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Recent content by Thrashbarg

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    Single Instruction Computer Architecture

    So I've gone mad. I've written an emulator for a SIC (aka OISC, but One Instruction Set Computer isn't right) and will implement it in hardware in the next few days or weeks, whichever happens first... The idea is the instruction it executes is Subtract and Branch if Negative. Each instruction...
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    Analogue Pong Game

    Hi, I've made myself a 100% analogue game of Pong. Circuit diagrams and some demo videos are here http://kaput.retroarchive.org/pong.html The idea came up on IRC (gimpnet, #vc) when we were talking about the General Instruments AY-3-8500. Not wanting to step down from a challenge, I went...
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    Motorola 6809 Application Notes?

    Hi, I'm looking for some application notes on the Motorola 6809, specifically the ones involving multiprocessor applications. I'd like to see if a multiprocessor system is viable. I have seen http://www.bradrodriguez.com/papers/ which has an article about using the 6809 in a multiprocessor...
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    FM Synthesis (YM2151)

    Hi, I'm back at building synthesizers again. This one is based around the Yamaha YM2151 FM synth I pulled from a dead arcade board. Some demos http://www.youtube.com/watch?v=qtGIF5vdcEg http://www.youtube.com/watch?v=etBmrJAaA0o http://www.youtube.com/watch?v=itcHj46oaK4 <-- I'm particularly...
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    The Holy Bible in BASIC

    http://uncyclopedia.org/wiki/UnBooks:The_Holy_Bible_in_BASIC
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    Mac Classic to Television conversion

    Hi, I've come up with a crazy short term project... converting a Mac Classic into a B&W television. I'm sure I can do it myself, it's just a matter of changing some components to suit the slightly lower time base used in PAL television. The line rate for PAL is 15625Hz and I believe the line...
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    non-binary DRAM

    Hi, I'm playing around with the idea of memory (even a computer?) that isn't based on the binary system. What I've come up with is a method for storing, say, 5 discrete levels of voltage in a capacitor. I plan to expand this to several capacitors on a refresh system. The upshot of this method...
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    The 8-bit SID Chip Sandwich Show

    http://www.youtube.com/watch?v=Q-pqvoUQ31M http://www.youtube.com/watch?v=tVIZrQz6KT8 :D Enjoy!
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    Ym2151

    Hi, I've found myself a YM2151 and have fitted it to the 8080 as an improvement over the AY-3-8910/YM2149 - problem is I can't get it to sound. The documentation for it is very obscure. Can anyone help? I'm positive the wiring is fine, all control signals are correct when I single step the...
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    Booting Ultrix V4.3 on a VAXstation 4000/60

    Hi, I am quite desperate to get this going, I've been scouring the Internet for anything that has anything to do with this, but with no luck. I've got a copy of Ultrix V4.3 on CD-ROM which doesn't want to boot on my VAXstation, using several different CD-ROM drives and configurations. It...
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    Where to get Ultrix?

    Hi, Does anyone know where to get Ultrix or similar? I've got a VAXstation 4000/60 with OpenBSD (because it has framebuffer support) and it is painfully slow :( Thanks.
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    SID Synthesizer

    Hi, I've got plenty of old Commodore 64's and parts for them around here so I've built a SID synthesizer into a cheap toy piano. It is made up of: - 6510 MPU - 6264 8k RAM - 28C256 32k EEPROM - 6526 CIA - ADC0804 Analogue to Digital converter - 6850 UART (to be added, MIDI support) -...
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    Programming the MC6845

    Hi, I'm making an MC6845 video card for my 8080 computer and I'm having difficulty programming it. I've calculated the registers to what seem to be appropriate values but I'm getting some very odd frequencies on the HSync and VSync pins. I'm certain that the chip is receiving the correct data...
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    IBM PC/XT FTP server?

    Hi, Has anyone done this? I'd be interested to see what software and hardware was used. I've got my XT out of the shed and cleaned it up, but the 16-bit Intel EtherExpress Pro/10 crashes the thing when it receives a packet after the packet driver is installed. The card has an 8-bit mode and...
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    Looking for a Windows 3.1x Shell Replacement

    Hi, Ages ago I had a CD full of shareware and freeware DOS software. One of the titles was a Windows 3.1 shell replacement which gave the desktop a Motif style. I loved it to bits. This was when I was still running an Acer 486DX66 in 2002/2003. Memories... I can't remember the name of it nor...
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