28983Re: Anyone have a copy of CPM for a Jade Double-D disk controller
- Jan 19, 2013--- In firstname.lastname@example.org, Dave wrote:
>I recently got CP/M running on the IMSAI.
> On 19/01/2013 13:37, evan@... wrote:
> >>> Jade needs a special copy of CPM since it has a z80 processor onboard to handle the IO.
You can just cut and paste CP/M, that's what I did.
2 things to consider.
1. Where in RAM this copy of CP/M is to reside (How much RAM is available?)
2. The BIOS. The BIOS jump table has to be where CP/M expects it to be (as per #1), the routines in BIOS just match your hardware.
The routines just do the basic things:
-send/receive characters to the console,
-Select a drive, a track, a sector.
-Translate a sector number with it's skewed (interleaved) sector
-Designate a memory buffer to transfer data with the disk
-Read/Write the selected sector with data
Rich Cini has a very detailed write up on this and helped me a great deal. Check his website, look in the IMSAI section.
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