This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
You can use a POKE 48984,192 to modify the bit map. This protects pages $00 and $01, and unprotects pages $02-$07. Note: Because the firmware and I/O cards make use of the "screen hole" bytes in the $0400-$7FF area, BLOADing over these can interfere with some devices. For this reason, it is best to have special DOS wares on a separate ProDOS diskette with a STARTUP program which does the POKE 48984,192. This way you will know that the system has been changed to run the DOS wares and not inadvertently try to run a program like Appleworks, etc.. under the modified ProDOS. ------------------------- By: David Empson A safer method is to BLOAD the file elsewhere, and copy data onto the text screen in a loop, copying 120 bytes and skipping 8 bytes, repeated 8 times. _________________________ By: Supertimer, Rubywand, David Wilson, Steve Jensen