Hello everyone. I've got an Apple 2+ that I found in my childhood attic that I am trying to bring back to life, but am not sure how to proceed. I've bolded the current sticking points I am experiencing in getting it to operate.
The computer came with the following expansion cards:
Language Card - 670-X006, Expands memory to 64K, must be in Slot 0.
Videx VideoTerm - 80 column display card, must be in Slot 3 It also has a small add-on board that slots into the 9334, but utilizing the chip in the add-on board, I still do not receive any video from this card.
Apple 650-X104 Disk ][ Drive Card - Enables floppy controller communication, must be in Slot 6
Z-80 SoftCard - Microsoft SoftCard, enables device to run CP/M, Slot 4
Asynchronous Serial Interface - Model 7710, enables serial communication over port (Not sure which Slot this goes in.
Upon initial startup, the unit would only display an array of alternating ??DD lines, filling the 24x40 display.
See the Initial Startups image.
After I removed each ROM chip and cleaned the legs with 50% isopropyl alcohol and a lens cloth, and removed/remounted each of the 24 RAM chips, I'm making it a little farther. I see that initial screen for a second, followed by a filled screen of blocks (the empty spaces look something like upside down exclamation marks), followed by a screen full of 8's. This is where the computer freezes now. Resetting the computer with the reset key sometimes gets it to the filled screen of blocks, sometimes 8's, sometimes it cycles between the two. Lately it's instead been filling the screen with 0's.
See Block Screen image.
See Screen of 8s image.
I have been unable to identify a single red wire that seems to come out of the same location on the unit as the keyboard wires. It is not attached to anything and is instead free-floating, so I route it out of the machine to avoid shorting it against anything.
I've tried running the system with just a single bank of 8, as I read in other forums. I've also tried running the unit in various other configurations (with and without the language card). Most of my present attempts involve utilizing the language card but keeping all other cards disconnected. What are my next steps?