OSBYTE &6E (110) - Write to ROMSTROBE
On entry: X= new ROMSTROBE value On exit: X= old ROMSTROBE value
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.
OSBYTE &6E (110) - Early Watford DFS double-step control
Do not use - use *OPT40,n and *OPT80,n.
- The Micro User, August 1986, p.22.
Jgharston 21:17, 26 May 2009 (UTC)