Hi, I already post this question on AppleFritter, but I still don't have solved it.
I need a help for my apple IIe. Infact, starting the self-diagnostic test, I obtain on my monitor the following string:
"RAM: F13 F12 F11 F10 F9 F8 F7 F6"
Or sometimes
"RAM:"
Searching on the net, I tried everything:
I have changed the following ICs:, SN74LS125N, 74S109, SN74S10N, and ONE 4264 (this one for testing if the message changes)
I have also cleaned the pins of the ROMs, MMU and all the chips on sockets.
i've changed all the electrolytic capacitors too.
But the problem still remain.
Note that I'm able to write basic instructions and the apple IIe run them, but none of my software on floppy works:
I receive the message "UNABLE TO LOAD PRODOS" or sometimes "A1DD- A=28 X=FA Y=40 P=38 S=E6
*"
I tried with 3 different drives, 2 controllers and about 20 floppy disk (two drives and one controller was bought from Waine Bibbens and he tested them), but I've obtained the same results,
I have also bought one IOU from ArcadeComponents.com, but not exactly the same chip because seems impossible to find: in my Apple IIe there is a 344-0022-A, but I have bought a 344-0021 (they told me this is an international version of the chip)
After changing the IOU chip the computer is not able to start the Self Diagnostic Test: trying to start the Diag pressing the keys or leaving the keyboard disconnected, result in a blank screen or sometimes displays a random number like C431* or C423*.
Unfortunally I'm not able to find another Apple IIe for other tests.
Please help me
Alex
P.S. My Apple IIe is an italian/PAL version, built in 1984
I need a help for my apple IIe. Infact, starting the self-diagnostic test, I obtain on my monitor the following string:
"RAM: F13 F12 F11 F10 F9 F8 F7 F6"
Or sometimes
"RAM:"
Searching on the net, I tried everything:
I have changed the following ICs:, SN74LS125N, 74S109, SN74S10N, and ONE 4264 (this one for testing if the message changes)
I have also cleaned the pins of the ROMs, MMU and all the chips on sockets.
i've changed all the electrolytic capacitors too.
But the problem still remain.
Note that I'm able to write basic instructions and the apple IIe run them, but none of my software on floppy works:
I receive the message "UNABLE TO LOAD PRODOS" or sometimes "A1DD- A=28 X=FA Y=40 P=38 S=E6
*"
I tried with 3 different drives, 2 controllers and about 20 floppy disk (two drives and one controller was bought from Waine Bibbens and he tested them), but I've obtained the same results,
I have also bought one IOU from ArcadeComponents.com, but not exactly the same chip because seems impossible to find: in my Apple IIe there is a 344-0022-A, but I have bought a 344-0021 (they told me this is an international version of the chip)
After changing the IOU chip the computer is not able to start the Self Diagnostic Test: trying to start the Diag pressing the keys or leaving the keyboard disconnected, result in a blank screen or sometimes displays a random number like C431* or C423*.
Unfortunally I'm not able to find another Apple IIe for other tests.
Please help me
Alex
P.S. My Apple IIe is an italian/PAL version, built in 1984
