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Steem SSE v4.0.0 released
Posted: 01 Dec 2019 04:24
by kodak80
Re: Steem SSE v4.0.0 released
Posted: 01 Dec 2019 08:07
by troed
kodak80 wrote: 01 Dec 2019 04:24
Version 4.0.0 has finally been released.
ST model: STFM
The difference with STF is bus error (crash!) on STE register LINEWID access (Colorz, Fuzion 77 & 78, Imagination, No Cooper...).
This sounds weird. Anyone knows what this is about?
Re: Steem SSE v4.0.0 released
Posted: 01 Dec 2019 10:02
by exxos
Can only assume a register is accessed which is causing a bus error when it shouldn't, or the other way around, not very clear what it means.
Re: Steem SSE v4.0.0 released
Posted: 01 Dec 2019 12:29
by troed
exxos wrote: 01 Dec 2019 10:02
Can only assume a register is accessed which is causing a bus error when it shouldn't, or the other way around, not very clear what it means.
Yeah, but I would be _very_ surprised if that's an STF vs STFM difference. Ricoh vs IMP chipsets however I know of at least one such difference.
Re: Steem SSE v4.0.0 released
Posted: 01 Dec 2019 12:44
by exxos
troed wrote: 01 Dec 2019 12:29
Yeah, but I would be _very_ surprised if that's an STF vs STFM difference. Ricoh vs IMP chipsets however I know of at least one such difference.
Yeah doesn't make sense saying differences between STF and STFM, basically same chipset, but like you say, different manufacturers and versions of chips yes , as we know the Shifter in the ST has some differences from later ones for example. But that doesn't mean the "ST" is different than the "STF" as it depends on chips used. So I would assume the modes added to steem and not really "correct", as its the chips themselves, not the version of ST itself.
Re: Steem SSE v4.0.0 released
Posted: 01 Dec 2019 14:36
by czietz
The Hatari authors made the (also somewhat arbitrary) choice of emulating the ST with a Ricoh chipset and the MegaST with an IMP chipset. But they correctly attribute the difference in bus error behavior to the chipsets (and not the machine, like Steem):
https://git.tuxfamily.org/hatari/hatari ... Mem.c#n138
https://git.tuxfamily.org/hatari/hatari ... Mem.c#n149
Re: Steem SSE v4.0.0 released
Posted: 01 Dec 2019 22:13
by troed
Not sure I like Hatari's version any better actually. It's like having WS3 being the default wakestate, I would've preferred it to be random, as on real hardware. Faking the "most compatible" setting is a step away from accurate emulation ...
Ricoh/IMP chipset wouldn't change between boot ups on real HW though, so that wouldn't work ...