Chandler Posted December 19, 2021 Share Posted December 19, 2021 I have the PDF of the Falcon CPU with pinout of the pins but none are marked as Data or Address How do i find out these 2 lines? Thanks 68030 QFP.pdf Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted December 19, 2021 Share Posted December 19, 2021 Pages 47 and 48 detail the pinout of the chip pins Axx are the address lines pins Dxx are the Data lines Quote Link to comment Share on other sites More sharing options...
Chandler Posted December 19, 2021 Author Share Posted December 19, 2021 OK so there isn't 1 x data line or address line but many data and address lines! Quote Link to comment Share on other sites More sharing options...
larrylaffer Posted December 20, 2021 Share Posted December 20, 2021 Correct. There is an "address bus" and a "data bus". The address bus is the set of Ax and the data bus is the set of Dx as mentioned before. Sent from my SM-N981U1 using Tapatalk Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted December 20, 2021 Share Posted December 20, 2021 I really don't want to be unpleasant, but how about first learning some basic things about CPUs, general about digital circuits, computers, before studying some CPUs data sheet ? 1 Quote Link to comment Share on other sites More sharing options...
Chandler Posted December 20, 2021 Author Share Posted December 20, 2021 I'm just going on what is stated in the Falcon service manual for testing CPU, "check data and address lines to see if they are toggling" it says when test cartridge fitted on initial power up The manual doesn't specify which data and address lines to check so do i assume any of them??!! Quote Link to comment Share on other sites More sharing options...
Tillek Posted December 20, 2021 Share Posted December 20, 2021 16 hours ago, ParanoidLittleMan said: I really don't want to be unpleasant But you're so GOOD at it... Would be a shame to let all that talent go to waste. 1 Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted December 21, 2021 Share Posted December 21, 2021 Tillek, so useful, as usual . Merry Xmas to you, seggfej . Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted December 21, 2021 Share Posted December 21, 2021 20 hours ago, Chandler said: I'm just going on what is stated in the Falcon service manual for testing CPU, "check data and address lines to see if they are toggling" it says when test cartridge fitted on initial power up The manual doesn't specify which data and address lines to check so do i assume any of them??!! That formulation makes not clear are there multiple address lines, and multiple data lines. Or is multiple because 1+1 is multiple number ? Still, it is elementary in case of come computer. It is best to check lower address lines - like A3 and around - highest address lines may toggle in longer time intervals - talking when it works, and CPU is not 'frozen' . Data lines normally all change state in normal work. But with voltmeter you will not see toggling, just average voltage. Frequency is in MHz range. Scope or logic probe is where it is best visible. Quote Link to comment Share on other sites More sharing options...
Chandler Posted December 21, 2021 Author Share Posted December 21, 2021 I have a logic probe. Ok so i will check as you say around A3 area... Thanks for your help Quote Link to comment Share on other sites More sharing options...
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