A long time ago I had an apple ][ .
I remember the command call – 151 But I can not remember what it did ?
A:
Crikey, that's a blast from the past. I think it entered the monitor ROM (I was torn between this and Integer BASIC but I'm pretty certain it was the monitor).
You could download an Apple II emulator and find out.
paxdiablo
2008-09-27 10:38:44
A:
Yup, Call -151 entered the machine code monitor all right, but what was the difference between using PR#6 and IN#6 to boot the floppy then?
Shane MacLaughlin
2008-09-27 10:43:37
If You type PR#6 that would load the bootstrap code for Slot 6, which was the disk drive, if you were already in the assembler, then you could type C600G, which would start loading the same bootstrap code as PR#6.source the book “Beneath Apple DOS”
Charles Faiga
2008-09-27 10:51:40
I didn't think there was a difference. The PR was to send output to a card and the IN was to receive input but, for the disk, I thought they both resulted in reboot. The actual disk I/O was handled by the RWTS routines at the low level.
paxdiablo
2008-09-27 11:20:26
Does anyone know what the game was called that was space trading? It had companies like Eridani and Betelguese - it's the second game behind Star Trek that got me into computers 30-odd years ago. I think I'll go find me an Apple emulator.
paxdiablo
2008-09-27 11:22:09
I think 'Elite' is what you're after.
Jeremy Visser
2009-09-20 00:41:35
A:
Call -151 enters the monitor, 3D0G brings you back to BASIC, and typing a slot # in the monitor followed by Ctrl-P will boot that device. Amazing what one remembers after 20 years!
DiskCrasher
2010-03-29 01:55:19