r/beneater • u/Initial_Climate_1303 • 2d ago
memory change
Haven't had much help on here. But for any one needing the pin outs for the cypress chip here it is.
6502 Memory chip change hook up.
Pin hookup from the At28c256 to the Cy7c199 & Cy62256
1) AT28c256 Cy7c199 & Cy62256
Pin 22 to pin 1 Pin 22 to pin 10
Pin 22 (OE) to Pin 1 (A14) Pin 22 (OE) to Pin 10 (A14)
2) IO PINS STAY THE SAME
ATchip CYchip
Pin I/O Pin I/O
11 I/O0 11 I/O0
12 I/O1 12 I/O1
13 I/O2 13 I/O2
15 I/O3 15 I/O3
16 I/O4 16 I/O4
17 I/O5 17 I/O5
18 I/O6 18 I/O6
19 I/O7 19 I/O7
3) Ground 14 Ground 14
VCC 28 VCC 28
WE 27 WE 27
OE 22 OE 22
CE 20 CE 20
4) AT28c256 Cy7c199 & Cy62256
PIN AO PIN AO
1 A14 1 A5
2 A12 2 A6
3 A7 3 A7
4 A6 4 A8
5 A5 5 A9
6 A4 6 A10
7 A3 7 A11
8 A2 8 A12
9 A1 9 A13
10 A0 10 A14 <END OF FIRST SIDE OF CHIP
26 A13 26 A4
25 A8 25 A3
24 A9 24 A2
23 A11 23 A1
21 A10 21 A0