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From: cmm@chinet.UUCP (Cary Mednick)
Newsgroups: net.micro,net.micro.6809,net.micro.apple
Subject: Re: Reading mask ROMs on ROM burner?
Message-ID: <687@chinet.UUCP>
Date: Sun, 26-Oct-86 21:20:21 EST
Article-I.D.: chinet.687
Posted: Sun Oct 26 21:20:21 1986
Date-Received: Mon, 27-Oct-86 20:44:52 EST
References: <1183@ihwpt.UUCP>
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Reply-To: cmm@chinet.UUCP (Cary Mednick)
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In article <1183@ihwpt.UUCP> knudsen@ihwpt.UUCP (mike knudsen) writes:
>Does anyone have any hints for reading mask-programmed
>(not EPROM) ROMs on a professional ROM burner?
>...etc

There are two common problems that may occur. The first you have dealt
with by determining how the chip selects on the masked roms are programmed.
The second problem is that many masked roms are dynamic devices. That means
that the Chip Select line must toggle for the rom to function properly. The
best way that I have found to read a masked rom is through a target system
with an emulator. Store the file on disk and then send it to the Data I/O
programmer. I have an old Z80 board with a highly configurable Memory site
on it. I set up the chip selects and read away. Be sure that the hardware
toggles the Chip Enable, as many designs do not.
 
Please excuse me if the format of this is awkard, as this is my first response.

Cary Mednick    ...ihnp4!chinet!cmm