Van: cctalk-bounces at classiccmp.org namens Brad Parker Verzonden: ma 12-06-2006 20:38 Aan: General Discussion: On-Topic and Off-Topic Posts Onderwerp: unibus RX11 vs RX211 Hi, Finally getting around to some spring pdp-11 hacking. I managed to boot 2.11BSD on my 11/44 this morning :-) Now I want to (slowly) add peripherals. I discovered I have an RX11 board (quad width) and I think I want to try and connect it to an RX02 drive box. Anyone know the basic difference between an RX11 and an RX211? Can you plug an RX02 into an RX01? I really only want RX01 to be honest. Something tells me I need an RX211 but i thought i'd be lazy and ask here. M7846 RX11 U RX01 floppy disk controller M8256 RX211 U RX02 floppy disk controller -brad ================================ Ok, throwing in my 2 ct. The RX11 can only do programmed I/O, whereas the RX211 does "DMA". The RX01 disk drive is only single density, and the RX02 is a "funky" double density (the preamble, etc. is still single density, but the data field is double density). However, the control board inside the RX02 (the top one) has a small DIP switch (2 switches) that can put the RX02 drive into "RX01-mode". I never tried it, you can see it on my RX01/RX02 page at www.pdp-11.nl/peripherals/disk/rx-info.html <http://www.pdp-11.nl/peripherals/disk/rx-info.html> as I said, just my 2 ct, - Henk. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.