The aim of this project is to recall the good old days when electronics were still being used at school.

*MCS-BASIC-52 V1.31*
READY
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• AT89S52 microcontroller with ROM V1.31 ;

• 8 KiB EPROM for BASIC I²C functions ;

• 32KiB RAM ;

• 8 KiB EEPROM for backup ;

• Integrated PIA 8255 ;

• SCALP-compatible expansion connector;

• IDE connector for hard disk;

• Address decoding with a GAL22V10;

• USB serial interface with FTDI232 module.

• The GAL JED file is generated using the utility GALasm under linux.

• the programmer used is a XGECU - pro

• It is capable of programming AT89S52, E(E)PROMs, and Lattice GAL22V10.

Two possibilities for this project :

• 80C32 processor and external EPROM 27128 (BASIC and I2C functions) (/EA=0) (tested)
• AT89S52 processor with programmed Basic monitor and external EPROM 2764 (I2C functions) (/EA=1) (tested)

The card works without eprom and gal just with the ram. to do this, connect two wires to the dip 24 GAL connector. (only with AT89S52)

• A15 to /CSRAM (1 to 20)
• /RD to /OE (16 to 18)

• 1st test after reset and space bar to wake-up board

• LED test (add a cable to connector J1 between terminal 14 and 2)
• Led must be active in low level on PORT1 !!!

• Blink test and eeprom programming, run auto after reset

• Pia 8255 : test and copy eeprom program into the ram

• Elektormagazine Elektormagazine

• Dos4ever dos4ever

• Paulmon2 Paulmon2

• Ide ide

• Idescalp Idescalp