Repairing Apple 5.25″ Drive (A9M0107) for Apple IIGS

Arrived the Apple 5.25 inch Floppy Drive for Apple IIGS (A9M0107) from US (almost spent one month!). The seller said it tested working. Great!

But unofrtunately it was not worked correctly. No seek sound at the boot, with no lamp. No problem, start fixing.


Open the screw just with two from the back of the disk, slide the top panel to the back. Easy opening.


Next, remove a screw of the next of the FDD connector. Now you can open the FDD drive top shield. It hardly attached to the FDD drive basement, so open with thin driver with slowly and carefully.



After removed the top shield, found the IC board of the FDD. Simple design, few electric parts.


Found it. The connector to the IIGS was almost off, by unknown shocks among the transferring. Just connect again. Completed.


The board was printed with old Apple computer logotype, on 1986, with “UNIDISK ANALOG #2”, but this drive is not the older “Unidisk 5.25 Drive” (A9M0104). It might shared the board from the last unidisk, or something. Unknown.


The drive is ALPS electric, made in Japan. One inch height, bigger than latest general 1/2 height 5.25″ FDD for PC/AT.


Close the top shield and cover, connect to the 3.5″ drive, and booted again. Works correctly. Easy repairing.


Apple IIGS (ROM 01) Battery Replacement (Easy Version)

The internal battery of my new Apple IIGS (ROM 01) was dead completely, so it cannot hold some setting value like date time, screen color, slot configuration, RS232C value, and so force.

I decided to replace to newer one. This article shows how to replace the internal battery of IIGS ROM 01, with almost easiest working.

Open up the IIGS, remove power unit (just unlock with one notch in front sidem and pull out the power line), you’ll see the big battery just half size of AA.

Unfortunately the ROM 01’s battery was fixed to main board and cannot replace easily. I planned to replace with new battery holder for replacing in the future.

Here’s a picture of dead battery. Fixed with solder to mainboard.


Cut out the lead line of the corner of “L” by nipper, leave the “I” line for attaching new battery holder. Don’t remove the whole lead line completely if you want to avoid hard work of solder operations (might be damaged to the main board).


The completely dead 1/2 AA size battery was made on March, 1987. Vintage one. It might almost same birthday as my IIGS itself.


I ordered new battry box with lead line, and new 1/2 AA battery for replacement. You can purchase them at some electric parts shop with cheaper, just 300JPY each (almost 3USD each).  You can also find them in ebay, but much higher price than parts shop.

If you live in Japan, you can find from here and here.


To avoid solder operation for avoding big damage to the IIGS main board, I replace the lead line of the new battery case to another capped line as below. Just a easy work with solder. Well done.


Just cap the new lead line to the left “I” line (from older battery) of the IIGS main board. Upside is plus, so place red line to here. The original place of the battery is little smaller than the battery case, so placed the new battery holder to the side of mainboard, with double-sided tape.


Re-attached power unit and connect the power line to mainboard. Completed.


Test power on, and set date time and screen color, and power down. After some second, power on again, and you’ll see the new setting screen color and date time already set.


If not, check the lead line of the battery holder. Good luck.

My First Apple II, Apple IIGS



Arrived my first Apple II, Apple IIGS ROM 01 version. Great 16-bit, good old Apple machine. Lovely big rainbow apple!!

I wanted to have my own Apple II for a long time, from my elementary school. But unfortunately, it was not common platform in Japana. I could not find any Apple II in my hometown.

After over 20 years, I decided to have my Apple IIgs as my first Apple II experience. Ordered and sent from the USA, but unfortunately some keytops were broken due to no aircap coverage. Oh, vintage GS Apple keyboard!

Fixed them with putty and glue, now the system works correctly on my desk. It contains GS AppleColor monitor, Apple Keyboard (made in Japan),  Apple Mouse (made in USA), and two Apple 3.5 Drives.

The internal battery was already dead so I’m going to replace it later. Post the replacement process soon. (Update: see here).