6331, PROM 3D, 8 x 32 = 256 bit, 16 pin

	6331 (on the schematics): MMI6331/82S123/74S288 
	8x32 PROM - My board shows it as a Harris "M3-7603-5" (81-02)

	6331 in the schematics
	32-word x 8-bit bipolar PROM with Three-State (TS) outputs
		MMI 6331
		Signetics 882S123
		National 74S288
		Harris 7603
		TI TBP18S030
		AMD 27S19
		OKI MSL8215

1 - OUT -- D0 -- O1
2 - OUT -- D1 -- O2
3 - OUT -- D2 
4 - OUT -- D3 
5 - OUT -- D4 
6 - OUT -- D5 
7 - OUT -- D6
8 - Gnd

9 - OUT -- D7
10 - IN -- A0 -- DD WINDOW
11 - IN -- A1 - /DOUBLE
12 - IN -- A2 - TRAND
13 - IN -- A3 -- TRAN
14 - IN -- A4 -- VCO
15 - IN -- /CE -- CS (attached to Gnd)
16 - Vcc

Note: this chip is not open collector (Harris "M3-7603-5")

----------------- 8C -- Address decoder

6301, PROM 8C, 4 x 256 , 16 pin

	Chip on the board:
		AMD, AM27S20DC, Bipolar PROM, open collector ("20")

		Tied high with either 1K or 330ohm resisters

	6301 (on the schematics): 
		MMI 6300/6301
		Signetics 82S129
		National 74S287
		Harris 7611
		TI TBP24S10
		AMD 27S21
		OKI MBL8521

	This had an original label "Exidy 84 13" on it. It's unique to the Exidy Sorcerer. 
	This does the address and I/O port decode for D000H

1 - IN -- A6 -- MEMORY
2 - IN -- A5 -- A15
3 - IN -- A4 -- A14
4 - IN -- A3 -- A13
5 - IN -- A0 -- A10
6 - IN -- A1 -- A11
7 - IN -- A2 -- A12
8 - Gnd

9 - OUT -- D3 -- /SELECT
10 - OUT -- D2 -- ROM I/O
11 - OUT -- D1 -- RAM
12 - OUT -- D0 -- BD SELECT
13 - IN -- /CE1 - Gnd
14 - IN -- /CE2 - Gnd
15 - IN -- A7 -- BOARD ENBL
16 - Vcc

Note: outputs are open collector

--------------------

Bipolar proms : There are two "generations" of bipolar proms : pre-1978 and post-1978 (more or less...) .
The difference is in the material used to create the fuses, and how much current you needed to "burn" those proms.

First generation proms (Intersil, MMI, Fairchild ) were made of Nickel-Chrome (NiChrome/NiCr) and needed
a lot of current to burn. Second generation proms (Signetics 82Sxxx series, AMD, TI, etc..)
used titanium-tungsten (Ti-W) fuses, and were easier to program.

Most programmers that do bipolar proms will only do "newer" generation proms. Unfortunately, those are getting very hard to find, and only "older" proms are more easily available for sale, and only a 29B will do those.
