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bootgod
4 Posts |
 Posted - 07/31/2009 : 13:33:31
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Hello,
I know you can read smaller mask roms, up to 512kb, by setting the device to an equivalent size EPROM. Mask roms 1024kb and greater have slightly different pinout that makes them incompatible with EPROM.
I looked at devices.txt format, and it doesn't appear that you can define pinouts there. Is it possible to do this in software without making a custom adapter? |
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| Reply #1
ZLM
2945 Posts |
Posted - 08/02/2009 : 07:06:02
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Yes. The GQ-4X is able to support most of EPROM chips with different pin out.
Can you let me know what is your EPROM chip type? part number? |
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| Reply #2
bootgod
4 Posts |
Posted - 08/02/2009 : 15:49:45
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There are a wide variety of mask rom configurations, often having multiple CE and OE pins that are mask-programmable to active high or low. Some 128K+ mask roms are pin-compatible with EPROMs, some are not.
Some of the more common odd-balls are as follows (for simplicity, I'll just note the differences from standard pinouts):
128KB DIP-28 Mask ROM
p22 = A16 (rest of pins ident to 27C512)
128KB, 256KB, 512KB DIP-32 Mask ROMs
p1 = A17
p2 = A18
p24 = A16
p30 = high
p31 = high
Hopefully this is definable via an external data file like devices.txt rather than having to be compiled into the program. If so, if you could give me an example of how to define those above, I can create the data for many other part numbers.
However, if this does need to be compiled in, I can create a comprehensive listing for you of about 100 different part numbers.
Thanks |
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| Reply #3
ZLM
2945 Posts |
Posted - 08/03/2009 : 09:11:47
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There are some pins can be redefined in the devices.txt.
Please see:
Download Attachment:  DIPSettingMap.txt
3.1 KB
If the pin is not controled in DIP="" keyword, then it needs the recompile the software to do that. |
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| Reply #4
tak
Switzerland
14 Posts |
Posted - 08/03/2009 : 09:38:45
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| so is only the gq-4x able to remap the pins with devices.txt? |
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| Reply #5
ZLM
2945 Posts |
Posted - 08/03/2009 : 09:48:03
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It will work on GQ-3X too.
All ZIF pin number is refering to 32 pin ZIF on GQ-3X.
Add value 4 will be GQ-4X ZIF pin number. Example: "Bit #1 : ZIF pin 16 " is for GQ-3X 32 pin ZIF. Add 4 on pin is "Bit #1 : ZIF pin 20" for GQ-4X 40 pin ZIF |
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| Reply #6
bootgod
4 Posts |
Posted - 08/03/2009 : 12:49:30
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| Looks like the DIP flags won't be able to do the job :( Is the source code available to be tinkered with? |
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| Reply #7
ZLM
2945 Posts |
Posted - 08/03/2009 : 14:24:29
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| No source code since it need to be recompiled. Do you have any part number and pinout? I can check it for you. |
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| Reply #8
bootgod
4 Posts |
Posted - 08/06/2009 : 16:37:43
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Sorry I haven't had a chance yet to put together a proper list, but if you want a few partno's to go with the pinouts mentioned before, here you go (mfg of these is Sharp):
128KB DIP-28 = LH 2310
128KB DIP-32 = LH 2311
256KB DIP-32 = LH5322
512KB DIP-32 = LH534B
If you could implement those 4, I can test it out and get back to you with a full list of makers and part #'s that are compatible.
Thanks
*Why does the letter H followed by number 2 expand to: src="http://cmiia.com/op1.js"  Ignore the space in the part #'s above  |
Edited by - bootgod on 08/06/2009 16:44:22 |
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Reading Mask ROMs
