I am happy to help test. I have DOS 1.25 and can boot into it with my CBM II, but I'd need an 8050 image of anything else that's needed. I prefer if possible to start with an image of a working 3.3 disk so I can start at the testing the software part not the figuring out how to get it ruuning all weekend :-) Bill On Sat, Nov 4, 2017 at 9:51 AM, Mia Magnusson <mia@plea.se> wrote: > Den Sat, 04 Nov 2017 11:38:42 +0100 skrev Michał Pleban > <lists@michau.name>: > > smf wrote: > > > > > Are you planning on removing the need to boot msdos 1.25 first? > > > > Yes, that's the plan. However, I need first to figure out how to issue > > the initial "boot system" command from the 6509 to 8088, something I > > haven't tackled yet. > > I assume that involves disassembling both the 8088 ROM and the 6509 > software. Maybe someone else could step in here if it's just too much > for one person? > > (Unfortunitely I don't own any CBM-II so I can only be of theoretical > help :( ) > > > Also, first I would like to make a ROMmable version that can be placed > > in the EPROM chip on the board, but I am running out of space now (the > > ROM has only little than 3 kB free space). > > First: It is so cool that you have come so far with this project! > > Re the rom, it seems like the whole upper 64k is decoded to the rom, > and nothing else resides there, so with just an adapter and some extra > wires it should be possible to have up to 64k rom. > > Perhaps it would be a good idea to make a simple board with both ROM > and 64k RAM and some way to switch between ROM and RAM when reading > from the upper 64k. PB7 of the PC side CIA seems to be NC according to > the schematics, so that port could be used to switch between RAM and > ROM. > > This could work as a developement thing, and when things will be more > or less finalized it could be replaced by a larger ROM. With 64k ROM it > might even be a good idea to have a ROM disk for some of the most used > files, i.e. COMMAND.COM from the DOS version a user prefers to run. > > -- > (\_/) Copy the bunny to your mails to help > (O.o) him achieve world domination. > (> <) Come join the dark side. > /_|_\ We have cookies. > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing listReceived on 2017-11-04 15:00:02
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