OSE12P inputs

[bf6379]

How can I use one of the spare OSE12P inputs to qualify a scalar? I want to either disable a scalar using the input, or switch between one scalar setting and another, both having the same output function.

I understand that using the Map A/B selection input could do what I need, but that then kills all other uses for the dual map function.

[Holden202T]

i dont think you can.

[antus]

Thats correct, you can map data in ram like that. It needs to be a function thats built in for purpose. Map a/b can be used if what you need has a map a copy and a map b copy. It'll be swapping all that data though, so you cant do it for 2 items individually. Has to be all together.

[delcowizzid]

You can also use the bin switch jumper as a switch in a pinch and have 2 more lots of a/b tables in the other half of the nvram

[bf6379]

You can also use the bin switch jumper as a switch in a pinch and have 2 more lots of a/b tables in the other half of the nvram

Thanks delcowizzid. I'm not currently using an NVRAM. I have replaced the 27C256 EPROM with a 29C256 EEPROM.

[delcowizzid]

For a 27c512 or similar you can stack 2 tunes and switch 1 address pin and do the same

[bf6379]

For a 27c512 or similar you can stack 2 tunes and switch 1 address pin and do the same

I might try that. Toggling the A15 pin should switch between the upper 256k and the lower 256k. Am I on the right track?

Thanks,

Brett.

[delcowizzid]

Remove a15 pin from the memcal and run a 4k7 or 10k resistor to a15 from vcc and switch pin a15 to ground to swap between each half is the best