Home Page Forums MAME MAME NLQ401 printer

That's a real shame. So much cool stuff blocked and not only just printers. Eventually the users will rebel against the fatcats at the top of the pyramid and they'll be a good ol' hangin' lol

I should upload that stuff to a github branch anyway before something happens to my hard drive.


Here's a PR to fix the address calculations for RelP and RelM on the LH5801 used in the PC1500:

https://github.com/mamedev/mame/pull/12999


Going to see if I can make the plotter work on the PC1500...

For some reason it gets into a startup cycle where it keeps running the printer startup code over and over.

Using the debugger to skip past that gives the first time it does something.

Running the startup over and over could be another opcode bug or it could be legit failing a power-on self test.

One possible reason is that the CE-150 rom gets bank switched out by the PV flipflop, which isn't handled by either the driver or currently exposed by the lh5801 cpu.

Poking values into 79F4 changes the size of the text.

(can't read my, can't read my poke &79F4 face)



(man, the imgur website seems to be acting really wacky for me lately)


edit: turns out there's good Basic support for the CE-150 with commands to set character size (CSIZE) to do line feeds (LF) and to switch from text to graphics (TEXT and GRAPH) as well as drawing lines (LINE), moving the pen (LCURSOR for text, GLCURSOR for graphics).

Yeah, if there's unemulated bankswitching it's almost certainly failing the POST then.

implemented pv and it boots instead of looping!


although I'm sure this isn't the way to do it...


map(0xa000, 0xbfff).r(FUNC(pc1500_state::ce150_r)); // ce150 printer rom

u8 pc1500_state::ce150_r(offs_t offset)
{
const u8 *ce150 = memregion("ce150")->base();
if (!m_maincpu->pv()) return ce150[offset];
else return 0xff;
}

The more correct way would be to add an output callback for the PV pin and have the driver hook it and flip the active memory view.

ok, I set up a memory view, but what's the best way to get it to read FF when you have no rom there?

should I just leave the view m_view[1] empty?


u8 pc1500_state::empty_r(offs_t offset)
{
return 0xff;
}


map.unmap_value_high();
map(0xa000, 0xbfff).view(m_view);
m_view[0](0xa000, 0xbfff).rom().region("ce150", 0);
m_view[1](0xa000, 0xbfff).r(FUNC(pc1500_state::empty_r));


edit:

would it be okay to use:

m_view[1](0xa000, 0xbfff).unmapr();

You really like making things more complicated than they need to be, don’t you? Take a step back and think.