On 9/3/2015 11:50 PM, Chuck Guzis wrote: > On 09/03/2015 08:49 PM, dwight wrote: >> A pal could have worked as well. Dwight > > A GAL should also be useful--and maybe a bit more flexible. To emulate > the OC outputs, one can simply manipulate the output enable so that a > '1' output is High-Z and '0' is, well, '0'. I believe individual oput > tristate control is allowed in non-registered mode for GALs. A PALCE > should also work. > > A 20 pin PLCC should fit on a DIP-sized PCB. > > --Chuck
Yup - see my other post on this topic, though I used a through-hole GAL rather than a PLCC (the PLCC is really a good idea). The issue with OC, though, might be what it was used for. If it was just used for wired OR / wired AND then, yeah, your idea should work OK. JRJ
