mos_8502 :verified: on Nostr: So this is embarrassing. I learned this with my oscilloscope. When I put together the ...
So this is embarrassing. I learned this with my oscilloscope.
When I put together the header for the Blinky test, I made little address aliases for all the important I/O addresses how you do. One of them is the Port 7 Chip Select control register, or “PCS7”. It is located at 0x00DF27.
My header file said it was at 0x00DF72.
A two character transposition in a header prevented the IO select line for the VERA from ever being even possible to activate.
I am the world’s biggest idiot for the evening. You may now laugh at my expense.
That being said, I did fix it just now, and now the VERA comes to life at boot. In the attached photo I just took, you see a CRT monitor wired to the prototype. It’s not a black screen anymore.
It’s not exactly what’s supposed to be displayed, but all I said I needed today was to display something other than a black screen. So I win.
#Sentinel65X
Published at
2024-06-10 03:43:27Event JSON
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