RE: [N8VEM-S100:5600] Re: Problem with ALTAIR-IMSAI 8080 CPU Board

Harold,

That's great news! I'm glad everything is finally working. I hope you get some good mileage from this card.

I (and probably the rest of the group) would love to hear about your next projects on the S-100 bus. It's even ok if you prefer to call it the ALTAIR bus ;)

My project at the moment is getting Micro-soft 4K BASIC working on the ALTAIR. I have a working image that I've modified for use with this new 8080 card on CP/M. It doesn't use the CP/M bios calls because it will NUKE CP/M I don't know how to restrict it to stay under 55K, it proudly announces 61K free ram. Anyway, I hard coded the 8250 UART addresses into this old code, and wrote a boot loader that shifts it down from 0x0100 to 0x0000 so it can run as intended. I'll attach here, hope it comes through. Rename the .cpm to a .com file.

In my project, I'm now ready to create a paper tape copy of 4K basic.... that's my plans for the weekend.

Cheers,
Josh

Date: Sat, 15 Nov 2014 13:59:53 -0800
From: n8vem...@googlegroups.com
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:5600] Re: Problem with ALTAIR-IMSAI 8080 CPU Board

Hi Jeff and Josh,

I got Josh's new firmware v1.2 today and put it in. Now CP/M is working!!!

I am using Tera Term to transfer programs. I transferred MBASIC.COM using XMODEM to the B: drive on CP/M. It worked great!! However it has been awhile since I used the save routine. Had to make sure I had enough pages allocated. The first time I did save enough space.

Thanks guys,

Harold

On Thursday, November 13, 2014 9:50:40 PM UTC-5, Jeff G wrote:

On 11/13/2014 7:27 PM, hlrjr via N8VEM-S100 wrote:
> Hi everyone,
>
> Just a quick update. With help from Josh I found a bad IC on my board.
> Made the replacement and now the SD card is working!!!
>
> Now I need to understand how to use the SD card with CP/M. This is new
> to me. Are there any docs on how to transfer programs to the SD card?
>
> Again, thanks Josh!
>
> Harold
>
Hi Harold,
I saw Josh's reply to you in which he has a link the latest firmware
and CP/M image on the Wiki page for the board. I just wanted to share
that I was initially confused on how to use the CP/M disk image with the
SD card. I kept thinking that I had to use an imaging program like
Windisk imager to create a usable disk but I reread the documentation
and realized that all I had to do was copy the disk image file to the
formatted SD card as Disk-A.bin. When you bring up the system It will
find that image and present you with the option to boot CP/M. For all
intents & purposes it looks just like a SSSD 8" diskette that is the
original CP/M interchange format. I then followed Josh's instructions
on how to use the monitor program's XMODEM command to transfer some
additional files like MBASIC.COM and it worked as advertised.
Regards,
Jeff

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