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A collection of    EW-904B and EW904BN oriented diagrams, add-ons and modifications

Links to reverse engineered EW904B and EW904BN drawings
Lots of add-on information

Drawings are in PDF format.  Preferably copy to HD first

Reverse engineered and NOT available anywhere else,
but now for download available over here:

Sunshine EW904B schematic pdf file - part 1 of 4 Sunshine EW904B schematic pdf file - part 2 of 4 Sunshine EW904B schematic pdf file - part 3 of 4 Sunshine EW904B schematic pdf file - part 4 of 4 Sunshine EW904B schematic pdf file - 1000H error - A13 modification Sunshine EW904BN schematic pdf file - part 1 of 4 Sunshine EW904BN schematic pdf file - part 2 of 4 Sunshine EW904BN schematic pdf file - part 3 of 4 Sunshine EW904BN schematic pdf file - part 4 of 4

At Robert Madsen's place - More Sunshine info from me:

Sunshine EW904 eprom programmer update and research info, info (c) WG

Sunshine EW904B A13 and more modification info, info (c) WG


The above links are no longer available and switched off.

	Some of my Sunshine research information presented at Roberts place above, over here in smaller chunks This is all very old historic archive information.
	General intro story - introduction to Robert
	I/O port address change from 390H to 290H for EW904B
	Vpp generation design flaw and improvements Open parallel the pictures page further down.
	The cause and solution to the 1000H errors in the EW904B
	The rebuild manual of the circuit around pin26 to solve the A13 problem Solve the 1000H errors in the EW904B
	EW904BN related problems and corrections
	I/O timing dependancies and the cause of errors in faster PC's Investigation and research
	Lots of images about EW904B improvements - A13 and I/O 290H
	Some variation of software, to be done ???
	Lots of scope timing images about Vpp generation and A13 changes.

Now some add-on hardware, diagrams and photos

A bankswitch adapter for the 27C1000/1001, 27C2000/2001
For standard JEDEC and ROM type versions

Circuit diagram in PDF CAD-Layout in PDF part-1 CAD-Layout in PDF part-2 A nice adapter photograph - top view A nice adapter photograph - bottom view A set of Gal design files in ZIP format The zip file over here is for both type of adapters - 27C1000 / 27C4000

A bankswitch adapter only for 27C4000 eproms

Circuit diagram in PDF CAD-Layout in PDF part-1 CAD-Layout in PDF part-2 A nice adapter photograph - top view Also download the GAL ZIP file above

Many TTL-PROM read-out adapters for an Eprom socket
Suitable for many, many types of TTL-PROMs
Designed for reverse engineering purposes

First version PROMS circuit diagram in PDF Updated 2nd version PROMS circuit diagram in PDF Special version adapter for the Philips MX294 PROMS in PDF Add-on circuit for the first version read-out adapters in PDF (In this add-on: more security circuits added, Vcc ON-led, databus protection, forced pull-up or down for don't care bits) A very complete PROM reference guide in PDF, over 40 different PROM (and about 10 TTL RAM) footprint types in 2 varieties from over 15 manufacturers. Now over 50 pages! Hacked from the net, copied, extended and edited by me to give it a decent booklet shape: The TTL PROM list, now V5 ! the print version

And here a nice adapter photograph - top view

A 2708 read-only / read-out adapter
Again designed for reverse engineering purposes
The contents of some 2708 devices were put in banks in a 2732 EPROM

Circuit diagram in PDF Scanned old CAD layout A nice adapter photograph

A cheap PLCC-adapter to program PLCC EPROMS

I made use of (cheap) STANDARD PLCC sockets, NO ZIF version!!!! For occasional use OK, removal with a special extraction tool. (a.o. from Conrad / Germany: order code is 14 94 70 PLCC Tool Price indication about 10 U.S. dollar or Euro) I made 2 versions: one for 2764 / 27128 / 27256 / 27512 eproms. and one for 27C010 / 27C020 / 27C040 eprom versions A set of CAD layout files in PDF How to assemble the sandwich construction - photograph And there it sits on top of the ZIF socket - photograph

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Copyright© 2001 - 2010 Walter Geeraert - All Rights Reserved