4 Commits

Author	SHA1	Message	Date
Virgil Dupras	e0bcf3473e	Adjust Grid subsystem ... Rename ROWS to LINES (it's what VE uses). Also, don't use COLS and LINES as immediates in the Grid subsystem: we expect those words to be available at runtime.	2020-11-10 19:06:39 -05:00
Virgil Dupras	b97e761942	Add Grid subsystem ... The goal is to offload the SMS VDP driver a little bit.	2020-11-09 17:26:15 -05:00
Virgil Dupras	2b8524d11e	sms: CPORT_CTL is write-only! ... why did I think that I could read from it?	2020-11-08 08:43:24 -05:00
Virgil Dupras	7d568bd782	sms: simplify and solidify ports-related drivers ... Add _TRA!, _THA!, _TRB!, _THB! routines to easily handle those pins' value without stepping on other pins like the drivers previously did. For SDC driver, it's going to be important soon because it turns out that I can't get away with "always on" CS, so I'll need a scheme where it's important that TH/TR pins have stable values.	2020-11-02 18:53:57 -05:00