The RX8 Maintenance Manual shows the "Standard" Device Code for the RX8E controller as 70. I looked through the OS/8 RX01 handler source and it shows the Device Code as 75. The OS/8 RX01 bootstrap uses Device Code 75. David Gesswein's RX01 dumprx01 and restrx01 programs use Device Code 75. So, I guess that the RX8 Maintenance Manual is wrong and I should set the Device Code to 75? -- Michael Thompson