Originally published by mafe72.

This adapter converts the pin-outs of the parts listed below (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.

The supported EPROMs 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)

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 are programming a 27C322 EPROMs, move the switch to the Position 27c322, for 27C160 , 27C400 and 27C800 EPROMs, switch must be in the Position other.

Split the source file into parts of 512Kbytes using HJSplit.

Launch the MiniPro (or XGPro) software, select AMD 27C4096 DIP40 device, deselect Check ID and set Pulse Delay to 50us. You may also optionally reduce VPP Voltage to 12.50V, depending on your EPROM's datasheet and programming success.

The EPROM can now be accessed as if it were a 27C4096 device, 512kB at a time, as configured by the DIP Switch:

27C400: program all 512kB in one pass.

27C800: program in 2 (two) 512kB passes.

27C160: program in 4 (four) 512kB passes.

27C322: program in 8 (eight) 512kB passes.

(see the last image of this project).