0MHz
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DMAF2/3 expected density: double density
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Type D to boot UniFLEX.
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mame swtpc09d3 -hard1 wd0.chd -hard2 wd1.chd -fdc:0 8dsdd -flop1 UOS_3S_BOOT.mfi
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Where the disks are prepared:
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chdman createhd -o wd0.chd -i wd0.dsk -chs 306,6,17 -s 512
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chdman createhd -o wd1.chd -i wd1.dsk -chs 306,6,17 -s 512
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floptool flopconvert uniflex mfi UOS_3S_BOOT.DSK UOS_3S_BOOT.mfi
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Options:
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DMAF2/3 FDC clock: 2.0MHz
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DMAF2/3 expected density: double density
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Type D to boot UniFLEX from the floppy disk, or W to boot from the hard disk.
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mame swtpc09i -io1:dc5:fdc:0 35hd -flop1 FLEX292F.dsk
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Options:
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DC5 Control register bit 7: Erroneous side select
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DC5 FDC clock: 2.0MHz
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DC5 Expected density: double density
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DC5 FLEX expected sectors per side: 36
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CPU clock: 4MHz
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Type U to boot into FLEX
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mame swtpc09i -hard 2048X18X32.chd
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Where 2048X18X32.chd is derived from the 2048X18X32.dsk image. MAME expects the
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ROM at 0xf000 rather than 0xe800 as implement here (todo updated ROM?), so patch
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at offset 0x68 0xf1 to 0xe9, and at offset 0x2c51c 0xf1 to 0xe9. The PIA IDE is
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installed in IO6 here, yet this software expects it at IO1, so patch these to
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0xe06* at offsets 0xd6, 0xd6, 0xdb, 0xe0, 0xe5, 0xe8, 0xed, 0xf2, 0xfa, 0xff,
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0x104, 0x109, 0x10e, 0x113, 0x116. Then remove the trailing info, past
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2048X18X32X256. Then fill every second byte with zero as only the lower 8 bits
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of every 16 bit word are used. Then convert to a CHD disk file, adding the
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geometry:
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chdman createhd -o 2048X18X32.chd -i 2048X18X32.dsk -chs 2048,18,32 -s 512
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MAME appears to cold start FLEX at 0xcd00 as opposed to 0xc800, and the PIA IDE
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ROM needs patching for that, and there is a machine option to do so. At the SBUG
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prompt enter Ctrl-P and 'E800', then 'G' and it should boot into FLEX. MAME
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might not match the ROM and hardware here.
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mame swtpc09o -io1:dc5:fdc:0 qd -flop1 OS9BTBK3.DSK
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DC5 FDC clock: 1.0MHz
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CPU clock: 4MHz
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Boots into OS9, asking for the date and time.
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***************************************************************************/
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@ -627,8 +693,8 @@ ROM_END
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/* Driver */
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// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
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COMP( 1980, swtpc09, 0, 0, swtpc09, swtpc09, swtpc09_state, init_swtpc09, "SWTPC", "swtpc S/09 Sbug", MACHINE_NO_SOUND_HW | MACHINE_NOT_WORKING )
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COMP( 1980, swtpc09i, swtpc09, 0, swtpc09i, swtpc09, swtpc09_state, init_swtpc09i, "SWTPC", "swtpc S/09 Sbug + piaide", MACHINE_NO_SOUND_HW | MACHINE_NOT_WORKING )
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COMP( 1980, swtpc09u, swtpc09, 0, swtpc09u, swtpc09, swtpc09_state, init_swtpc09u, "SWTPC", "swtpc S/09 UNIBug + DMAF2", MACHINE_NO_SOUND_HW | MACHINE_NOT_WORKING )
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COMP( 1980, swtpc09d3, swtpc09, 0, swtpc09d3, swtpc09, swtpc09_state, init_swtpc09d3, "SWTPC", "swtpc S/09 UNIBug + DMAF3", MACHINE_NO_SOUND_HW | MACHINE_NOT_WORKING )
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COMP( 1980, swtpc09o, swtpc09, 0, swtpc09o, swtpc09, swtpc09_state, init_swtpc09o, "SWTPC", "swtpc S/09 OS9", MACHINE_NO_SOUND_HW | MACHINE_NOT_WORKING )
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COMP( 1980, swtpc09, 0, 0, swtpc09, swtpc09, swtpc09_state, init_swtpc09, "SWTPC", "swtpc S/09 Sbug", MACHINE_NO_SOUND_HW )
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COMP( 1980, swtpc09i, swtpc09, 0, swtpc09i, swtpc09, swtpc09_state, init_swtpc09i, "SWTPC", "swtpc S/09 Sbug + piaide", MACHINE_NO_SOUND_HW )
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COMP( 1980, swtpc09u, swtpc09, 0, swtpc09u, swtpc09, swtpc09_state, init_swtpc09u, "SWTPC", "swtpc S/09 UNIBug + DMAF2", MACHINE_NO_SOUND_HW )
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COMP( 1980, swtpc09d3, swtpc09, 0, swtpc09d3, swtpc09, swtpc09_state, init_swtpc09d3, "SWTPC", "swtpc S/09 UNIBug + DMAF3", MACHINE_NO_SOUND_HW )
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COMP( 1980, swtpc09o, swtpc09, 0, swtpc09o, swtpc09, swtpc09_state, init_swtpc09o, "SWTPC", "swtpc S/09 OS9", MACHINE_NO_SOUND_HW )
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