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tomek s blog now i ll lie random thoughts of tomek1024 home about the author polish blog email 2025 all rights reserved tomek s blog now i ll lie rollback netplay for game boy emulator 26 jul 2025 in the previous blog post i described my work on the nintendo game boy emulator called coffee gb to this day it remains one of my most beloved projects every year or two i spend some time tweaking it adding features or fixing compatibility with particularly stubborn roms one thing that i wanted to add for a long time is the netplay support the real game boys can be connected to each other by a link cable and there re multiple games supporting multiplayer this way even tetris bundled with the console in 1989 can be started in the 2 player mode both players are sent with the same bricks and whoever plays longer wins the game boy link cable is a very simple medium it s a serial cable with 3 signal wires tx rx and clock connected consoles need to negotiate which one is a clock source it shouldn t be a problem to join two emulators with a tcp connection and use it to send these signals right read more why did i spend 1 5 months creating a gameboy emulator 09 feb 2017 for me the most favorite type of a computer program is an emulator being able to run code from a completely different hardware architecture always seemed like a magic the old computers are great on their own so this kind of connection between historic machines and the modern computing environment feels almost like a time travel as a developer i often think about the internal design of an emulator i imagined this big switch construct that chooses the right operation for the current cpu opcode and the array modelling the memory after watching the ultimate gameboy talk found on the hacker news i realized that the gameboy architecture is quite simple and maybe writing a running emulator for this kind of machine wouldn t be that hard especially that it s well documented too i realized later that it wasn t exactly the truth creating a working program was quite a challenge at the same time it was one of the most engaging and rewarding side projects i ve ever had it was also very addicting every time i had a few minutes during the day and basically every evening i felt an irresistable urge to move the emulation a bit forward fix this strange gpu bug pass one more compatibility test or implement one more missing feature read more macintosh system 6 and 7 images for iomega zip 29 dec 2016 as described in the previous post i m using scsi iomega zip z100s drive as a mass storage for my macintosh plus i prepared zip floppies with a few versions of the macintosh system installed if you re into retro computing it s fun to compare the performance and the features between different oses i dumped the zip floppies into disk images so they can be easily restored all you need is an usb zip drive z100u connected to your modern computer macbook pro in my case images can be downloaded below system 6 0 8 system 7 0 1 system 7 1 system 7 5 5 read more resurrecting my macintosh plus 08 dec 2016 i wanted to extend my vintage computer collection with a classic all in one macintosh for a long time unfortunately they are not so common in europe as in the us and the costs of the shipment are often higher than the computer itself sometimes you may find something on the local auction portal but usually it costs a lot that s why i was really happy to find a macintosh plus in an attractive price however the low cost was justified according to the description the screen was dead it also lacked of the mouse and the keyboard who cares i ve got it anyway the worst case scenario i ll get a modern art sculpture read more california 05 sep 2016 bay area travelling alone has its bright and dark sides you can neither share the excitement when you notice a sea lion swimming next to the boat nor look all the 227 meters down the golden gate bridge but you are free to do whatever you like without discussing your options with anyone for instance you can exchange one more day in san francisco for visiting the computer history museum in mountain view which probably isn t the way of spending your holidays that many would choose in the museum you will find a former ballistic missile that after its retirement started an academia career as an univeristy general purpose computer read more older newer