Apple Cluster Controller (1983)
Standalone controller linking serial devices toIBM3270 networks, documented by UPI in December1983 and Apple sales guides. Manufactured by Protocol Computers,Inc., according to Apple.

Illustrative recreation of broad box form, not a photograph or exact reconstruction. No proof of port or protocol variant. Uncertain indicator counts removed; private reference photo is not published or assumed free.
Specs
| Ports | 3 / 7 × RS-232C, depending on model |
| Extras | Z80A · 16 KB ROM · 32 KB RAM |
Documented year
UPI's contemporary28December1983 report describes Apple Cluster Controller with three or sevenRS232 ports for Lisas and serial printers. Evidence of documentation in1983, not an exact first-sale or launch day.
Architecture and connection
Apple's September1985 revised guide identifies Protocol Computers,Inc. as manufacturer, with8-bitZ80A,16KB ROM,32KB RAM and internal power supply. The ACC appears toIBM as3274/3276 controller and uses asynchronous ASCII VT100-type terminals overRS-232C.
Variants and illustration
BSC and SNA/SDLC need different versions. Up to seven devices does not mean all units have seven ports: three- and seven-port models are distinct.3278-2 terminal and3287-1 printer emulation are listed.
Illustrative recreation of broad box form, not a photograph or exact reconstruction. No proof of port or protocol variant. Uncertain indicator counts removed; private reference photo is not published or assumed free.