Introduction

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

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

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
Wires
Glue

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 Connector	Wire	Chip	Signal
37	Green	1	A18
36	Yellow	30	A17
22	Blue	31	WE#
hole under pin 30	Blank	32	VCC
2	Black	3	A15
1	White	2	A16
		16	0v

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 to start with

one layer up front and one in back,
Tape should be tight and flat

Unfortunately, the tape loosened, causing bad contacts.

Solution

Glue the assembly with a small drop of polyurethane on

the 4 plastic points (original holding points)
the 2 sides that slip around the PCB connector
of the Z88 slot with fast glue. Then
let it dry under some weight for several hours.

The card worked super after that.

Here is the flash card being used for files.

The AMD chip was used rather than the AMIC one.

They both have the same pinouts.
Flashstore displays the type used.

Conclusion

Benny Boogaert 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

Components used

Modification to card

Conclusion