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Details of the NCD ExploraPro X-terminal hardware and embedded software.
Connectors
- J1 - AC Power Connector
- J2 - PS/2 Keyboard
- J3 - PS/2 Mouse
- J4 - 15-pin HD VGA
- J5 - Type 2 PCMCIA
- J6 - 25-pin Parallel port
- J7 - 9-pin RS232C (IBM-AT style) Serial port
- J8 - RJ45 10BaseT Ethernet
- J9 - 72-pin SIMM
- J10 - 72-pin SIMM
- J11 - BNC 10Base2 Ethernet
Parts on NCD ExploraPro X-terminal
- U1 - LM2576S -5.0V switching regulator
- U2 - LM336
- U3-6 - NEC424210-60-6 VRAM
- U7 - Lucent PrecisionDAC 20C409-13
- U8 - HCT374A
- U9 - ACT04 (hex invertor)
- U10-11 - GALs
- U12 - S3 86C868 (SVGA controller)
- U13 - 2061ASC-1
- U14-15 - GALs
- U16 - HCT374A
- U17 - F139 (dual demultiplexor)
- U18 - NS PC87303 SuperI/O (local 1.1M pdf)
- U19 - SLI74CTF0A-3 (probably some sort of ISA bridge)
- U20-21 - HCT374A
- U22 - NS DS14C241 RS232C level convertor
- U23 - S74FCT257
- U24 - IBM PowerPC 403GA (local 653k pdf)
- U25 -
- U26 - S74FCT257
- U27-28 -
- U29-32 - SEC KM48C2100AJ-6 (16MBit DRAM)
- U33 - xx618 (3 terminal regulator??)
- U34 - S74FCT257
- U35 - Am79C965 PCnet-32 Single-Chip 3-Bit Ethernet Controller (1.2M pdf)
- U36 - 35104S (probably the Ethernet address serial ROM)
- U37 - AM27C020-200DC (256k x 8 UVEPROM)
- U38 - S74FCT257
- U39 - Philips NE8392CA (10Base2 Ethernet interface)
Hardware Details
Serial Port
The RS232C Serial port is implemented with:
- connector J7,
- U22, the RS232 level convertor
- U18, the SuperI/O controller (serial port 1)
Connections are:
- SIN1 (Serial IN 1) on U18/122 - U22/?
Configuration Details
Register Dump
From the ROM monitor "dr" command, it is possible to determine some details of the memory map of the X-terminal. Bank Register values are:
- BR0 - 0xFF180772: EPROM @ 0xfff00000, 1MB, r/w, 8-bit
- BR1 - 0x2099428e: VRAM @ 0xf2000000, 16MB, r/w, 32-bit
- BR2 - 0x3098cab2: @ 0xf3000000, 16MB, r/w, 16-bit
- BR3 - 0x409843f4: @ 0xf4000000, 16MB, r/w, 8-bit
- BR4 - 0x00000000:
- BR5 - 0x00000000: SIMM 2 DRAM (when present)
- BR6 - 0x18590ab0: SIMM 1 DRAM @ 0x01800000, 4MB, r/w, 32-bit
- BR7 - 0x10794ab0: On-board DRAM @ 0x01000000, 8MB, r/w, 32-bit
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