Model 100 ROM

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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