Re: CP/M 3 Boot from a Compact Flash - problems and need help.

Hi Thomas,

just noticed something a little odd,

looking at your screen shots of your CF card LBA sector 0 as reported by HxD and the same sector as read by your S100 IDE card there are some discrepancies in the values, for example

mem location HxD (LBA0) S100 IDE

00E8H 6F 68

00EAH 6F 68

0140H 2F 68

there may be more,

what CF card are you using and do you have another CF card you can use ?

regards

David Fry

On Wednesday, June 11, 2014 8:35:13 PM UTC+1, Thomas Owen wrote:

Now that I have my IDE card passing all the preliminary tests, I am trying to install CP/M on the Compact Flash drive and get the system to boot.

System:

Compupro ZPU at 2 mhz.

IDE CF Card, version 2.0a

IMSAI SIO for console

Ram 17 with Eprom installed at ‘E000’

8 gb Kingston CF

Have read, and re-read all the articles I can on the site, and decided to use the method put together by David Fry found here.

http://s100computers.com/My%20System%20Pages/IDE%20Board/Z80%20CP_M%203.0%20build.pdf

Step 1 - I modified HLDRBIOS.ASM to support my Console device (IMSAI SIO)

Step 2 - I modified CHARIO3.ASM to support my Console device

Step 3 - Assembled and built the CPMLDR.COM

Step 4 - Copied it to the CF at Sector 0

Step 5 - Assembled and built the CPM3.SYS and copied it to the CF at sector 112

Step 6 - Moved sector 48 to sector 63 on the CF

I know the install is not complete, but at this point I wanted to see what a ‘Boot’ looked like from David’s MYIDEROM:

At boot I see displayed on the console and MYIDEROM reports this drive information:

Cyl: 3C82 Heads: 010 Sectors: 0048

Then I choose ‘C’ for Boot CP/M and here is where I see a problem:

Notice the ‘LBA = 003C003C’. Why is that value so high and incorrect?

Any suggestions to getting is completed?

Thanks in advance,

Thomas