UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Gemini 80-Bus System

JohnBHanson · 16th May 2019, 4:40 pm

So close - bytes 3 and 4 in sector 0 give the load address of cp/m. The last programmed bytes in the
sector should contain c3 xx xx - this is the start address of cp/m.

After the failed boot use RP/M to look at memory and see what is there. For the moment you are better off working with the 32k image as it will not load behind rp/m.
OR
if you have linux and a 5 inch drive you can use fdparm (I think) to change the characteristics of the drive and write a disk directly.

16th May 2019, 4:40 pm	#52
JohnBHanson Heptode Join Date: Aug 2009 Location: Worthing, Sussex, UK. Posts: 661	Re: Gemini 80-Bus System So close - bytes 3 and 4 in sector 0 give the load address of cp/m. The last programmed bytes in the sector should contain c3 xx xx - this is the start address of cp/m. After the failed boot use RP/M to look at memory and see what is there. For the moment you are better off working with the 32k image as it will not load behind rp/m. OR if you have linux and a 5 inch drive you can use fdparm (I think) to change the characteristics of the drive and write a disk directly.