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Message |
Forum: Emulation and Simulation Topic: Virtual Machines and CPU emulation - update |
| mkarcz |
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Posted: Thu Dec 28, 2017 11:40 pm
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Replies: 3
Views: 3219
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| I recently e-mailed Mike and asked if my emulator was worthy to be added to the 6502.org's emulators section. He agreed and it is now added. This is when I found this topic. I wish I checked the forum more often. Perhaps I will try it as New Year's resolution :-) One has got to be up to date with ne... |
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Forum: Emulation and Simulation Topic: Symon: Yet Another 6502 Simulator |
| mkarcz |
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Posted: Mon Feb 22, 2016 5:53 am
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Replies: 16
Views: 8447
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| This is brilliant! I built version 1.3.0-SNAPSHOT and fired up EhBASIC. Nice GUI. It will be a valuable tool for any MOS 6502 enthusiast. I did full MOS 6502 op-codes implementation in C++, including BCD mode: https://github.com/makarcz/vm6502 My emulator is nowhere as advanced as yours, just consol... |
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Forum: Emulation and Simulation Topic: Emulator with PC I/O Support |
| mkarcz |
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Posted: Sun Feb 21, 2016 9:08 am
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Replies: 2
Views: 2024
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| Nice. I'm doing something similar, project in progress, 6502 emulation, possibly something more in the future. Rudimentary character I/O is supported. Blog entry: http://leisureprogramming.blogspot.com/2016/02/virtual-machines-and-cpu-emulation.html Code: https://github.com/makarcz/vm6502 I already ... |
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Forum: Hardware Topic: 6502, I/O buffered bus and DS1685 RTC. |
| mkarcz |
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Posted: Tue Dec 08, 2015 7:28 am
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Replies: 4
Views: 992
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| The stupidest thing caused the RTC problem on CPU bus - the connection issue. I have been connecting the RTC circuit built on the breadboard to my mobo with cables to slot B2 on the CPU bus. That particular slot had a connection issue on pin A25 (data pin D3) - which simply did not have an electrica... |
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Forum: Hardware Topic: 6502, I/O buffered bus and DS1685 RTC. |
| mkarcz |
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Posted: Sun Dec 06, 2015 2:45 pm
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Replies: 4
Views: 992
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| Jeff, you're correct. No multiplexer. Instead, the address/data are provided by hardware/software combined emulation in 2 steps. The 74LS138 decoder with its address selection lines connected to pins Phi2, R/W and A0 depending on what's happening on the bus will select output pins that drive DS1685 ... |
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Forum: Hardware Topic: 6502, I/O buffered bus and DS1685 RTC. |
| mkarcz |
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Posted: Sun Dec 06, 2015 4:29 am
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Replies: 4
Views: 992
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| Hi guys, I hope you can advise me on a problem I am having with my design. My 6502 based general-purpose system is build around a mother board with 2-sided bus, which has a CPU side and buffered I/O side, both separated with 74LS245 transceivers. I gate the buffer that separates data lines with sign... |
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Forum: General Discussions Topic: beginners' 6502 articles in the works |
| mkarcz |
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Posted: Sat Jun 07, 2014 4:02 am
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Replies: 71
Views: 5749
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| Congratulations are in order. |
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Forum: General Discussions Topic: Introduce yourself |
| mkarcz |
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Posted: Sun Jan 20, 2013 6:35 am
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Replies: 695
Views: 340324
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| Lastly, thanks for the tip about starting small. I actually found myself thinking about grand stuff like a keyboard interface and some sort of display before I realized that the first step should be a 65c02, a chip for serial access over a terminal, some memory, and whatever glue chips. If that wor... |
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Forum: General Discussions Topic: Introduce yourself |
| mkarcz |
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Posted: Fri Nov 30, 2012 2:08 am
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Replies: 695
Views: 340324
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Welcome Bogogil,
That "Kiwi" is a great piece of engineering. I saw it before on YouTube.
Good to have you here. |
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Forum: General Discussions Topic: Building a simple 6502 microcomputer |
| mkarcz |
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Posted: Sat Oct 06, 2012 3:27 am
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Replies: 183
Views: 12667
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| Hi alkopop79, Just dropped in to 6502.org after a long break and notice this thread. You were looking for some basic diagram of 6502 CPU system? I got inspired by this project: http://chidesters.org/scott/meadow/Meadow_6502_SBC_User_Doc.html It is a complete minimal 6502 computer with operating syst... |
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Forum: Programming Topic: Super Forth 64 |
| mkarcz |
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Posted: Thu Jun 07, 2012 4:16 am
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Replies: 0
Views: 2238
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| Hello, I recently re-discovered my own FORTH stuff for Commodore 64. I used to program a little in this beautiful system/language and now I want to pick up where I ended 15 years ago and extend my system a bit further (I did in FORTH a 7-segment display driver, 12-hour screen clock running in interr... |
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Forum: General Discussions Topic: My recent eBay acquisitions: Apple //c and C64 |
| mkarcz |
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Posted: Fri May 11, 2012 2:00 pm
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Replies: 12
Views: 2095
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| Update: I am reading the article about differences between PAL and NTSC video systems in context of C64 software and hardware compatibility and it looks like I should probably save $$ and not to buy a new VIC chip. Appears to be a normal thing for some software titles to have problems, when designed... |
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Forum: General Discussions Topic: My recent eBay acquisitions: Apple //c and C64 |
| mkarcz |
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Posted: Fri May 11, 2012 4:36 am
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Replies: 12
Views: 2095
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| Well, my PLA repair is based on EPROM, the chip is marked ST 27C512 and it matches the description about typical PLA repairs done with these chips, that I found on the internet. Anyway, I am a little disappointed, because my PLA arrived in mail today, I replaced it and C64 still acts up the same way... |
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Forum: General Discussions Topic: My recent eBay acquisitions: Apple //c and C64 |
| mkarcz |
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Posted: Mon May 07, 2012 6:23 am
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Replies: 12
Views: 2095
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| Thank you guys for all the replies. Very helpful. I did find the 27C512 EPROM to PLA adapter schematics. I checked connections in the adapter found in my C64. All were OK. I replaced old IC socket with the new, better quality one with round pins. I re-did the adapter in fact. I soldered the EPROM IC... |
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Forum: General Discussions Topic: My recent eBay acquisitions: Apple //c and C64 |
| mkarcz |
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Posted: Sat May 05, 2012 4:00 pm
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Replies: 12
Views: 2095
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| Thanks a lot for looking, Garth! I really appreciate it! Well, if you find some time in the future and it would not be too much trouble, please send me a list of apple II related materials that you have. Perhaps I can pick something useful and we would agree to the price/shipment. Once again, thank ... |
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