Model 100 ROM

The Model 100 has different hardware versions. One of the main differences is the ROM chip. Older units generally have the LH35618 chip and new the 3256C01, which is a 27256 compatible chip.

Steve Adolph has a document on this in his personal files at Club100

The chip pinout are:

Pin#	LH535618	3256C07
1	VDD		VPP
2	A10		A12
3	A7		A7
4	A6		A6
5	A5		A5
6	A4		A4
7	A3		A3
8	A2		A2
9	A1		A1
10	A0		A0
11	D0		D0
12	D1		D1
13	D2		D2
14	GND		GND
15	D3		D3
16	D4		D4
17	D5		D5
18	D6		D6
19	D7		D7
20	A11		/CE
21	/OE		A10
22	A13		/OE
23	/CE		A11
24	A12		A9
25	A9		A8
26	A8		A13
27	/CS		A14
28	A14		VCC