If you think that's packing it in tight, try finding a PCB picture of Excellent System's Witch, whose ES-9104 hardware appears to be vaguely descended from the ES8611 hardware of this game. For Witch, Excellent replaced most of the fat SRAMs with skinny-DIP ones, replaced the two 8255s with one equivalent M5M82C255ASP, upgraded the PSGs to YM2203s and supplemented them with ADPCM. The resulting complexity is vaguely intimidating.
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