![]() LOL 8052 with support on a solderless breadboard Have I ever mentioned that I always detested the days of the separate address, data and control buses? Well, if not, I just said it again. ![]() I decided to build up a simple 3 chip design on a solderless breadboard. The 8052 ROM code appeared to be stuck in an continuous loop looking for something in memory. I ran the code through the “MCU 8051 IDE” I had installed under my Linux development system and found that there was no serial output. Perhaps some excess stock for some now obsolete product. Looking through the ROM dump of the 8052, I did not see any strings consisting of the BASIC keywords, so I figured these parts had been used for something else, even though the pins had the typical “new part” pin angle on them indicating that they were never used. Of particular interest was the 8052, which at one time was sporting the INTEL MSC-BASIC interpreter in it’s internal 8K ROM. I was able to read the program MASK ROM in these 80xx parts. Most were DRAM’s but there were a few SRAM’s and some other MCU’s like the 8031, 80. The parts arrived a week later and I scoured through the parts I had received. Looking through the eBay listings for some of these parts, I knew I would spend at least that for just a handful of basic parts Z80, UART, EEPROM, RAM and PLD for address decoding. ![]() I decided to send him the US$20 he was asking for via PAYPAL. He claimed he had at least 100 IC’s in the lot of various IC’s, some of which were Z80 and support peripherals. A few weeks ago, I had met a man online that had some “vintage computer parts” for sale. ![]()
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December 2022
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