https://ia802704.us.archive.org/28/items/byte-magazine-1989-05/1989_05_BYTE_14-05_Unix_CAD_and_Technology_Breakthroughs.pdf
Page 76 physical
Accelerate Those Model 50s and 60s
The Hummingbird 50/60 is a 20-MHz 80286-based add-in board that boosts
the performance of your IBM PS/2 Models 50, 50 Z, and 60 up to that of
the 80386-based 20-MHz Models 70 and 80. It also includes 3270-emulator software.
To install it, you use a special "chip-puller" tool to remove
the 80286 from the original motherboard. You plug the adapter module
into the Hummingbird adapter card, which you plug into the Micro Channel
slot.
Once your installation is complete, you've got a zero wait-state,
20-MHz, CMOS 80286 chip and 32K bytes of 55-ns static RAM. The cache
is updated during direct-memory-access reads, and there's a programmable
cache for adapter ROMs .
Manufacturer Polywell claims the new system operates
exactly as before-with the same support for the 80287
chip, for example.
For software that is dependent on the slower clock speed,
the HiSpeed program is available to temporarily disable
the cache. The 3270 emulation works at all speeds.
Price: $995 .
Contact: Polywell, Inc . , 6 1 C
Airport Blvd . , South San Francisco,
CA 94080, (4 15)
583-7222
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