Intel Docs

8255A Programmable Peripheral Interface

8259A Programmable Interrupt Controller

8237A Programmable DMA Controller

8254 Programmable Interval Timer

OKI Docs

80C85 8-Bit CMOS Microprocessor

Seiko Docs

Seiko G1216B1N000 Users Manual (900 kb)

Other

8085A Instruction Set Summary