(07-04-2019 01:15 PM)Alexkumt Wrote:  ... as a second problem the system displays both the characters from the keyboard, but any command is rejected with "Error 88 SMT Bad"
example "3 + 3" instead of answering 6 gives me the same error
"Error 88: BAD STMT"

(07-04-2019 03:39 PM)smp Wrote:  When the system powers up, you are in BASIC, so, indeed, you are entering a bad statement. Try: Print 3+3<CR>

You have to enter proper BASIC statements in immediate mode, or enter a line number for each statement if you want to build up a multi-line program.

(07-04-2019 07:12 PM)rprosperi Wrote:  Actually, HP BASIC (and likely many others, but I don't have access to them to check) allows commands such as "3 + 3 [END LINE]" as valid, as there is an implied DISP command inserted by the OS. So typing that should return 6.

(07-10-2019 10:22 AM)Alexkumt Wrote:  Is there a possibility to have the wiring diagram of the motherboard of the HP-86B?

(07-19-2019 05:44 PM)Alexkumt Wrote:  now I have news about this problem. in fact, after connecting the computer to an HP monitor, I could see the first missing line. when I turn on the computer it displays nothing, even waiting for several minutes. however, when I press a button, a Warning "Warning 101: LANG UNDEFINED" message appears, then any command I issue always leaves the error "Error 88: BAD STMT" pressing the Run button, this appears instead "Error 48 on line 99999: End

(07-19-2019 09:43 PM)Alexkumt Wrote:  this is the motherboard, in red I highlighted the dip-switches

https://imge.to/i/5oR86

(07-20-2019 01:50 AM)Paul Berger (Canada) Wrote:  

(07-19-2019 09:43 PM)Alexkumt Wrote:  this is the motherboard, in red I highlighted the dip-switches

https://imge.to/i/5oR86

You can find the service guide for 86B at http://www.akso.de/fileadmin/Series_80/Assembly_Level_Service_86B.pdf on page 4-24 of the manual the settings for SW2 are defined, I cannot tell from you picture which way the switches are set, however in my experience the rocker type can be especially flaky you may want to rock them back and forth a few times to make sure they are closed, and verify the connections using a meter. Unfortunately the scan of the schematics in that manual are pretty poor but you can see that on one side of that switch is connected to non-inverting buffer outputs and the inputs are grounded. There is another signal connected which is likely an enable signal, so my guess is that when the 86B starts up the buffers are enabled and the switch read and then the buffers are turned off. Near as I can tell from the schematics the switch is connected to some of the column lines, so that would be the reason for the non-invert buffers, so it could be read and then get out of the way. Best guess is the non-invert buffer chip is the 1820-1402 (74LS365) right behind the switch but you could confirm with a meter.

If the enable signal never arrives or one of the buffers is defective it could lead to the LANG warning. That switch is unfortunately missing from Tony's schematic, perhaps it only appeared in later revisions of the 86B, and the schematic section of the service guide for the switch is pretty blurry.

I also happened upon a manual "Introduction to 86B Local Language" on hpmuseum.org and found your message in there "101 (Warning) LANG UNDEFINED Computer hardware is not properly configured for local languages - the computer requires servicing"

Paul.

(02-08-2020 05:25 AM)Alexkumt Wrote:  I thought of using the software emulator for HP87 to trace the cause of the problem through Disassembler.
...
I thought I would find help from an expert person in interpreting the disassembler part.

probably if there is some electrical noise in the hardware in that part. the problem could perhaps be traced back to them.

(02-08-2020 09:14 AM)J-F Garnier Wrote:  You may try this test: type several space characters then ENDLINE. On a good system, there is no error and the blank line is just ignored.

J-F