BSave and BLoad for the Commodore 64

Originally published on: Thu, 06 Aug 2009 01:15:42 +0000

I wrote this little subroutine package for the Commodore 64 in 2002. You can likely still find a cached Usenet post to comp.sys.cbm referring to it.

I thought that I would add in an open-source license header and would present it here.

The source code below is for two machine language library routines which can be called from BASIC. The first routine will save a section of the C64's memory to disk. The second will load a file from disk into a specific spot in memory. These functions are akin to Applesoft BASIC's BSAVE and BLOAD binary I/O commands.

I did not wedge the CHRGET routine to add any new command verbs to BASIC; one must use the SYS command to invoke each subroutine. A jump-table at the beginning of the module controls which of the two functions you'll execute. Address 49152 is the BSAVE routine. Address 49152+3 is the BLOAD routine.

Please note that the filename parameter must always be in a variable. I didn't have the routine that would parse a literal properly readily available ... and still don't remember how to do it off the top of my head. ;-)

Unless otherwise noted, all code and text entries are Copyright ©2009 by James K. Lawless

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