Steem SSE manual wrote:-C1: 6850/6301/MIDI/E-Clock
Using code by Arne Riiber and doc by Stephane Catala - Belzebub / ST
Connexion, Steem features low-level emulation of the HD6301 "intelligent
keyboard" (IKBD) chip since v3.4.
The main goal was to be able to run some (very rare!) demos reprogramming
that chip without copying Hatari code, but it does more than that, being
better than fake emu in some cases. When you change this option, you
normally should reset the ST, but Steem won't force you.
In case you're curious, the demos that reprogram the chip are:
Dragonnels, Froggies over the Fence, Transbeauce 2.
All are available here:
The option also commands ACIA (the MC6850 chip) and MIDI (the musical
interface) improvements, because timings corrections concerning those 3
chips have an "all or nothing" character.
Both the IKBD and the MIDI connector use a 6850 to communicate with
the CPU. Communication between the 68000 and the 6850 uses the E-Clock
of the microprocessor. This needs to be emulated too. In turn, the E-Clock
also affects the timing of VBL and HBL interrupts. So you see, changing this
option has many consequences.
Why an option then? Emulation is more processor-intensive, you may prefer the
PC mouse feel to the ST's, and all those modifications could very well break
If the option isn't checked, Steem falls back on the same emulation as
Steem 3.2 for all those chips.
Steven Seagal wrote:IIRC warm reset is enough, and it could even work without any reset in some cases.
If you hadn't copied the IKBD rom, the option should be greyed out.
Do you run at 8mhz? When overclocking the ST, option C1 isn't very good.
Could you give us more config info (TOS, HD, monochrome, etc.)?
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