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Marek Karcz
71 followers -
computer programmer, electronics hobbyist/tinkerer, retro computing/8-bit enthusiast, commodore 64 user/programmer, arduino, raspberry pi
computer programmer, electronics hobbyist/tinkerer, retro computing/8-bit enthusiast, commodore 64 user/programmer, arduino, raspberry pi

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Update on MKHBC-8-Rx : NV RAM access added to DS1685 driver.
DS1685 chip has non-volatile (battery sustained) RAM in two banks. Total of 242 bytes are available for user to store data or code that will be persistent between system power cycles (assuming external 3V battery is used). I have plans regarding this memory...

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MKHBC-8-Rx : Finished building the RTC / Banked RAM card.
Ufff! Took me 2 weeks, but finally finished my combined RTC and banked RAM card. As usual I used prototyping PCB and point to point soldering using enameled magnet wire. I used this part of project as opportunity to enhance my workbench with better solderin...

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MKHBC-8-Rx, RTC / Banked RAM PCB.
Finally! I started to work on RTC / Banked RAM PCB. I use the same technique as before - point to point soldering on a prototype PCB. I have been thinking of perhaps doing the first ever PCB project in software (e.g.: Express PCB) and having my PCB done in ...

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New religion of Global Warming exposed by a scientist for what it is.
https://youtu.be/SXxHfb66ZgM

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Dueling Banjos : retro-computers edition.

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Restored few old laptops. They were in very good shape in the first place, so not a lot of work went to them.
1) Acer 950X, manufactured in 1996, running Windows 95. CMOS battery integrated with motherboard dead - replaced with CR2032 (slightly modded to achieve this). Pentium 120 MHz, 40 MB RAM, 800 MB HDD, 3.5" floppy, all in working order.
2) Dell Latitude Cpt C-Series (C400GT) model PPX, Graphics Controller - NeoMagic 2360, CPU - Celeron 400 MHz, 256 MB RAM, 10 GB HDD, CD-ROM running Windows 2000 Pro. Manufactured in year 2001. Replaced the battery (old one was dead, cost $16), missing key (used keyboard off eBay for $6) and equipped with PCMCIA WiFi (Linksys WPC64G, purchased as new-old stock for $10). System is still usable today (with some software updates, but barely). Computer has no Ethernet adapter and only one USB port.
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4/16/17
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Got a new Hohner Blue Harp from my son under Christmas tree. This is the result of 30 minutes practice. Apparently I have a lot of room for improvement, but the harmonica sure sounds great - much better then cheap plastic one from known biggest retailer.
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