Martin, sent you a Digital Equipment Corp discord invite. You should br able yo get zll you questions answered there.
Sent from my iPhone > On Jan 20, 2025, at 16:04, Martin Eberhard via cctalk <[email protected]> > wrote: > > I looked at those images on Bitsavers. As far I understand, an RX211 > controller can't boot a disk with an RX11 bootstrap program. The RX211 uses > DMA to transfer the data, while the RX11 requires software to transfer the > data in a loop, one word at a time. > > Additionally, RT11 (or any other OS) has to be configured for the RX211, > differently than for the RX11, for the same reason. (A good driver would look > at the status register and detect whether it is an RX11 or RX211, and adjust > accordingly. I don't know if DEC did this or not.) > > Every single-density image that I could find either does not have a boot > loader (Track 1, sector 1) or it has a boot loader for the RX11 controller. > > I have not yet found a disk image (single-density or double-density) for an > RX211 that is bootable. This would require both the boot sector to be for the > RX211, as well as the RT11 image itself, configured for an RX211 drive. (Or > configured to detect the drive type and do the right thing...) > > I'm kind of new the the DEC world (aside from learning PDP11 assembly > language in collage...) Any pointers, advice, DISK IMAGES, etc. is greatly > appreciated :-) > > Thanks, > Martin E.
