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February 2024

5 participants
2 discussions

9010A Z80 pod and the !IORQ line
by davids＠oz.net 14 Feb '24

14 Feb '24

Z80 pod and the !IORQ line. Working on a GamePlan MPU-2 board. Address space looks like: 0x0000-0x1000 ROM 0x0004 8255 Port A 0x0005 8255 Port B 0x0006 8255 Port C 0x0007 8255 Control 0x0008 Z80 CTC Ch1 0x0009 Z80 CTC Ch2 0x000A Z80 CTC Ch3 0x000B Z80 CTC Ch4 Looking over the schematic I can see that the chip select lines for the 8255 and CTC are tied the Z80 !IORQ pin (20). Makes sense, only interface with the two peripherals when you need too so you can overlap the address space. But from the 9010A how do I control that I am reading / writing to those devices? Thanks, 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 2005-Current: https://seven.pairlist.net/pipermail/techtoolslist/ Vectorlist Archives 1997/99 - 2016: https://www.vectorlist.org/

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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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