Version Register
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Version Register
The version register in IO Chip give informations like :
Bit(7) : Mode => Pin /LANG from IO Chip (can be set by jumper)
Bit(6) : VMode => Pin /PAL from IO Chip (can be set by jumper)
Bit(5) : Disk => Pin /DISK from IO Chip
Bit(4) : Reserved
Bit(3-0) : Version => ???
Is there any signal from IOChip corresponding to Bit(3-0) or value are stored inside the chip?
Bit(7) : Mode => Pin /LANG from IO Chip (can be set by jumper)
Bit(6) : VMode => Pin /PAL from IO Chip (can be set by jumper)
Bit(5) : Disk => Pin /DISK from IO Chip
Bit(4) : Reserved
Bit(3-0) : Version => ???
Is there any signal from IOChip corresponding to Bit(3-0) or value are stored inside the chip?
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Re: Version Register
Verison part is hardwired to 0001 on all hardware I have seen (that has TMSS)
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Re: Version Register
Yeah, it's zero on a 315-5309 IO chip and 1 on the 315-5402 (integrated IO chip and arbiter on a VA5) and all later IO chip versions. The 315-5402 doesn't have a full TMSS implementation though. Attempting to bank in the TMSS ROM will lock the machine (assuming because !DTACK is not being asserted for that address)
Re: Version Register
Ok thanks for this informations
The value is hardwired inside the chip or come from external (by a jumper for example)?
The value is hardwired inside the chip or come from external (by a jumper for example)?
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Re: Version Register
Right, 315-5402 is special, it shows no TMSS when in JP mode, while TMSS is shown in EN mode. I did notice the freezing problem with TMSS as I tried to dump the ROM when accessing the banking register...
The value is not adjustable externally.
The value is not adjustable externally.
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Re: Version Register
Interesting. Were systems with the 315-5402 were actually released outside of Japan, or is this just from testing Japanese units with a region mod?TmEE co.(TM) wrote: ↑Tue Feb 16, 2021 11:48 amRight, 315-5402 is special, it shows no TMSS when in JP mode, while TMSS is shown in EN mode. I did notice the freezing problem with TMSS as I tried to dump the ROM when accessing the banking register...
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Re: Version Register
I have only ever seen the chip in Japanese machines, never in EU or US ones. I have the chip transplanted onto an EU VA5/6 board and the region mod changes TMSS behaviour. l_oliveira has some observations done too in past, telling that "SEGA" write is unnecessary when the language setting is in JP instead of EN (50/60 has no effect).
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