Taken some readings (not repeated so maybe not pin for pin correct) EZ-bus post-POST situation Logical Analyser LA160 not used yet pin /function * DVM "volts DC" (steady av voltage of pulse train ) * scope trace
1 DISCON#
* 3.3
2 VCC * 3.3
3 GND
* 0
4 CLK24 * 1.6
* 23.997MHz
5 GND * 0
6 GND
* 0
7 A0 * 1.5
* high speed data
8 A1 * 1.5
* high speed data
9 A2 * 1.5
* high speed data
10 A3 * 1.4
* high speed data
11 A4 * 1.7
* high speed data
12 A5 * 1.5
* high speed data
13 GND * 0
14 GND
* 0
15 A6 * 1.4
* 40uS word length data
16 A7 * 1.2
* 40uS word length data
17 GND * 0
18 AGND
* 0
19 XIN * 1.4
20 XOUT
* 1.4
21 AVCC * 3.3
22 VCC
* 3.3
23 GND * 0
24 EA
* 0
25 RESET * 0
26 A8
* 2.3
27 A9 * 0.7
28 A10
* 1
29 A11 * .5
30 PC0/RxD0 * 5
31 PC1/TxD0 * 3.3
32 PC2/INT0# * .08
33 PC3/INT1#
* 5
34 A12 * 1.2
* 40uS word length data
35 A13 * .5
* 40uS word length data
36 A14 * .5
* 40uS word length data
37 A15 * .6 * 40uS word length data
38 PC4/T0 * 0
39 PC5/T1 * 3.3
40 PC6/WR# * 3.2
41 PB7/T2out
*3,3
42 VCC * 3.3
43 GND * 0
44 PB0/T2 * 0
45 PB1/T2EX * 0
46 PB2/RxD1 * 5
47 PB3/TxD1
* 3.3
48 D0 * .6
* 40uS word length data, 3 level
49 D1 * .7
* 40uS word length data, 3 level
50 D2 * .5
* 40uS word length data, 3 level
51 D3 * .5 * 40uS word length data, 3 level
52 PB4/INT4 * 5
53 PB5/INT5# * 5
54 PB6/INT6 * .07
55 PC7/RD#
* .07
56 GND * 0
57 D4
* 1.8 * 40uS word length data, 3 level
58 D5
* .4 * 40uS word length data, 3 level
59 D6
* .9 * 40uS word length data, 3 level
60 D7
* 1.8 * 40uS word length data, 3 level
61 BKPT
* 0
62 VCC * 3.3
63 GND
* 0
64 SDA * 3.3
65 SCL
* 3.3
66 WAKEUP# * 3.3
67 NC * 0
68 PA0/T0out * 3.3
69 PA1/T1out * 0
70 PA2/OE# * 0
71 PA3/CS#
* 2.9
72 GND * 0
73 PA4/FWR# * 3.3
74 PA5/FRD# * 3.3
75 PA6/RXD0out * 5
76 PA7/RXD1out
* 0
77 USBD- * .04
78 GND
* 0
79 USBD+ * 3.3
80 PSEN#
* 2.9 * 40uS word length data
24LC128 EEPROM voltages
1, A0, always H
2, A1 ,always L
3, A3 ,always L
4, Vss, 0V
5, SDA, data burst at switch on , about 2sec gap, then burst post POST
6, SCL, clock bursts as p5
7,WP , L
8 , Vcc, 3.3V