wish I were brain normal enough to work on something for a sustained period of time and be cool and finish it me: I want to work on MAME Driver X you know how much I like reverse engineering hardware also me: hmm, I don’t own an X to compare it to and X costs $5,000 on eBay
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That also said, that mid-instruction-interruptible 68k core is going to be necessary for emulating the DTACK line. More broadly, that includes some 68k-based Macs and all of the CD-i players that used an MCU dubbed 'SLAVE' (Philips's term, not mine) for I/O.
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Apparently, the MCU will yank the /DTACK line on the SCC68070 (a 68000-based SoC) to go "Whoa, hold on a minute bro" via GPIO port B whenever a write or read to GPIO port A occurs.
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