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I don't seem to be able to access port registers using PEEK/POKE. I wrote a test program to read all registers in the range 0xff80 to 0xffff, which includes PC8 (0xffeb) and PD8 (0xffdb). Port 8, pin 7 of the H8/3664 is P15 on the Atom Pro X. I can switch on and off an LED connected to P15 by hitting the "1" and "2" keys on my keyboard, but the displayed contents of PD8, as well as every other register in the range 0xff80 to 0xffff, is always 0xff.

Reg var Byte
DReg var Word

Main:
Serout S_OUT, I9600, ["Go:"]
For DReg = 0xff80 to 0xffff
Peek Dreg, Reg
Serout S_OUT, I9600, [hex Reg]
Serout S_OUT, I9600, [","]
Next
Serout S_OUT, I9600, [13]
Serin S_IN, I9600, [Reg]
If Reg = "1" Then Gosub Lite
If Reg = "2" Then Gosub Dark
Goto Main

Lite:
LOW 15
Return

Dark:
HIGH 15
Return

I haven't received a response from support or this forum about how to get direct access to I/O registers, so I explored another approach: assembler code. But the ASM { ... } syntax does not seem to work in the PRO version of the IDE.

Yes, I believe the 'ASM' construct only works on MBasic Pro, which is their compiler. They may get it working on the Atom Pro module, although the Atom module does not support it.

You can directly access port/pin/direction registers using the DIR/IN and OUT variables(7.1.0.2+). The PEEK/POKE commands only access memory locations F780 through FFFF and(heres the key) PEEK and POKE are indexed at 0. So PEEK 0,variable would grab the value at F780 and store it in variable.

Nathan

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