Revealing the HP-82242A IR Printer Module

[ThomasF]

(05-24-2024 11:32 AM)Massimo Gnerucci Wrote:  The VASM documents the use of user flags 8-11.

P.131

Quote:C[11]= TIMER SCRATCH REGISTER B[11]= USER FLAGS 8-11

Hi Massimo,

This is not the same flags.
These correspond to the internal flags in the NUT flag register.

The FI flags (bad name IMHO) is a serial bus, that can be driven low by any device on the bus.
This line is divided into 14 slots (0-13), and any devices can use this to signal states to the NUT CPU.
There are specific instruction (like ?FI 11) that will set the carry if the corresponding time-slot on the FI signal is driven low by the device.

Cheers,
Thomas