| RC2014 Z80 /WR and /RD mutually exclusive? [message #8287] |
Thu, 04 February 2021 12:20  |
quarterturn
Messages: 86
Registered: April 2018
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On RC2014 Z80, are /WR and /RD always the opposite of each other, or can they both go low?
The reason for asking is I'm prototyping a MOS8568 video card for RC2014 and the MOS8568 has a single r + /w pin. The prototype board I'm using provides a 74LS32 to OR /WR, /RD, and /IORG into /IOWR and /IORD signals. If /WR and /RD are mutually exclusive, I could just connect /IOWR to r + /w. If not, it'll take more logic and I'm tight on extra board space.
Thanks!
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