Note 1. The piezo element in the 41CL is driven by the same voltage as in the 41C, and is the same size as the original, but is not quite as loud. This applies to all board revisions.

Note 2. We use replica Port covers to hold the serial connectors. The dimensions of these replica Port covers differ very slightly from the originals. The difference is not enough that I noticed it, but one user has commented on it.

Note 3. I just discovered that the YFWR function does not prevent writing to the OS area! So be warned that you should NEVER try to write to the OS area of the Flash, or you will brick your calculator like I just did.

This warning applies to ALL versions of YFNZ (and YFNS) prior to version -3B.

The batch number and serial number of the 41CL board is located on a small sticker on the back of the board. For release notes specific to the batch, click on the batch number below.

Batch B15834 was the Alpha units. Only 2 were fabricated, but none were released to users.

Batch B20955 (notes updated 04/24/2012) was the Beta units. 25 were fabricated, and 22 were sent to users. On 1 board the CPLD refused to program, 1 board was accidentally destroyed during testing, and I kept 1 for myself.

Batch B24415 (notes updated 05/18/2012) was the first production batch. 50 were fabricated, and 49 were sent to users. 1 unit was rendered inoperative while trying to solder the jumper.

Batch B28287 (notes updated 05/18/2012) is the second production batch. 50 were fabricated, and 34 have been sent to users so far.