Digital Games 574 (Knockout) Need Help Identifying Old Motorola TTL IC
I've been working on a Digital Games 574 (Knock Out) discrete logic PCB.
https://www.arcade-museum.com/game_detail.php?game_id=12731
There are no schematics or info available and I wanted to document the chips and locations first before doing any more work on the board. I replaced a missing crystal yesterday and got it working but the image wigs out occasionally as seen at the end of the video below.
https://youtu.be/DEX0vcXOCzQ
There are a number of chips on the board with 1974 date codes and it adds some confusion when trying to identify some of the ICs.
I've been able to positively identify all but one, it's a Xerox chip number made by Motorola with the following info on the top and nothing stamped on the underside.
M 733W00024
7410
In the image above the are two 7410s with the date code 7410 above and below the chip in question, when I put the Motorola IC in my IC tester it reads as either 7413/7420/7422/7440. When I put the 7410's in there they read as 7410.
I've had a look through the Motorola TTL databook from 1971 and could find no reference to the part number on top but maybe I'm missing something or it's not a part number.
https://ia800807.us.archive.org/25/...otorola_TTL_Integrated_Circuits_Data_Book.pdf
Any ideas?
P.S. Does anyone happen to have a schematic/manual or other info on these boards.
I have a copy of the 474 manual which was helpful in identifying the crystal frequency 5 MHz but if someone has one of these boards and could confirm that is correct, it would be much appreciated..
I've been working on a Digital Games 574 (Knock Out) discrete logic PCB.
https://www.arcade-museum.com/game_detail.php?game_id=12731
There are no schematics or info available and I wanted to document the chips and locations first before doing any more work on the board. I replaced a missing crystal yesterday and got it working but the image wigs out occasionally as seen at the end of the video below.
https://youtu.be/DEX0vcXOCzQ
There are a number of chips on the board with 1974 date codes and it adds some confusion when trying to identify some of the ICs.
I've been able to positively identify all but one, it's a Xerox chip number made by Motorola with the following info on the top and nothing stamped on the underside.
M 733W00024
7410
In the image above the are two 7410s with the date code 7410 above and below the chip in question, when I put the Motorola IC in my IC tester it reads as either 7413/7420/7422/7440. When I put the 7410's in there they read as 7410.
I've had a look through the Motorola TTL databook from 1971 and could find no reference to the part number on top but maybe I'm missing something or it's not a part number.
https://ia800807.us.archive.org/25/...otorola_TTL_Integrated_Circuits_Data_Book.pdf
Any ideas?
P.S. Does anyone happen to have a schematic/manual or other info on these boards.
I have a copy of the 474 manual which was helpful in identifying the crystal frequency 5 MHz but if someone has one of these boards and could confirm that is correct, it would be much appreciated..
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