The EF ROM is the first ome the CPU starts running instructions from so if your horizontal bars are caused by a ROM issue, It'll almost certainly be the EF ROM at fault. This allows the user to have the latest version of the diagnostics. The ROMs are a little harder to get hold of but the contents can be downloaded and burnt onto blank eproms. Beginning with an update to macOS 10.12 Apple changed the behavior of the Apple Diagnostics from booting from a local copy on the drive to booting an online version accessed from an Apple server. The forst things to try are the 6502, the RAM and the ROM.
Next thing to try (or the first thing to try if you don't have an oscilloscope) is to swap out some ICs and see if it makes any difference. No clock means and issue in the clock generator, other signals looking odd could be a variety of things and a problem with the R/W line is probably the CPU. Also the R/W line should show signs of switching between 5v and 0v. See if anything looks odd on the data and address busses (there should be signals switching quickly between 5v and 0v). Look at the clock pins first and see if there is a clock signal at all (it should be a 1MHz 5v square wave). If you have an oscilloscope, look up the pinout for the 6502 and see what the signals in and out of it look like. Your next steps will depend a bit on what you have to hand. This could be a dead CPU, dead RAM, dead ROM, timing issues, etc. Apple Diagnostics CATALOG I/O ERROR Screenshot: You may be interested in these files: Ramtest A2 Dealer Diagnostic V3.0 Diagnostics Iie Apex Ii Apple.
The horizontal bars mean that your processor is a sign that your IIe is not managing to run any unstructions in its firmware. 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. I'm sure something official is listed in the tech service procedures. View Fees, Profiles, Ratings, Address, Phone Numbers and more. This covers a lot of functionality and has the benefit of using real world software. Apple Diagnostic Centre is one of the Best Diagnostic Centres in Vijayawada. Try out AppleWorks, ProTerm, and some games. However, what do the cryptic codes mean when a piece of hardware has failed the scan Follow the guide below to figure it out.
And of course the standard 40 column display. Apple's Diagnostics utility is great at testing for hardware trouble. Run some enhanced programs that utilize MouseText and 80 columns and Auxiliary Memory, including DHR graphics, and standard HGR & LoRes graphics. Test each keyboard key.Īnd 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. Not forgetting the text screen and character set. Run a CPU test, a rom checksum test, ram test, speaker tone ramp, full screen color and pattern check, game port a/d check. I usually verify systems by running some memory and CPU tests, like XPS Apple-Cillin and other general diagnostics.
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