"Fred_Scacchitti.WBST311"@XEROX.COM (05/03/88)
The Xerox 820-I does not support double density, the 820-II does. If anyone requires dd on an 820-I , I'd recommend looking into back issues of Micro Cornucopia Magazine. All things considered, the 820-II is the better way to go. The -II motherboard is a direct replacement for the -I.(if you have the Xerox supplied chassis) fas