Re: ProDOS Error Message re "NO BUFFERS AVAILABLE"

[lyricalnanoha@dosius.ath.cx (Steve Nickolas)]

David Empson wrote:
> Assuming it is a "run forever" game with no interaction with
> BASIC.SYSTEM and no way out short of Ctrl-Apple-Reset, one option may be
> to turn it into a self-relocating SYS file. These must be loaded at
> $2000, and BASIC.SYSTEM would have the same problem loading it as the
> file is too big. It could be loaded directly by ProDOS as the initial
> .SYSTEM file, or from the QUIT code program launcher.
> 
> If you want to be able to run it from BASIC.SYSTEM as a SYS file, two
> files would be needed: a SYS file as a front-end loader, and the game
> itself in a second file.
> 
> The SYS file would relocate itself into the top of the area normally
> occupied by BASIC.SYSTEM (e.g. $BC00-$BEFF), initialize some pieces of
> the ProDOS global page (e.g. the memory map), then load the game at its
> actual run address (e.g. using an I/O buffer at $B800) and transfer
> control to it.
>

This is incredibly crude, but the PRODOS file in later editions of EHBASIC+
(e.g., http://usotsuki.hoshinet.org/eh210p8_v087ref1.zip) has a modified
Selector (http://usotsuki.hoshinet.org/selextra.lst.txt) which is capable of
running BIN files as well as SYS files.  Dunno if it'll be any use, but it
pretty much works exactly that way.

-uso.