16 Bit EPROM 40/42 pin ZIF adapter for TL866 MiniPRO

The supported EPROM parts are:

• 27C400: 40-pin, 4Mbit (256k x 16-bit, 512k x 8-bit)
• 27C800: 42-pin, 8Mbit (512k x 16-bit, 1M x 8-bit)
• 27C160: 42-pin, 16Mbit (1M x 16-bit, 2M x 8-bit)
• 27C322: 42-pin, 32Mbit (2M x 16-bit, no 8-bit access mode)

The adapter converts the pin-outs of the above parts (which is similar to contemporary DIP-packaged mask ROMs) to 27C4096 pin-out as supported by the readily-available and cheap TL866 series of USB programmers.

Usage

Insert the programming adapter into the TL866 with the socket handles adjacent to each other. Insert the EPROM into the lowest-possible position in the adapter and with pin 1 nearest the handle.

If your adapter has a 27C322-mode push switch, press it always and only when programming 27C322 IC’s.

EPROM can now be accessed as if it were a 27C4096 device, 512kB at a time, as configured by the bank-switching handled jumpers:

• 27C400: no need to set jumpers, program all 512kB in one pass.
• 27C800: program in 2 512kB passes: A18=0 (bank 1), then A18=1 (bank 2)
• 27C160: program in 4 512kB passes: A19/A18=00,01,10,11 (banks 1,2,3,4)
• 27C322: program in 8 512kB passes: A20/A19/A18=000,001,010,011,100,101,110,111 (banks 1,2,3,4,5,6,7,8)