OSBYTE &6E

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.

See Also

• http://mdfs.net/Docs/Comp/BBC/Osbyte00

References

Jgharston 21:17, 26 May 2009 (UTC)