I am reverse engineering ASDER 20 in 1 multicart.
While the 4 Mbit PRG memory has pinout the same like 27c040, 2Mbit CHR has quite weird pinout. Do you know name of any eprom chip with same pinout?
Blob-top memory unknown pinout
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- krzysiobal
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Re: Blob-top memory unknown pinout
It's not too different from the 40-pin 16-bit data bus UVEPROMs. (e.g. look at 27C4100 and 27C4096) By which I mean "address bus mostly in order" and "data bus in order if you skip the high byte".
But I don't know of an exact match.
But I don't know of an exact match.
Re: Blob-top memory unknown pinout
I was digging around some more and found this random pinout reference of a bunch of ROMs used on a bunch of random arcade boards. Most of them are similar to the JEDEC standard pinout, but this is conspicuously different:
I find it amusing that this is clearly a 16-bit ROM where they've just chosen to not wire bond D8-D14, and wire bonded /BYTE to ground internally.
Code: Select all
(4M) 512k x 8 mask rom
HN62304
A8 1 +-v-+ 32 A9
A7 2 | | 31 A10
A6 3 | | 30 A11
A5 4 | | 29 A12
A4 5 | | 28 A13
A3 6 | | 27 A14
A2 7 | | 26 A15
A1 8 | | 25 A16
oe? 9 | | 24 A17
gnd 10 | | 23 A18
ce? 11 | | 22 gnd
D0 12 | | 21 A0
D1 13 | | 20 D7
D2 14 | | 19 D6
D3 15 | | 18 D5
+5v 16 +---+ 17 D4
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Re: Blob-top memory unknown pinout
krzysiobal: Could you please check whether game number 14 (Benico) has graphical errors during the attract mode that plays after waiting at that individual game's title screen for a few seconds?
- krzysiobal
- Posts: 1037
- Joined: Sun Jun 12, 2011 12:06 pm
- Location: Poland
- Contact:
Re: Blob-top memory unknown pinout
Yes, it has.
Here is my fix:
Here is my fix:
- Attachments
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- ASDER 20-in-1 (Unl)[U][!] [Benico fix].ips
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