RE: [N8VEM-S100:4805] 8080 board, Firmware and break

Hi Don,

Sure. I wrote it into the Rev 2 Manual. I also updated your Bill-of-materials with the right values for RP2, but I missed adding it as an ECO there.

Cheers,
Josh

Date: Sat, 2 Aug 2014 10:48:48 -0700
From: ilv...@gmail.com
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:4805] 8080 board, Firmware and break

Josh,

What is the Wiki link for the 8080 board? This is teh one I've been updating right?

I didn't see ECO change number 3 on the Wiki build page. Want me to add it?

http://n8vem-sbc.pbworks.com/w/page/82798540/Build%20Notes%20and%20Bill-of-materials%20-%20REV%202

On 08/ 2/14 08:57 AM, Crusty OMO wrote:

Hi Guys,

I have been able to get CP/M 2.2 booting from the SD-Memory card. Please find the JAIR-Firmware V1.zip file on the wiki page.
http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder&param=S-100%20ALTAIR-IMSAI%208080%20CPU%20Board

It will boot CP/M 2.2 and give the "a>" prompt. (I thought it would be a capital A, but it's not.)

It does not change to Drive B (haven't tested C or D with any serious investigations).
When trying to change to drive B, CP/M attempts to access Track 0xFF Sector 0, which are not valid. Track should be between 0 and 76 (77 tracks in all) and Sector# should be between 1 and 26. I'm not sure how or where it's coded in the drive parameter table. Perhaps these are the previous values that just haven't been initialized properly? I will need to go deep into CP/M territory to resolve this issue, but don't want to keep you waiting for some sort of firmware.

Further, I have updated the schematic with the latest changes and updated the Manual with all the ECO changes (see wiki page).
There are 3 ECO's required:
-Jumper for the SD card
-Jumper for the disconnected IC-H7 (8T97) pin 15
-Change RP2 from 4.7K to 47K (to solve issues with 16550 UART and 82C50 UART).

I must now unplug this project for 5 weeks. I am exhibiting a COSMAC ELF collection at VCF-MW in Chicago and have only 5 weeks to finish my preparations for this.

Mr. Jack Rubin, I have your board packed with my RCA STUDIO II, see you at the show!

Mr. Matthew Turner, Thank you again for the loan of your Super ELF. I will get to work on it in a priority sequence (it's about #7 on my list).

Regards,
Josh Bensadon

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Don Caprio
ilv...@gmail.com

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