Todd, It doesn't have to be blind, the firmware was designed to first talk to the UART on the 8080 board. I would even suggest trying to run the board stand alone with the front panel. Connect a terminal at 9600 baud to the serial port.
Regards, Josh > Date: Thu, 19 Feb 2015 12:39:23 -0600 > From: [email protected] > To: [email protected] > Subject: RE: [N8VEM-S100:6350] 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 <[email protected]> > To: [email protected] > 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: [email protected] > > To: [email protected] > > 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" <[email protected]> > > To: [email protected] > > 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: [email protected] > > To: [email protected] > > 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... > > > > -- > > You received this message because you are subscribed to the Google Groups > > "N8VEM-S100" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected] . > > For more options, visit https://groups.google.com/d/optout . > > > > > > -- > > You received this message because you are subscribed to the Google Groups > > "N8VEM-S100" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected] . > > For more options, visit https://groups.google.com/d/optout . > > > > -- > > You received this message because you are subscribed to the Google Groups > > "N8VEM-S100" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. 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