How do I properly allocate a memory buffer to apply double buffering in dosbox using turbo c?

Answer 1

How large do the buffers need to be?

Just declare two character arrays of the appropriate size....

after the processing routine finishes, the buffer passed can be re-used, so clear it and

populate it while the second buffer is being processed.

after processing routine finishes with the second buffer it can be re-used , so clears it

and populate it while the first buffer is being processed

the tricky part is the hand-shaking between when the processing routine finishes

and the population of the other buffer. There is no guarantee these two processes take

the same amount of time