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vossstef / tang_nano_9k_6502

6502 SBC in a Gowin GW1NR-9 FPGA on a Sipeed Tang Nano 9k
GNU General Public License v3.0
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Flashing cursor only, no response from keyboard #6

Closed djfergus closed 1 year ago

djfergus commented 1 year ago

Hello. This project seemed to build ok but when I run it I just get a flashing green cursor and nothing else.

Keyboard, monitor and Tang Nano 9k all work perfectly with your VIC-20 project so doesn't seem like hw issue.

Not sure if the basic ROM is loading? Not sure where I should start with troubleshooting.

vossstef commented 1 year ago

Hi, pls. do a fresh clone of the repo and program with the Gowin programmer the ready made .fs bitstream (no synthesize) Green blinking cursor will apear. Cold[C] or warm [W] start ? Answer with a 'c' keypress MEMORY SIZE? Answer by typing 4096 TERMINAL WIDTH? Answer by typing 80

System shall response with BASIC xy and OK promt.

If that all works well then you might want to start your own synthesize. It might be that there is a need for two 10K pull up resistors to Tang 5V needed for your keyboard (directly at Keyboard connector side clock and data) if you face problems in PS/2.

djfergus commented 1 year ago

ok thanks. It works if I program the .fs file directly from github but fails if I synthesize/pnr myself from source. I'll close this issue and take a look another look at my environment. Curious your other projects build ok except this one. Cheers.