alejack12001
Experienced Member
The BIOS chip for the ODD is dated 1987 Version 1.2 JL27C128D/029031, made in Singapore in 2009 while the EVEN is L27C128D/047010, made in Japan 2013. Of course, I was trying to match the 27C128 since the JL and L series didn't seem to exist. If the power required for the D27128 is 21 Volts the power adapter for the GQ-4x4 is way under powered at 9-10 Volts. According to MCUMall's website (URL: https://www.mcumall.com/store/index.php?route=product/product&path=69&product_id=205), the URL shows this power supply for the GQ.
Chuck(G) thank you for the suggestion. The Landmark Supersoft diagnostic for ODD and EVEN are 16-KB each. So assuming the 256 is programmable from the GQ-4x4, the offset address is 0x000000 where would the second entry address reside since the 256 would be programed twice?
sqpat: I did see AM27128A-2DC on eBay and I have ordered those since the Intel requires high voltage.
Malc: Where did you get your Data I/O programmers guide for old chips?
Chuck(G) thank you for the suggestion. The Landmark Supersoft diagnostic for ODD and EVEN are 16-KB each. So assuming the 256 is programmable from the GQ-4x4, the offset address is 0x000000 where would the second entry address reside since the 256 would be programed twice?
sqpat: I did see AM27128A-2DC on eBay and I have ordered those since the Intel requires high voltage.
Malc: Where did you get your Data I/O programmers guide for old chips?