Philips CM-153 LMSI Reproduction Card

This project aims to reproduce the LMSI CM-153 card needed to operate a Philips CM-100 CD-ROM drive. This drive was originally released in 1985 and used an early version of the LSMI protocol to connect. Later versions of LMSI cards, such as the CM-260, are not compatible with earlier drives (I do not know what the exactly compatibilities are). So an early card is required. The CM-153 is a very uncommon part to find due to it's limited use, high cost, and the fact that it would probably be tossed out with the computer when upgraded being separated from its original drive.

Thanks to Roland who has a working CM-100 and CM-153 we have some pretty high quality reference images of what this card looks like. It uses all off the shelf 74 series logic chips and one 8251A UART controller. It should therefore be possible to recreate without needing any rare chips or ROM dumps.

Current Status

The card has been fully reverse engineered and tested to be functional. It has been demonstrated to work using this driver with a CM100 drive.

Notes

A more acurate build will put 7121 in a socket as it must be removed to use the card with an internal drive. If you just want to use it with an external drive this can be ommited.

The selected DB-15 connector doesn't include the screw nuts which can be purchased separately.

Parts List

(Parts picked on 2022-09-07 and reflected best available stock)

All SMD parts 1206 size.