8051 Development board

This is a SIMMStick ™ compatible board for 8051 program development

Hardware features

• 40pin DIP for 8031/8051/8751/8052/8752 CPU

• SIMMStick edge connector for power, serial and parallel I/O

• 128k EEPROM

• 64k SRAM

• Soft decoding memory through GAL

• 4 memory decode select jumpers

• parallel I/O to match Dontronics DT104 with Atmel 89C2051 CPU

• uses ex-motherboard chips (cache RAM and BIOS EEPROM)

Software features

• None in particular - suggest you use it to run Paulmon2

Details

• Blank PCB
  • top view
  • bottom view
• Populated board
• Protel PCB file
• GAL program file (uses Lattice Semiconductor ispDesignExpert)

Memory Map

Mode	Jumpers	Data Memory		External Program Memory		Internal Program Memory
		0000-7FFF	8000-FFFF	0000-7FFF	8000-FFFF
15		bank0 EEPROM	32k SRAM	bank0 EEPROM	32k SRAM	ENABLED
14		bank0 EEPROM	32k SRAM	bank0 EEPROM	32k SRAM
13		bank1 EEPROM	32k SRAM	bank1 EEPROM	32k SRAM	ENABLED
12		bank1 EEPROM	32k SRAM	bank1 EEPROM	32k SRAM
11		bank d9 EEPROM	32k SRAM	bank d9 EEPROM	32k SRAM	ENABLED
10		bank d9 EEPROM	32k SRAM	bank d9 EEPROM	32k SRAM
9		32k SRAM	bank0 EEPROM	32k SRAM	bank0 EEPROM	ENABLED
8		32k SRAM	bank0 EEPROM	32k SRAM	bank0 EEPROM
7		32k SRAM	bank1 EEPROM	32k SRAM	bank1 EEPROM	ENABLED
6		32k SRAM	bank1 EEPROM	32k SRAM	bank1 EEPROM
5		32k SRAM	bank d9 EEPROM	32k SRAM	bank d9 EEPROM	ENABLED
4		32k SRAM	bank d9 EEPROM	32k SRAM	bank d9 EEPROM
3		SRAM		SRAM		ENABLED
2		bank0 EEPROM		bank0 EEPROM
1		bank1 EEPROM		bank1 EEPROM
0		bank d9 EEPROM		bank d9 EEPROM

GAL Pinout

                             ._____    _____.
                             |     \__/     |
                          d9 |  1        24 | vcc
                         a15 |  2        23 | clk573
                       _psen |  3        22 | _srwe
                         ale |  4        21 | _sr2cs
                        _res |  5        20 | _sr1cs
                         _rd |  6        19 | _oe
                          s2 |  7        18 | eea16
                          s1 |  8        17 | _eewe
                          s3 |  9        16 | _eecs
                          s0 | 10        15 | rst
                         _wr | 11        14 | _ea
                         gnd | 12        13 | oe
                             |______________|