int e l +5V 7 2N4403 1 +21V VPP PGM 2 7 1 2 8 A0 OE 10k 10k CE A12 A11 A10 A9 A8 D7 D6 D5 D4 D3 D2 D1 D0 A7 A6 A5 A4 A3 A2 A1 74LS08 USER EXPANSION EPROM S2 CLOSED PERMITS 27128 TO BE AT ADDRESS 8000H.
A13 MUST BE CONNECTED ON 27128 4.7k +5V CE A12 A11 A10 A9 A8 D7 D6 D5 D4 D3 D2 D1 D0 A7 A6 A5 A4 A3 A2 A1 A0 OE +5V 7407 1k 8K x8 STATIC RAM A0 WE OE Overlapping user EPROM address space 7407 CE A12 A11 A10 A9 A8 D7 D6 D5 D4 D3 D2 D1 D0 A7 A6 A5 A4 A3 A2 A1 GND OE Vcc +5V S1 CLOSED PRODUCES OVERLAPPING ADDRESSES 74LS08 74LS08 +5V 4.7k +5V 4.7k S2 S1 6 5 4 3 2 1 0 E3 E2 E1 A2 A1 A0 7 4 L S 1 3 8 +5V P1.5 P1.4 RST P2.7 XTAL1 P2.6 P2.5 P2.4 XTAL2 P2.3 P2.2 P2.1 P2.0 P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 P1.3 ALE SERIAL IN WR RD PSEN SERIAL OUT EA Vcc GND +5V C1 = C2 = 30 pF FOR XTALS 40 pF FOR CERAMIC RESONATORS 10MFD 8.2k C1 C2 1488 1489 - 161 -