I'll add some info from your nicely documented code. * A13 value is tested at 0xF1FE, and controls a branch to 0xF1EB; seems to change the way serial data is transmitted. hardware default is to branch. * A12 value is tested at 0xF071, not sure what it does yet. hardware default is to branch. * A11 value is tested at 0xFF48, seems to change hardware interrupt handling. hardware default is to branch.
On Sun, Jan 28, 2024 at 8:31 AM Stephen Adolph <twospru...@gmail.com> wrote: > Darren, another question, > There are some inputs on pins 30,31,32 (called A13, A12, A11) that > correspond to P45, P44, P43 on the HD6301. > > Port 4 of the HD6301 is hooked up to pins 73.36,35,32,32,30,29,28 for > P40-P47. > > I'll go look at the code, but these 3 inputs are configurable. I wonder > what they do? > > Steve > > > > > > On Sun, Jan 28, 2024 at 8:21 AM Stephen Adolph <twospru...@gmail.com> > wrote: > >> Thanks Darren. >> >> Now that we have the real tpdd firmware I wonder what we can do with it. >> Some of those variables look tempting, like side and # of tracks. >> >> Another question.. it looks like was there a second unpopulated serial >> port on the drive? Anything in the code on that? >> P7 is unpopulated and not in the schematic, but it is there. >> >> Steve >> >> >> >> >> >>
