From a42ecc2719cfbaa4be70b1b5327bd660238c745e Mon Sep 17 00:00:00 2001
From: Will Jhun <36206676+wjhun@users.noreply.github.com>
Date: Sat, 15 Jul 2023 15:10:57 -0400
Subject: [PATCH] update PgmType for 27C040 EPROM

The (AMD/Atmel) 27C040 EPROM doesn't have a dedicated Write Enable (WE),
instead sharing the same pin for CE# and PGM#. This updates the PromDevice27
line for this device to use the E27C_PGM_CE PgmType.

This configuration has been successfully used to read, program and verify an
AM27C040 device. A +12.75V voltage was applied to Vpp during the duration of
device programming.
---
 TommyPROM/TommyPROM.ino | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/TommyPROM/TommyPROM.ino b/TommyPROM/TommyPROM.ino
index 0c27101..0c63234 100644
--- a/TommyPROM/TommyPROM.ino
+++ b/TommyPROM/TommyPROM.ino
@@ -48,7 +48,7 @@ PromDevice28C  prom(32 * 1024L, 64, 10, true);
 //PromDevice27  prom(8 * 1024L, E27C_PGM_WE, 1000L, 15, 4);  // 2764 with SEEQ intelligent programming
 //PromDevice27  prom(32 * 1024L, E27C_PGM_WE, 1000L, 25, 3); // 27C256 with SEEQ intelligent programming
 //PromDevice27  prom(2 * 1024L, E27C_PGM_WE, 50000L, 1, 0);  // 2716 with single 50ms write
-//PromDevice27  prom(512 * 1024L, E27C_PGM_WE, 100L, 11, 0); // 27C040 with Atmel rapid programming
+//PromDevice27  prom(512 * 1024L, E27C_PGM_CE, 100L, 11, 0); // 27C040 with Atmel rapid programming, CE connected to CE#/PGM#
 //PromDevice27  prom(32 * 1024L, E27C_PGM_CE, 100L, 25, 0);  // W27C257/W27E257 with 100uS program pulse on CE
 //PromDevice27  prom(64 * 1024L, E27C_PGM_CE, 100L, 1, 0, false);  // W27C512 with single 100uS program pulse on CE, no verify
 PromDevice27  prom(256 * 1024L, E27C_PGM_WE, 20L, 1, 0, false); // SST27SF020 with single 20us write, no verify