First post, by smevans526
If there is a better thread for retro Macintosh Hardware, let me know, and I apologize in advance for posting here.
Anyway, I got my hands on a vintage Quadra 630cd, on which I will install Apple A/UX. For those who don't know, the 630 has an LC-style 33mhz quadra, which is not going to be ideal for compiling C code. So I plan to install a 68040 with an FPU. On ebay, the 40mhz variety seem to sell cheaper than the 33mhz, so I plan to get a 40mhz, install it for the FPU, and if I get the time a few months from now, 'overclock' the system to 40mhz.
I am caught off guard by the variety of model numbers, and thought I should inquire if I got the right thing on ebay.
The model I am interested in is MC68040RC40A.
My Quadra has XC68040RC40M.
I believe that MC is a reference to a later version of the chip that resolved some bugs. I am under this impression based on the following published on NXP's website:
https://www.nxp.com/docs/en/product-change-no … /PCNR00274.html
RC is the 68040 with the FPU and MMU, opposed to LC and EC lines. So I want the RC.
I believe that the 'A' on the end of 'MC68040RC40A' is maybe a reference to the time or series of production, likely the A-Line started with Motorola Semiconductor's absorption by NXP.
For any corrections, please let me know. My main reason for posting is to check my understanding of this chip.
I also inquire if anyone has comments concerning counterfeits. Perhaps some of you have seen Shane McRetro's experience on youtube...
https://youtu.be/4_t4jBz-Jts
I am amazed by how abundant the 40mhz chip is. I guess NXP kept producing it well into the 2010s. Based on the below link to the NXP website, it looks like their last shipment was 2015.
https://www.nxp.com/part/MC68040RC40A#/