John wrote: > EXTREMELY RARE QL PM EPROM Chip (8000h) - this is out of a very early > KLUDGE - unfortunately, the other two EPROMs and/or the code stored on > them have not been found. This is the PM version of QDOS - the earliest > release version of QDOS we know of which escaped the doors of Sinclair > Research was the later FB EPROM, which contained at least one oddity - the > AT command was AT column,line (instead of AT line,column) which forced > Psion to write a boot file for their programs which would swap between the > two variants depending on your ROM version! It shows how rare the FB ROM > was that no-one else had to bother!
>From my records PM (QDOS v1.00) came after FB (QDOS v1.01). <snip> v1.00 'FB' : Came out in April 1984. This version of the firmware had lots of errors. v1.01 'PM' : Faster than FB, more tolerant of the Microdrives, but it still had lots of errors. Both FB and PM firmware were packed with bugs and needed a 'kludge board' to carry extra chips outside the computer. <snip> Urs _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
