Code reader for 1994 c class?

Hi guys, How about a code reader for pre OBDII Mercedes, or a PC interface, any info will do.
Tnx Tage Copenhagen

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Late model (90s) W126 (S class) has a push button and LED at the firewall. I am not sure about pre-OBD II W202 but even if it has PC interface, it is probably proprietary.
Tage Madsen wrote:

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