Code before Ben Eater version?

Would you happen to have the code before you implemented the serial with VIA? I'd like to implement a version using the UART, but there seems to be a lot of things changed in many places in the code, specifically using the serial_in_byte_received related function. It's hard to dig out what's trying to be done in each instance. I'd like to roll it back and then

Robb

The original code can be found here: http://www.gammon.com.au/GPascal/source/

If you look at the code here:

https://github.com/nickgammon/G-Pascal/blob/3292b3938a9c83d360fb26d42783fa3207455a16/src/hardware.inc#L212

You can see the minor changes that are made for the emulator, which I used for a lot of testing.

You basically need to replace:

• CHRIN - gets a character from serial (blocks)
• write_char - writes a character to serial
• GETIN - same as CHRIN
• serial_available - (non-blocking) see if a character is available from serial

That's it!

In the emulator CHRIN was slightly different to GETIN. CHRIN read an entire line (it made typing a line of text easier) whereas GETIN read a single character.


Look for the ".if EMULATOR" directive.