Hi Chuck To my knowledge, you are correct that the only listing created for implementing a CBIOS was for the MDS 800. It used ROM BIOS calls as I recall. I think this was because Kildall did most of his work on the Intel boxes as that is where he had PLM. At least that is what I recall. This is also true, most. For the information I got, one reference on the web is: http://www.retrotechnology.com/dri/d_dri_history.html#post under the section: Early CP/M, PL/M and DRI history I question that he stayed with an upgraded Intelec-8. At least the listings that I've see would have had to have been a MDS-800 at least. This is not a simple upgrade. The 800 is a multibus and the -8 isn't. I don't think the I/O calls had been standardized before the 800. Also, the listing specifically state MDS-800. There were 8080 boards for the -8. I know this because I have one in my piles someplace ( the board, not the -8 ). Other references specifically state that he and Torode worked together on releasing the first version for the S-100. It also states that this was the more universal version that had the separate CBIOS, intended for easier implementation on other systems/controllers. Dwight _________________________________________________________________ You keep typing, we keep giving. Download Messenger and join the i?m Initiative now. http://im.live.com/messenger/im/home/?source=TAGLM

Hi I found an email for John Torode and asked him about his controller. He said that he believes that his controller was the first to be sold that had CP/M implemented for the S-100. He said that this was 1.3. He also stated that the FDC-1 controller was the same basic controller that he used on the Intelec-8/80 that ran the very first CP/M. He stated that the controller was based on work that he did for his thesis. dwight _________________________________________________________________ You keep typing, we keep giving. Download Messenger and join the i?m Initiative now. http://im.live.com/messenger/im/home/?source=TAGLM