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This is a 4-bit microcontroller with on-die mask ROM and RAM. This was apparently made in co-operation between Iskra and AMI; the US market saw this as AMI S2000 series.

• http://www.bitsavers.org/components/ami/_dataBooks/1979_AMI_MOS_Products.pdf
• http://www.bitsavers.org/components/ami/s2000/AMI_S2000_Programming_Manual_Rev2_Jun78.pdf
• https://hackaday.io/project/188614-iskra-emz1001a-a-virtual-resurrection

Package

(Logo) 2486BLYU
261201
EMZ 1001E

Die

9346080C