Is there a way to perform a diagnostic on an Apple iie so that we can be sure 100% that the motherboard is working?
I usually verify systems by running some memory and CPU tests, like XPS Apple-Cillin and other general diagnostics. Some from Apple. Run a CPU test, a rom checksum test, ram test, speaker tone ramp, full screen color and pattern check, game port a/d check. Not forgetting the text screen and character set. Test each keyboard key.
And then put the system through its paces by copying some disks, running a drive verification program that looks at settling, skew, speed, alignment, slack, and read/write test. Write protect switch. Run some enhanced programs that utilize MouseText and 80 columns and Auxiliary Memory, including DHR graphics, and standard HGR & LoRes graphics. And of course the standard 40 column display. Try some cards in different slots..
Try out AppleWorks, ProTerm, and some games. Including Integer and Applesoft games. Machine language games too. This covers a lot of functionality and has the benefit of using real world software.
I'm sure something official is listed in the tech service procedures. So perhaps look there too.
Maybe someday soon I'll make a concise list of disk images to use and write up an all-inclusive step-by-step verification procedure. Yes! That could be a fun autumn project!
Before running any form of diagnostic software, I would always start with the built-in system test.
To run the built-in test, push both the [open apple] and [closed apple] keys on startup. Or if the machine is already running, push [open apple], [closed apple], and reset.
If the Apple //e in question is a platinum model, substitute [closed apple] with the [option] key.
If all is well, you will get the message of either "KERNAL OK" (on an unenhanced //e) or "System OK" (on an enhanced //e); otherwise you will get an error message indicating what is wrong (Google will be your friend in this case).
Hope this helps,
The Apple //e Diagnostics Card was the best way to fully diagnose an Apple, but unfortunately they are quite rare (speedyg was working on reverse engineering one a little while ago, there is a post about it).
Without that, I would suggest the following:
- Run the built-in system test by holding OpenApple + CloseApple while turning power on (as others have said)
- If SYSTEM OK, try one of the many diagnostic disks that are out there.
- Start with Apple IIe Diagnostic V2.1. MECC Computer Inspector is also very good, as is Apex II. Master Diagnostic //c is also very good for the //c line, but obviously not for //e. All are available through Asimov.
- If all that fails, short of having an oscilloscope, the only way to check a motherboard would be to replace all chips with those from a known working logic board.
Sorry to reopen an old thread, but it seems a good place to start for me.
I have a good condition IIe, standard version without a keypad.
On boot, all I get it horizontal bars. The keyboard light is on. No response from keyboard. No power on beep. Reset dose nothing. Pressing open & closed apple keys then powering on dose nothing. Same with or without extra ram card installed. I have reseated all socketed IC's. There looks to be no physical damage. No burnt smell anywhere on the main board. Googleing IIe and horizontal bars gives up little.
Suggestions for next step in diagnostics?
With horizontal bars and no beep, I think your processor is likely the issue. Bad, bent pins or in backwards