krischik in #hive-175254 • 4 months agoBen Eater 6502 Kit — Day 22The interrupt requests are meant to be shared between several advanced devices. The breadboard 65C02 computer has only…krischik in #hive-175254 • 4 months agoBen Eater 6502 Kit — Day 21The 65C02 has two interrupt lines: NMI (mon maskable interrupt) and IRQ (interrupt request). It should be noted that…krischik in #hive-175254 • 4 months agoBen Eater 6502 Kit — Day 20The ordered spare parts have arrive and not a minute too late. The poor EEPROM looks pretty beaten: One leg broken off at the casekrischik in #hive-175254 • 4 months agoBen Eater 6502 Kit — Day 19Up until now the computer was run either by a fairly slow 555 timer or even slower single stepping. This was possible…krischik in #hive-175254 • 4 months agoBen Eater 6502 Kit — Day 18As the programs become more complex debugging becomes more difficult at well. All you have are hex codes which you…krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 17Now we have some RAM we have stack and can use subroutines to make the program more compact. I already used macros and…krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 16Ben Eater used a single SN74H00N 4×2 NAND chip as memory management unit which decoded 3 address lines (A13 ……krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 15The first version of the Hello World program in bare metal 65C02 assembler was 342 bytes long. That's quite a lot for…krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 14The computer is coming along nicely. Next a Display is added to the system. Adding power  pin was bent inwards. To bad I didn't make a photo to…krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 8It seems that the broken power supply has also destroyed the CPU itself. That's very bad and I have to order new one.…krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 7One of the advantages of the WDC60C02 is the fully static design. This makes it possible to stop the CPU clock at any…krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 6Sadly on day six I didn't get much done as the power supply died on me. And since I don't have another 5V, 2A power…krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 5Day 5 and we are still building a clock. But today I finished the clock module. It was fun subproject. Tomorrow I…krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 4We have two clocks, now we need a way to switch between the two. Switches are not as often debounced as buttons but in…krischik in #hive-175254 • 5 months agoBen Eater 6502 Kit — Day 3On day three we add a function to slow down the futures computer to one step per button click. On first glance this…
