>From my inspection, it seems that this machine does have the DD option. The tech manual mentions that the DD upgrade includes a small daughterboard mounted on the mainboard, and the v1.4 ROM, which I assume contains the DD driver code in the BDOS. Both a daughterboard (with a data cable to the floppy drives) and the ROM are present in the machine.
By all appearances, it's a late version. The unit was sold the day before Christmas in 1982. Based on their brisk sales at that point, the unit was probably built within a few weeks of the sale date. It also has the final two-piece molded plastic case with dark blue bezel. To answer a couple of earlier questions - yes, I have a logic probe / pulser set and a 20Mhz analog scope. First order of business is to get some known-good media, before I start thinking too much about what might be wrong with it. On Mon, Aug 17, 2015 at 2:23 PM, Mike Loewen <mloe...@cpumagic.scol.pa.us> wrote: > > The Executive shipped with CP/M Plus 3.0, in SSDD format. The Osborne > 1 required a double-density option to read DD disks. I don't recall that > the CP/M Plus 3.0 would even run on the Osborne 1, at least not on my > systems. Depending on whether the double-density option is installed on > his machine, it might require someone with a system that will write a > single-density boot disk for him. > > On Mon, 17 Aug 2015, Sean Caron wrote: > > ... >> I have a mostly working Executive ... logic is OK but the screen will roll >> when the environmental conditions are just right (probably some caps are >> getting dodgy, or a cold solder joint) ... it's usable ... I have all the >> original media and documentation; plenty of bootable floppies; I've got a >> sleeve of 5.25" blanks and I could run off a few duplicates for you ... >> not >> sure if these will work on the Osborne 1 ... if you're in the USA and you >> want to give some of the media from the Executive a shot, maybe I could >> help you out. >> >> Best, >> >> Sean >> >> >> On Mon, Aug 17, 2015 at 1:48 AM, drlegendre . <drlegen...@gmail.com> >> wrote: >> >> Thanks for the input, gents.. >>> >>> Sigh.. and here I sit, yet again, with neither a logic analyzer nor a >>> decent digital scope. Unless something comes up, looks like I'll have to >>> do >>> it the hard way, as usual - heh. >>> >>> At least the machine doesn't have a totally scrambled brain, with the >>> correct CPU - so it will be easier to work through things, as I can at >>> least partially communicate with the hardware if needed. Well, except for >>> the lack of bootable media.. >>> >>> Anyone have a spare Z-80? Or some bootable media for the Osborne 1? I >>> have >>> a few CP/M machines here, but I don't think any of them can write media >>> for >>> the Osborne. Even so, I'd need a way to get the Oz disk images to the >>> machine of choice.. and that's another huge hurdle. >>> >>> Help a brother out.. I need some bootstrap media!! ;-) >>> >> > Mike Loewen mloe...@cpumagic.scol.pa.us > Old Technology http://q7.neurotica.com/Oldtech/ >
