Add a classic microprocessor to your Arduino MegaDesigned by 8-Bit-Force in United States of America
READ FIRST: UART on this RetroShield is slightly slower compared to other processors. Most monitor code uses the 8031 internal UART hardware, which means Arduino has to implement a soft-uart to sen...Read More…
READ FIRST: UART on this RetroShield is slightly slower compared to other processors.
Most monitor code uses the 8031 internal UART hardware, which means Arduino has to implement a soft-uart to send/receive characters thru 8031's TxD/RxD pins. Current UART speed is 300 cpu cycles/baud, meaning each character will take 2400 clock cycles to be transferred. Compare this to using a 8251 UART chip which will deliver the UART in a few clock cycles. If you want to write your own monitor program, consider using a 8251 for faster UART.
You can run the following:
Or design your own hw platform in Arduino.
Sorry no PCB's. 8031 is running below min clock freq specified in datasheet and I need to send you screened microprocessors.
NOTE: ARDUINO PICTURE SHOWS 6502, BUT YOU WILL GET RETROSHIELD 8031.
First, I have been building SBC's with old microprocessors since high school. For every SBC, I had to spend time wire-wrapping the ROM, RAM, peripheral chips over and over again. Then it was more hassle to expand the SBC. I am now lazy; Arduino Mega is capable enough so I now do my wire-wrapping in software :)
Second, I wanted to give back to the retro community. So all hardware and software design files are open source.
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