Name: kjt_write_sysram_flat

Action: Writes to system memory in a flat, linear addressing mode

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

Output Registers : None (but see below)

Trashes: B,C,E,H

Notes:

The routine saves and restores the current bank setting around the write 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.