The value passed in X is written to the ROMSTROBE port and the RAM copy, the old value of the RAM copy is returned. Implemented in the Electron Plus 1 Support ROM. The ROMSTROBE port is at &FC73 on the Electron, and writes the byte of data while the ROMSTROBE line is activated on the cartridge slot.
Do not use - use *OPT40,n and *OPT80,n.
This page was last modified on 15 February 2016, at 00:37.