6
Memory - Installing DRAM (SIMMs)
You can install anywhere from 4 MB to 64 MB of on-board DRAM memory using 4, 8, 16, 32 or 64 MB 72-
pin SIMMs (Single In-Line Memory Modules). DRAM access time £ 60ns.
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NOTE: The modules can only fit into a socket one way and their gold or silver pins must point down
into the SIMM socket. Make sure you are adequately grounded to avoid memory and PPC-E5
damage.
The procedure for installing SIMMs appears below. Please follow these steps carefully.
1. Ensure that all power supplies to the system are switched Off.
2. Install the SIMM stick. Install the SIMM so that its gold pins point down into the SIMM socket.
3. Slip the SIMM into the socket at a 45-degree angle and carefully fit the bottom of the card against the
connectors.
4. Gently push the SIMM into a perpendicular position until the clips on the ends of the SIMM sockets
snap into place.
5. Check to ensure that the SIMM is correctly seated and all connector contacts touch. The SIMM should
not move around in its socket.
Ethernet
The SMC 91C96 10 BaseT full duplex Ethernet chip uses a standard RJ-45 connector. It can be
connected straight to a hub, or another computer via a crossover Ethernet cable. JP4 is used to set the
Ethernet I/O address and IRQ. The default settings for this jumper block are jumpers in place at positions
A and B. This configuration sets the I/O address at 320H and IRQ 9. Link and Activity (Rx/Tx) LEDs are
provided to monitor network activity.
Serial Ports
The PPC-E5 is equipped with four serial ports, two which are used for on-board functionality, and two
which are available to the user. COM1 and COM2 are used on-board for the SLCC and the touchscreen
controller respectively. COM1 is initialized to 9600 and COM2 is initialized 2400 baud. Both COM1 and
COM2 use 1 start, 1 stop, 8 data bits, and no parity. The user should refrain from reconfiguring these
ports as it may disable the touchscreen and SLCC functionality. The default I/O address and IRQ for
COM1 is 3F8H using IRQ 4. The default I/O address and IRQ for COM2 is 2F8H using IRQ 3.
COM3 and COM4 are available to the user on connectors CN10 and CN11 respectively. These are
standard X86, 16550, 16 byte FIFO UARTS. The default I/O address and IRQ for COM3 is 3E8H using
IRQ 5. The default I/O address and IRQ for COM4 is 2E8H using IRQ 11.
COM3 and COM4 are both by default configured as RS232 ports. COM3 can be optionally factory
configured to an RS422/485 port.
