bus/heathzenith/h89: Remove signals not present on a real h89bus #13193
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mgarlanger
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Jan 18, 2025
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Due to unique nature of the H89 bus and how some boards were implemented, additional signals and controls from the CPU board were brought to the card, usually by a ribbon cable from a chip socket. Specifically Heath's Z-89-37 and MMS's Double Density controller handled the the interrupt processing. This is modeled after the changes made for the SigmaSoft's Parallel Port card and IGC in #13040
This removes fdcirq, fdcdrq, and blockirq signals from the h89bus.