Spehro Pefhany wrote:
The 2708 is similar to larger, newer EPROMs
except for the extra supply voltages, for reading.

However, IIRC, it uses a different programming algorithm
where you are supposed to cycle through the entire memory
a number of times.

The differences between the 2708 EPROM
and the next device in the series:

2708 2716
+----\/----+ ---+
1 |A7 24| VCC | VCC
2 |A6 23| A8 | A8
3 |A5 22| A9 | A9
4 |A4 21| VBB | VPP (-5V on 2708)
5 |A3 20| WE/CS | /OE
6 |A2 19| VDD | A10 (-12V on 2708)
7 |A1 18| VPP | /CE
8 |A0 17| D7 | D7
9 |D0 16| D6 | D6
10 |D1 15| D5 | D5
11 |D2 14| D4 | D4
12 |GND 13| D3 | D3
+----------+ ---+

ASCII pinouts from:
http://www.embeddedlinks.com/chipdir/giicm/2716.txt
http://www.embeddedlinks.com/chipdir/giicm/2708.txt

2708 2716
+--------\/--------+ +--------------+
1 -|a7 vcc|- 24 A7 |1 +--+ 24| VCC
2 -|a6 a8|- 23 A6 |2 23| A8
3 -|a5 a9|- 22 A5 |3 22| A9
4 -|a4 vbb|- 21 A4 |4 21| VPP
5 -|a3 we/cs|- 20 A3 |5 20| /OE
6 -|a2 2708 vdd|- 19 A2 |6 19| A10
7 -|a1 program|- 18 A1 |7 2716 18| /CE
8 -|a0 o7|- 17 A0 |8 17| D7
9 -|o0 o6|- 16 D0 |9 16| D6
10 -|o1 o5|- 15 D1 |10 15| D5
11 -|o2 o4|- 14 D2 |11 14| D4
12 -|gnd o3|- 13 GND |12 13| D3
+------------------+ +--------------+