Sunday, June 14, 2026

Using new hysteresis technique to protect against noisy signals in some of my FPGA designs

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EXTERNAL SIGNALS MAY NOT BE CLEAN ENOUGH FOR CERTAIN LOGIC Every external signal coming into the FPGA has to be passed through a series of f...

Found substitute spring for the Calcomp 565 plotter and verified it works properly

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RESTORING CALCOMP 565 PLOTTER I was given a Calcomp 565 Plotter, one of the first drum plotters, which is the same mechanism as IBM resold u...
Thursday, June 11, 2026

Whipped up a 1053 Emulator log file display and print program

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1053 EMULATOR OUTPUT ON PUTTY SCREEN VERSUS PUTTY LOG FILE The Putty terminal program screen shows the text being output by the 1130 in blac...
Wednesday, June 10, 2026

Implementing and testing the overtyping behavior in the 1052 Emulator - part 3

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METHODOLOGY FOR OVERTYPING Since the Putty terminal program does not combine the characters into a single composite, the original design was...
Tuesday, June 9, 2026

Created an SMS signal socket to connect to a paddle card for the 1052 Emulator

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SMS SIGNAL CONNECTIONS USING PADDLE CARDS IBM had developed standards they used to build computers in the 1950s and early 1960s, starting wi...

Implementing and testing the overtyping behavior in the 1052 Emulator - part 2

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TEST WITH MODIFIED FONT AND STARTUP STRING I reloaded the font with the Putty configuration to be certain it is using the modified version I...
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Monday, June 8, 2026

Implementing and testing the overtyping behavior in the 1052 Emulator - part 1

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OVERTYPING IS A FEATURE OF THE 1052 THAT I WANTED TO EMULATE The 1052 Console Printer is based on the IBM Selectric typewriter and uses inte...