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IIgs and call-151
- Subject: IIgs and call-151
- From: Dennis Jenkins <dennis@usb.com>
- Date: Thu, 04 Jan 2001 12:59:57 -0600
- Newsgroups: comp.sys.apple2
- Organization: Universal Savings Bank
- Xref: supernews.google.com comp.sys.apple2:4897
Hello.
On my ROM1 GS, running either ProDOS or Dos3.3, I can not seem to use
the monitor rom program correctly. I expect "F819L" to disassemble the
code that does HLIN. The code that it displays has nothing to do with
lowres graphics. Yes when my assembly and C programs 'jsr $f819', HLIN
is performed.
However, from inside the monitor, I can do a "c500g" or "c600g" to
reboot the either my 3.5" or 5.25" drives. I think (I don't exactly
remember) that I can do a "f819g" and HLIN will execute correctly
(assuming the registers happen to hold good code.
I assume the "call-151" does not put my IIgs into 6502/IIe mode, but
into 65816/IIgs mode. Is this correct? Either way, how do I get the
monitor to show me the ROM code that I except?
I have verified my assumptions with far more than just HLIN. (VLIN,
PLOT, GR, etc... all show 'wierd' code that has nothing do to with the
lowres graphics screen.).
--
dennis@usb.com Universal Savings Bank.
The three most dangerous things are a programmer with a soldering
iron, a manager who codes, and a user who gets ideas.