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9-7-2023: Level Shifters added!

A project log for PicoRAM 2090

A Raspberry Pi Pico (RP2040)-based 2114 SRAM Emulator & Multi-Expansion for the Microtronic Computer System * RetroChallenge 2023/10 *

michael-wesselMichael Wessel • 09/08/2023 at 15:19•0 Comments
Feeling better now - no more > 5 V peak-to-peak levels. On display is address bit A0 and data bit IO/1. Both are now at ~ 3.4 V; the mean is much lower. I was surprised about the 200 Hz frequency... this is probably misleading though and probably caused by the LED display refresh and keyboard scanning activities that are performed over the same TMS1600 GPIO lines. But then, the Microtronic is not the fastet: 500 kHz clock, and after all, it's an emulator that is running in there in the firmware, not native TMS1600 machine code. I believe that SRAM access frequeceny is more in the 1 -2 kHz range.
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Thanks to Hackster for the tweet!

09/09/2023 at 01:14 • 0 comments

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