Introduction

EPROM cards are becoming useless as they do not offer much storage.

Benny modified a 32K EPROM card to a 512K Flash card.

This is what he did.

Modification to card

Instructions

Pull off the lid

round off the 4 plastic pins

cut some space around the pins

Connect the wires to the chip
and edge connector,
Only use a small amount of solder, leaving
as much of the gold connector as possible.
Make space for the little wires,
not too much as the plastic has
to push the PCB leading wires
around the holes.

Edge	Wire	Chip
31	Green	32
30	Yellow	30
16	Blue	31

2	Black	3
1	White

Flatten the 32 pins and clean up copper.
They go through the pcb too far preventing
the cover to sit tight in it's place.

2 pieces of sellotape were used to keep the
top and bottom of the case tight

one layer up front and one in back

Tape should be tight and flat

Components used

Component	Manufacturer Part No	Order Code	Price	Min Qty
AMIC - A29040C-55F - MEMORY, CMOS, 4MBIT, DIP-32	A29040C-55F	Farnell	2.76	1

Conclusion

Benny has shown that it is relatively easy to build your own 512K Flash card for very little money. The difficult bit is getting the extra wires to connect to the gold connector without contaminating it with solder. Not an easy task.

32K EPROM to 512K Flash Card

Modification to card

Components used

Conclusion