"Mystery" Eprom Adapter?

[+Larry]

Several years ago, I bought some surplus eprom assortments (cheap) that included 27C010 (32-pin) devices. But they came with 28-pin adapters which have two small IC's on the adapter mini-board. These are 74HC133N and a 74HC160. I know nothing about these, but presume the IC's provide some type of banking arrangement. (?) I've been unable to find any info on the 'net as to how these might be used. Has anyone seen something like this before and have any clue how I might find some info about them?

 

Thanks,

Larry

[+bcombee]

The 74HC133N is a 13-input NAND gate, while the 74HC160 is a BCD counter. This seems to allow multiple bank access -- probably the NAND gate is tied to the address bus in a way that hitting the right address increments the counter, which is used to select the high-bits of the address on the EEPROM chips. The counter is triggered by the logic line transition.

[classics]

Sounds like a 'large eprom' programming adapter that was available for a lot of device programmers with 28/32 pin sockets.

 

Needham programmers come to mind, I remember just such an adapter for the PB-10.