On 07/03/2018 01:58 PM, Fred Cisin via cctech wrote: > On Tue, 3 Jul 2018, Stephen Pereira via cctech wrote: >> I believe that Mike Douglas has a utility program that you can get >> into a Northstar Horizon, and then it can receive a .DSK image sent >> from the terminal and it will write the disk for you in the Horizon. >> It’s called PCtoFlop and I think he has it in his archive here: >> http://deramp.com/downloads/north_star/ >> <http://deramp.com/downloads/north_star/> >> Good luck! > > You "get it into a NorthStar", by already booting the NorthStar to > CP/M, and using PIP. > > It looks like an excellent way to handle more images, including > N*-DOS, AFTER you have CP/M working. > NO matter what first you have to boot the horizon and if you lack prepared media its a hard stop. Mike Douglass solved it by putting an Eprom on the ZPB-A as there is a spot for a 2708 1K part. He made up a header to use more common signal voltage parts like 2716/2732 and so on. With a machine language monitor that allows loading bytes to memory the process is then easy.
Me I cheated and used a spare 64K memory board that used 2kx8 parts and put an eprom (2716) in the F000H space. Change the CPU boot address jumpers from E800/E900 to F000h and now you can talk to it via serial port. The PCput and PCget are handy and no so big to hand insert. Allison