So, I got myself all the TTL ICs that were supposed to be defective on the motherboard, I burned a new UVPROM with a French video generator, plus I made some corrections on the board :
After having done this modifications, again, nothing worked, exept a flashing white/black screen. At this stage, an very imortant thing : To start, an Apple //e need to have its keyboard attached!
After have plugged the connector of the keyboard and switched on again, TaDa :
|The first Propgramm since... a very long time.|
In this configuration, the main board is equiped with a 64K Apple memory card and runs the basic interpreter as soon as power is turned on : great!
Now, I have to put this main board with the PSU and the keyboard back into the original case, and to test the two floppy drives with the expansion board.
And after have placed the cover and powered this Apple //e :
The 74LS125 burned without reason. A check of the voltage revealed a very good value of 4,97V on it! I never saw that befor, exept with the good reason of overvoltage.
The trace of smoke deposited on the top of the floppy drive indicates that the 74ls125 has reached a very high temperature... So I replaced it with a new one :
Finally, the system works very well with the two drives attached on it :
|CTRL + CLOSED APPLE + RESET or APPLEs at POWER UP|
But I don't have any Pro DOS floppy to boot with. And I don't know how to find that! Actually I must stop the boot process with the CTRL/RESET keys and go to the internal Basic interpreter. A good solution could be the use of an Apple // disk drive emulator like this :
Extension cards for the Apple II?
ADP Pro :