Date   : Thu, 15 Oct 1992 05:19:31 GMT
From   : usenetusenet@cs.orst.edu (Erik Petersen)
Subject: TRS-80 Model II

Well, I got a TRS-80 Model II from a friend and, surprise,
none of the boot disks worked. Soooo, I took out the boot
ROM, disassembled it, and wrote a new ROM to read the
keyboard and echo characters to the screen. It worked!

Now, I would like to run CPM programs on this thing, but
unfortunately, the ROM occupies addresses 0 to 7FFh, and
CPM expects programs to begin at 100h. Meaning, I need to
disable the boot ROM after loading the OS. Did the
original TRSDOS disable the ROM after booting?

Also, I would like to know the addresses of the control and
data ports for the two serial ports. 

Thanks for any help.

Erik Petersen

-- 
   Erik Petersen
   peterse@CS.ORST.EDU


End of INFO-CPM Digest V92 Issue #111
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