October 2023 - TechToolsList - listserv.classicarcade.com

Designing a 9010 replacement LED display?
by John Robertson via Techtoolslist 09 Feb '24

09 Feb '24

I was looking at my 9005 and grumbling because the tube is missing, then I pulled out the 9010a service manual and you know, it looks like it would be a pretty easy fix to replace the tube with 32 digit alpha-numeric LEDs of the correct size on a small PCB and all that would be needed is to replace the UDN6118 fluorescent drivers with suitable LED drivers and find a place to grab 5V and ground and then mount the new display to the board... Maybe it would work? Anyone interested in poking at the KiCAD layout? I have no free time, but I know there are folks out there looking for a solution to bad or weak tubes... Here is the page: ftp://ftp.flippers.com/TTL/Test_Equipment/Fluke/9010%20Series/9010_Fixture%… <ftp://ftp.flippers.com/TTL/Test_Equipment/Fluke/9010%20Series/9010_Fixture%…> John :-#)# -- _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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Fluke 9010 ram test for 4 bits? Or any non 8 bit wide memory?
by davids＠oz.net 04 Dec '23

04 Dec '23

Have a suspect bad pallet ram on Missile Command, and I see that it is on the CPU memory map so I should be able to get to it from the fluke. Now it is only 4 bits wide (and only uses 8 addresses) so I can just do it manually but I have seen this on other boards before and never could find a way to use the fluke to test these 4 bit rams. Would also assume it could be a problem for 68000 based boards which use 16bit wide memory. David _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/

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Noise…
by John Robertson via Techtoolslist 09 Oct '23

09 Oct '23

I was trying to sort out a Rottendog System 9TO11 MPU that would work with some EPROMs - sometimes - but not others. So pulled out the 9010 and 6802 pod and did some signatures. Sure enough the signatures were not the same ones twice. Made a simple RAM test for verifying the Data and lower Address lines at the EPROM positions - used a 6265 RAM and tied the /WE line to pin 27 of the CMOS RAM (R/W). And the 9010 RAM tests worked just fine so I was sure the Data lines and lower Address lines (A0-A12) were good. Scope on A13 and A14 were inconclusive. Pulled out my 6802 NOP CPU (hard wired to NOP) and scoped A13 - lots of noise on the bottom half of the cycle! Replaced the 74HCT244 buffer and the board is again a happy camper! I do like my NOPs for checking Address lines! I made them years ago for the common 8-bit CPUs and use them periodically on weird problems that the Fluke 9010 can’t nail down. Just bend the CPU’s Data leads up and tie them as needed to produce the NOP code. John :-#)# _______________________________________________ Techtoolslist mailing list Techtoolslist(a)flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site 2005-Current: https://seven.pairlist.net/pipermail/techtoolslist/ Vectorlist Archives 1997/99 - 2016: https://www.vectorlist.org/

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