Name: kjt_read_sysram_flat

Action: Reads system memory in a flat, linear addressing mode

Input Registers : E:HL = $00000 - $7FFFF (address to read)

Output Registers : A (byte read from address)

Trashes: B,C,E,H

Notes:

The routine saves and restores the current bank setting around the read so make sure any interrupt service routine is in unpaged memory (<$8000) or disable interrupts to avoid problems.

As this routine is not fast, only use if convenience is more important than speed.