What I/O boards do users want?

Author	Message
donmck Guru Joined: 09/06/2011 Location: Australia Posts: 1314	Posted: 03:43am 11 Jun 2011         Gizmo said   It is possible to make a slow PWM output in software, say at 100Hz, with the existing firmware. Glenn I would think so Glenn. The speed capabilities of MM-Basic would be the only restriction, and I am not familiar with what can be done just yet. In the TRS-80 days, when Basic got too slow, we called in line assembly language routines in the middle of Basic lines of code. You had to "POKE" the machine code into memory initially with Basic, but it did work. I don't know if Geoff has provided for, or looked at ML calls to date. I always remember Basic bogging down at times, it would tie itself in a loop. To do a quick test for this, we would put an off tuned radio (noise only) near the motherboard, and you could tell when Basic bogged down into crazy loops while it cleaned up arrays and memory behind itself. This is when you needed to leave Basic, and get a driver going with Assembly code. But then we had an 8 bit Z80A micro running at 1.79Mhz with 4 to 12K Rom, and 4 to 16K ram. Cheers Don... https://www.dontronics.com