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RE: [N8VEM-S100:6346] Re: IMSAI 8080A CPU board help.
Thanks Josh,
Now I know what to expect.
I did try a different CPU and reburned v2.3 Rom, still
had the same results. I even burned the v1.2 Rom and was
able to see the SD led come on for a bit. This of course
was in the blind as the Prop I/O displayed nothing.
I'll look at the memory circuits tonight if I get a chance.
Todd
----- Original Message -----
From: Crusty OMO <crus...@hotmail.com>
To: n8vem...@googlegroups.com
Sent: Wed, 18 Feb 2015 21:41:52 -0600 (CST)
Subject: RE: [N8VEM-S100:6346] Re: IMSAI 8080A CPU board help.
Hi Todd,
If you press nothing, then after 5 dots, the SD LED should light while it's initializing the SD Card to read fat files.
It will then load the default "BIOS.HEX" file and execute it at the first loaded address of the file. This will load the Monitor/BIOS file that was put into the earlier version 1.2 EPROM. On my screen picture, I then pressed a lower case 'c' to "Boot CP/M".
But you are not getting anywhere near this. The D command should INIT the SD card then dump a list of files... as shown in pic 2, it lists all the files, then you can enter any file name you want (I am entering 'bios.hex', since it's the only hex file there). The R command (pic 3) should run a ram test on the system RAM at F000-FFFF, then load BIOS.HEX (with View Load flagged). View Load only sets a flag that will display the hex file as it's loading. This will let you see the hex file as it's loading, incase there's any issues. It's not very helpful with the Console IO board, but if you use the serial port on the 8080 board, you will be able to capture the hex file and compare it with the original.
I suspect you have RAM issues... I don't know why your RAM test fails, then reports an address outside the testing range... maybe on the weekend, I'll have a chance to look at the source code.
But at least you can see what it should be doing... you should see less dust on your monitor :)
Regards,
Josh
> Date: Wed, 18 Feb 2015 19:11:21 -0600
> From: litte...@mchsi.com
> To: n8vem...@googlegroups.com
> Subject: Re: [N8VEM-S100:6342] Re: IMSAI 8080A CPU board help.
>
> As a general question to those that have built this board,
>
> What is "normal operations ?"
>
> IE:
>
> You boot it up and get the menu/prompt.
>
> Then it displays five dots and a space and starts over. (mine repeats forever)
>
> Is it polling for a input of D, R or V from keyboard or trying to load the SD card?
>
> Is this normal for others ? I have yet to see the SD LED Flash.
>
>
>
> ----- Original Message -----
> From: "Crusty OMO" <crus...@hotmail.com>
> To: n8vem...@googlegroups.com
> Sent: Wednesday, February 18, 2015 7:40:17 AM GMT -06:00 US/Canada Central
> Subject: RE: [N8VEM-S100:6340] Re: IMSAI 8080A CPU board help.
>
>
> Todd,
>
> Looks like you've found a bug in my RAM test routine. When it errors, it should report the location of the error, since it's only testing F000-FFFF, then it shouldn't report 042A. But since it is giving an error, and this doesn't happen on my board (I better recheck it tonight after work), then I would think there's something wrong with the RAM circuit. Perhaps their could be a problem with some types of RAM? Maybe even the CPU chip might be causing the trouble?
>
> Well, time to run to work....
>
> Cheers,
> Josh
>
>
>
> Date: Tue, 17 Feb 2015 19:48:45 -0800
> From: litte...@gmail.com
> To: n8vem...@googlegroups.com
> Subject: [N8VEM-S100:6340] Re: IMSAI 8080A CPU board help.
>
>
>
>
> Thanks, My Prop was similar except this
> was how I had it strapped for my setup;
>
> P77 P76
> x-x x-x
> x-x x-x
>
> I changed it to your setup and now it displays key-press
> except, it only responds to 'R' key-press.
>
> > . . r
> Testing SYSTEM RAM @F000-FFFF
> RAM PAGE MARCH .
> FAILED AT:042A - SYSTEM HALTED
>
>
>
>
> When does it try to boot to the SD card ?
> If you have time, how is your CPU board strapped ?
>
>
>
>
> On Monday, February 16, 2015 at 1:45:14 PM UTC-6, Todd Miller wrote:
>
>
> Booting up Crusty's 8080 CPU board with ver 1 of
> the Prop I/O card. The Boot loader flys off the screen
> like a key is being held down. I can see the message;
>
> Altair/Imsai <banner>
>
> <D> Directory
> <R> Ram Test
> <V> View Load
> >
>
>
> First few boots I missed it, too busy looking
> at the SMB, but then caught it out the corner
> of my eye. Rebooted and stopped the CPU after
> I saw the menu.
>
> I'm guessing I don't have the Prop I/O set up
> for the correct "status bits" for KEYBOARD
> in/out. I recall dealing with this to match
> it up to my ver Dos.
>
> What should it be set to ?
>
>
> JP8/JP9 all jumpered
> JP10 no jumpers, don't understand...
>
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