The original Turbo Pascal was a pretty simple one-pass recursive-descent compiler: https://www.pcengines.ch/tp3.htm
It looks like this one has a lot of constraints for easy 6502 code generation, like only allowing 8-bit variables in a FOR loop.
It looks like this one has a lot of constraints for easy 6502 code generation, like only allowing 8-bit variables in a FOR loop.
The problem is you really wouldn't write code for these machines the same way you write code for a bigger machine. Not least because most of them had so little memory that keeping track of an assembly program that size was not really a big deal. A lot of C64 demos were written in machine code monitors with no labels, no macros, no variable declarations, that just assembled/disassembled line by line, and saved by just saving the memory regions to disk - no separate source-code. It was a revelation to get a proper assembler...
But that meant self-modifying code (often seen used for 16 bit loops...) and effectively global variables all over the place (= data in fixed memory locations...) was extremely common as well. Trying to shoehorn that into a language like Pascal means basically writing everything in the main block and not call any functions, and even then you're unable to use most of the dirtier tricks..