Hi Todd,
Do you have all the ROM jumpers installed?
Hmm, that might just cause the problem! The firmware is looking to use some RAM, but while in Shadow ROM mode, the top block is ROM...
Set your jumpers like this....
You may also note that I don't use or install chips A2, B2 and C3. These chips provide full modem support, which I don't really need.
Regards,
Josh
Do you have all the ROM jumpers installed?
Hmm, that might just cause the problem! The firmware is looking to use some RAM, but while in Shadow ROM mode, the top block is ROM...
Set your jumpers like this....
You may also note that I don't use or install chips A2, B2 and C3. These chips provide full modem support, which I don't really need.
Regards,
Josh
> Date: Mon, 23 Feb 2015 19:14:23 -0600
> From: litte...@mchsi.com
> To: n8vem...@googlegroups.com
> Subject: Re: [N8VEM-S100:6427] Re: IMSAI 8080A CPU board help.
>
> Josh,
>
> I've studied the scheme's, ohm'd out traces, pulled chips, looked under a
> magnifier till my eyes bled and even scanned the solder side on my flat bed
> scanner to view under magnification. No solder bridges found.......
>
> It should not work, but I'm happy it does. I need a second set of eyes.
> If someone would take a look, perhaps I missed something, maybe it's not
> jumped correctly;
>
> https://sites.google.com/site/litterbox99/_/rsrc/1424722167817/home/img055.jpg?height=167&width=320
>
> The scenario is, no prop I/O just com port;
>
> Version 1.2 will boot Rom & load/run Monitor & CP/M with SD Card with J5 2-3, nothing if J5 1-2.
> Works ! Yeah !!!!!
>
> Version 2.3 will boot from Rom and display banner/menu. SD card not found. J5 position doesn't matter.
>
> Keyboard only responds to "R" nothing else. If there is no keyboard input it will do
> five dots + space + five dots... <infinite repeat> Looks like want's to boot the SD
> card, but it wont.
>
> I'd like to resolve this with v 2.3 so I can use the prop I/O and no com port.
>
>
> Todd
>
>
> ----- Original Message -----
> From: "Crusty OMO" <cru...@hotmail.com>
> To: n8vem...@googlegroups.com
> Sent: Monday, February 23, 2015 8:03:33 AM GMT -06:00 US/Canada Central
> Subject: RE: [N8VEM-S100:6417] Re: IMSAI 8080A CPU board help.
>
>
> Todd,
>
> The Shadow ROM Kill Jumper JP5 moves from 1-2 when using v1.2 firmware to 2-3 when using v2.3 firmware.
> Ignoring the funny similarities in the jumper/version numbers... keeping the jumper in 2-3 when using v1.2 should not allow you to run CP/M. Wait! it shouldn't allow you to run the monitor either... in that version, the boot loader copies the ROM contents to upper RAM, then it writes a jump instruction into lower (Write Only) RAM, that instruction is written just after the OUT instruction that will kill the ROM... Bottom line, if v1.2 works with jumper in 2-3, then there's some kind of short in those circuits. Pull out that jumper and try following each trace and ohm it out with adjacent traces. I haven't heard of anyone having problems with micro shorts from PCBCART, I'm using 12mil spacing, which is a lot. It might be a solder short ? Happy Hunting!
>
> Regards,
> Josh
>
>
>
> > Date: Sun, 22 Feb 2015 21:28:32 -0600
> > From: litte...@mchsi.com
> > To: n8vem...@googlegroups.com
> > Subject: Re: [N8VEM-S100:6415] Re: IMSAI 8080A CPU board help.
> >
> > No, I did not move the kill jumper. Stayed at 2-3 all the time.
> > All components used to make this board were new, except for 8250's,
> > 8212's & the CPU. These were bought 'as' NOS. I have a CPU tester so
> > that's ok and have tried several.
> >
> > I could swap the 8212's but since it works on v1.2 it 'must' be ok
> > for v2.3 ?
> >
> > I got rid of my HP Agilent 16xx Logic Analyzer. I had all the pod's
> > and clips but the darn thing didn't have a "save". Got tired of setting
> > it up all the time cuz it would forget when you turned it off.
> >
> >
> > ----- Original Message -----
> > From: "Crusty OMO" <cru...@hotmail.com>
> > To: n8vem...@googlegroups.com
> > Sent: Sunday, February 22, 2015 8:46:54 PM GMT -06:00 US/Canada Central
> > Subject: RE: [N8VEM-S100:6414] Re: IMSAI 8080A CPU board help.
> >
> >
> > Todd,
> >
> > That is really really weird! I am going to assume you are moving the Shadow ROM kill jumper right? And you have the 8212 chip for the output port installed (IC-J5)?
> >
> > At this point, I would hook up the analyzer and watch the activity on the bus... If you are in the neighborhood, you can drop by and we can swap chips to see if there's something intermittent about one of them?
> >
> > Regards,
> > Josh
> >
> >
> >
> >
> > Date: Sun, 22 Feb 2015 12:40:59 -0800
> > From: litte...@gmail.com
> > To: n8vem...@googlegroups.com
> > Subject: Re: [N8VEM-S100:6409] Re: IMSAI 8080A CPU board help.
> >
> >
> > Update !
> >
> > With only the CPU board <no prop i/o> I am able to boot/load the monitor and CP/M
> > using v1.2 firmware and related files. I'm not familiar with the monitor syntax. Is this
> > a common monitor program ? I'd like to know how to use it.. Otherwise I can load
> > CP/M and get the a> prompt. A "dir" command gives me one file MON-32K.COM.
> >
> > Also, as mention in another thread, I was having an issue using v2.3 and a memory
> > error. I did the test Josh had recommended to Jeff to test the lower RAM chip with the
> > command R 00 7F. It took a bit but ran and passed. I switched the two memory chips
> > and they all passed.
> >
> > At this point I want to 'assume' my hardware is good, but my setup doesn't like v2.3 yet.
> >
> >
> >
> >
> >
> >
> >
> > On Saturday, February 21, 2015 at 10:52:17 PM UTC-6, litterbox99 wrote:
> >
> > Josh,
> >
> > I'm now using a comm port on the CPU board (w/HyperTerm & WinXP) & (The Console I/O) on the other.
> >
> > They echo/mirror each other for key press & screen, but it still won't respond to anything but < R >
> > for the Ram test that fails @042A
> >
> > Todd
> >
> >
> > ----- Original Message -----
> > Todd, The firmware outputs to both the 8250 UART port 0 on board (I/O 20h) and to the Console I/O board at I/O 00h.
> > It will also accept any input from either console. If you connect them both, then you'll see a duplicate.
> > I was thinking of writing a seek and employee routine that would send messages to a range of I/O address and scan them all for a response ie, "Press <CR> to continue", but the variations were endless and such programming would take too much time. So I just hard coded support for the CONSOLE IO to the routines that already work with the on board uart.
> >
> > Cheers, Josh
> >
> > --
> > 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 n8vem-s100+...@googlegroups.com .
> > For more options, visit https://groups.google.com/d/optout .
> >
> >
> > --
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> >
> > --
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>
>
> --
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> From: litte...@mchsi.com
> To: n8vem...@googlegroups.com
> Subject: Re: [N8VEM-S100:6427] Re: IMSAI 8080A CPU board help.
>
> Josh,
>
> I've studied the scheme's, ohm'd out traces, pulled chips, looked under a
> magnifier till my eyes bled and even scanned the solder side on my flat bed
> scanner to view under magnification. No solder bridges found.......
>
> It should not work, but I'm happy it does. I need a second set of eyes.
> If someone would take a look, perhaps I missed something, maybe it's not
> jumped correctly;
>
> https://sites.google.com/site/litterbox99/_/rsrc/1424722167817/home/img055.jpg?height=167&width=320
>
> The scenario is, no prop I/O just com port;
>
> Version 1.2 will boot Rom & load/run Monitor & CP/M with SD Card with J5 2-3, nothing if J5 1-2.
> Works ! Yeah !!!!!
>
> Version 2.3 will boot from Rom and display banner/menu. SD card not found. J5 position doesn't matter.
>
> Keyboard only responds to "R" nothing else. If there is no keyboard input it will do
> five dots + space + five dots... <infinite repeat> Looks like want's to boot the SD
> card, but it wont.
>
> I'd like to resolve this with v 2.3 so I can use the prop I/O and no com port.
>
>
> Todd
>
>
> ----- Original Message -----
> From: "Crusty OMO" <cru...@hotmail.com>
> To: n8vem...@googlegroups.com
> Sent: Monday, February 23, 2015 8:03:33 AM GMT -06:00 US/Canada Central
> Subject: RE: [N8VEM-S100:6417] Re: IMSAI 8080A CPU board help.
>
>
> Todd,
>
> The Shadow ROM Kill Jumper JP5 moves from 1-2 when using v1.2 firmware to 2-3 when using v2.3 firmware.
> Ignoring the funny similarities in the jumper/version numbers... keeping the jumper in 2-3 when using v1.2 should not allow you to run CP/M. Wait! it shouldn't allow you to run the monitor either... in that version, the boot loader copies the ROM contents to upper RAM, then it writes a jump instruction into lower (Write Only) RAM, that instruction is written just after the OUT instruction that will kill the ROM... Bottom line, if v1.2 works with jumper in 2-3, then there's some kind of short in those circuits. Pull out that jumper and try following each trace and ohm it out with adjacent traces. I haven't heard of anyone having problems with micro shorts from PCBCART, I'm using 12mil spacing, which is a lot. It might be a solder short ? Happy Hunting!
>
> Regards,
> Josh
>
>
>
> > Date: Sun, 22 Feb 2015 21:28:32 -0600
> > From: litte...@mchsi.com
> > To: n8vem...@googlegroups.com
> > Subject: Re: [N8VEM-S100:6415] Re: IMSAI 8080A CPU board help.
> >
> > No, I did not move the kill jumper. Stayed at 2-3 all the time.
> > All components used to make this board were new, except for 8250's,
> > 8212's & the CPU. These were bought 'as' NOS. I have a CPU tester so
> > that's ok and have tried several.
> >
> > I could swap the 8212's but since it works on v1.2 it 'must' be ok
> > for v2.3 ?
> >
> > I got rid of my HP Agilent 16xx Logic Analyzer. I had all the pod's
> > and clips but the darn thing didn't have a "save". Got tired of setting
> > it up all the time cuz it would forget when you turned it off.
> >
> >
> > ----- Original Message -----
> > From: "Crusty OMO" <cru...@hotmail.com>
> > To: n8vem...@googlegroups.com
> > Sent: Sunday, February 22, 2015 8:46:54 PM GMT -06:00 US/Canada Central
> > Subject: RE: [N8VEM-S100:6414] Re: IMSAI 8080A CPU board help.
> >
> >
> > Todd,
> >
> > That is really really weird! I am going to assume you are moving the Shadow ROM kill jumper right? And you have the 8212 chip for the output port installed (IC-J5)?
> >
> > At this point, I would hook up the analyzer and watch the activity on the bus... If you are in the neighborhood, you can drop by and we can swap chips to see if there's something intermittent about one of them?
> >
> > Regards,
> > Josh
> >
> >
> >
> >
> > Date: Sun, 22 Feb 2015 12:40:59 -0800
> > From: litte...@gmail.com
> > To: n8vem...@googlegroups.com
> > Subject: Re: [N8VEM-S100:6409] Re: IMSAI 8080A CPU board help.
> >
> >
> > Update !
> >
> > With only the CPU board <no prop i/o> I am able to boot/load the monitor and CP/M
> > using v1.2 firmware and related files. I'm not familiar with the monitor syntax. Is this
> > a common monitor program ? I'd like to know how to use it.. Otherwise I can load
> > CP/M and get the a> prompt. A "dir" command gives me one file MON-32K.COM.
> >
> > Also, as mention in another thread, I was having an issue using v2.3 and a memory
> > error. I did the test Josh had recommended to Jeff to test the lower RAM chip with the
> > command R 00 7F. It took a bit but ran and passed. I switched the two memory chips
> > and they all passed.
> >
> > At this point I want to 'assume' my hardware is good, but my setup doesn't like v2.3 yet.
> >
> >
> >
> >
> >
> >
> >
> > On Saturday, February 21, 2015 at 10:52:17 PM UTC-6, litterbox99 wrote:
> >
> > Josh,
> >
> > I'm now using a comm port on the CPU board (w/HyperTerm & WinXP) & (The Console I/O) on the other.
> >
> > They echo/mirror each other for key press & screen, but it still won't respond to anything but < R >
> > for the Ram test that fails @042A
> >
> > Todd
> >
> >
> > ----- Original Message -----
> > Todd, The firmware outputs to both the 8250 UART port 0 on board (I/O 20h) and to the Console I/O board at I/O 00h.
> > It will also accept any input from either console. If you connect them both, then you'll see a duplicate.
> > I was thinking of writing a seek and employee routine that would send messages to a range of I/O address and scan them all for a response ie, "Press <CR> to continue", but the variations were endless and such programming would take too much time. So I just hard coded support for the CONSOLE IO to the routines that already work with the on board uart.
> >
> > Cheers, Josh
> >
> > --
> > 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 n8vem-s100+...@googlegroups.com .
> > 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 n8vem-s100+...@googlegroups.com .
> > For more options, visit https://groups.google.com/d/optout .
> >
> > --
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>
>
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