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Found 5 results

  1. I've been meaning to start a topic about my abbuc hardware competition entry, a replacement for the Pokey chip. It's been mentioned in a couple of threads but I thought many people may have overlooked it. I tried to be sensitive to cost in my design, though once the full details are released (after competition result) it will be fun here to brainstorm ideas to make it even cheaper! Clearly there are still plenty of real pokey chips, however the supply is starting to become more limited and prices are on the increase. --- PokeyMAX Introduction The PokeyMAX is a complete replacement for the Pokey chip. It is derived from the work on the EclaireXL project, a complete FPGA based Atari 800XL clone. The intention is to build replacements for all of the Atari custom chips using this technology and Pokey has been built first. It can be used either to replace a broken/missing pokey, as a stereo upgrade, or just for fun! Features If pokey is socketed, zero wire installation (mono) Dual pokey mode Pins for 3 audio outputs (left channel/right channel/mixed) Small footprint, only a few mm larger than original IC Supports all features: 8x paddle inputs, IRQ, serial I/O, audio output, two tone mode, high pass filter and keyboard scan High level of compatibility Digital logic The PokeyMAX is built around the Altera MAX10 FPGA. This was chosen due to its integrated flash memory, power conversion, small size and low cost. The contained logic itself is described in VHDL and Verilog and then synthesized using the Quartus II software. Level conversion Most modern FPGAs no longer support 5V logic. While it is possible to find a few they are a vanishing breed. The MAX10 only supports up to 3.3V logic, so an IDT quickswitch level converter IC is used to connect to the high speed lines (A/D/IRQ/serial io etc) safely. Chip select Unfortunately I needed more level conversion lines than provided. TI came to the rescue with some 5V tolerant multi-function logic chips with which I was able to combined CS/!CS into one. Power The MAX10 requires a single 3.3V power supply, it then internally generates the rest of its supplies. This is very convenient, since often FPGAs require 3 or more different voltage levels. There is a switch mode regulator (LM3670) to convert from 5V to 3.3v in an efficient fashion. Paddles These are handled by charging a capacitor that we then check the level of using an LMV339. This is similar to the well-known LM339 comparator, except much smaller! The comparator is used since the level can be set very precisely rather than relying on when the FPGA detects a logic high. The level itself is set to 2.2v using the voltage divider on the right. It is also convenient since its open drain output means there are no level conversion issues. For the drain transistors, a 5V tolerant IO extender chip is used. The FPGA communicates with this over an I2C bus. Keyboard scan An IO extender chip drives the 6 keyboard lines and then reads the response. This is convenient since it only requires an I2C bus to the FPGA and the IC is much smaller than the level converters. JTAG The core may be upgraded or debugged using an Altera USB blaster connected here. Several of the JTAG pins are dual use and can be used as general IO. So we could for instance in future plug in i2c devices here or use for A5 (with external level converter) to allow quad pokey or sid etc. Audio filter The audio output uses a delta sigma dac. An RC circuit is used as a simple audio filter to smooth the output from this. There are four audio outputs, which are currently fed to pin 37 and 3 header pins (left/right and mixed). Note that the next stage much not draw a lot of current from the rc filter or it will cause distortion. A4 Pokey has 4 address pins (A0-A3). To make space for a 2nd pokey another address line is needed. For stereo connect to A4. Errata: Note that the "paddle capacitors" should not be populated and RA1 should be 0 ohm since these are already on the main board, this was a schematic error.
  2. Not exactly a home run of FLAVOUR (with a U) and texture.
  3. Hey there, im looking for a programmer familiar with intellivision basic . to write a very simple program that is basically like a modded ,more in depth version of the intellivision synth stock program that comes on the ECS . i use and love whats there by default but i would love to cycle through some more sounds to play . and if it could be made to load through the tape data slot on the ECS that would be awesome as well ,as there is not a valid multicart out anymore . id be willing to pay a bit and it would also be helping the community as well . thanks . !!
  4. I need help for a colecovision repair. When I plug any controllers on port 2 of my colecovision, the triggers won't work, even if they work in port 1. I've ordered some controller chip and soldered a new one but the triggers still doesn't work. I don't know what to do anymore but I don't want to throw it away and buy another colecovision, this one is important for me. If someone could help me I would really appreciate it. Thank you for your time^^
  5. hey guys , i have a mssiah synthcart from 8-bit ventures for my c-64 and i was wondering if there exists anywhere a synthcart for the atari 8-bit machines to access the pokey chip in a similar way as mssiah. i have looked every where and even asked 8-bit ventures if they would do one and they said they had no intentions of making one . if one does'nt exist, is there anyone that knows basic well enough to make something like this ? could put the program on a flashcart maybe ? and modify the computer with midi? Also does anyone do midi modifications to the 800xl ? i just really want to be able to control the pokey chip through my daw and midi sequence it like i do with my c64. i love the way the pokey sounds , probably even over the SID. any good direction on this would be awesome . please help i have been trying for well over a year for a solution . thanks alot
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