Friday, July 31, 2026

Testing my new seek logic for the Virtual 2315 Cartridge Facility - part 6

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NEW APPROACH FOR SHADOWING SEEK IN REAL MODE I made changes to the logic for the FPGA in the Virtual 2315 Cartridge Facility (V2315CF) to ha...
Thursday, July 30, 2026

Testing my new seek logic for the Virtual 2315 Cartridge Facility - part 5

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BETTER LOGIC ANALYZER RECORDINGS AND THEIR RESULTS I recorded several seek movements - 1, 2, 3 and 193 cylinder movements. What I observed i...
Wednesday, July 29, 2026

Testing my new seek logic for the Virtual 2315 Cartridge Facility - part 4

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UPDATES MADE TO LOGIC OF THE V2315CF I made a few updates to the C code for the PICO and the Verilog for the FPGA of the Virtual 2315 Cartri...
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Tuesday, July 28, 2026

Changing the terminator to improve impedance matching for the Virtual 2315 Cartridge Facility

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IMPEDANCE FOR SIGNALS IS COMPLICATED IBM engineers the 1130 for 92 ohm impedance on cables, although in practice there are ribbon cables, tr...

Adjusting my Virtual 2315 Cartridge Facility design to increase signal integrity between 1130 and disk drive

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LOGICALLY THE V2315CF SITS BETWEEN THE DISK AND THE 1130 COMPUTER The cable that ran from the disk controller logic cards in gate A compartm...
Monday, July 27, 2026

Testing my new seek logic for the Virtual 2315 Cartridge Facility - part 3

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MORE OBSERVATIONS OF SIGNAL FOR A SEEK WITH AN ODD COUNT I used my hand programmed code to make several seeks of different lengths in order ...

Testing my new seek logic for the Virtual 2315 Cartridge Facility - part 2

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HAND CODED SEEK PROGRAM EMPLOYED TO CHECK BEHAVIOR I had whipped up a short program that I toggled into core which would walk through a list...
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