Negative Charge @charge_negative

Retro-musician, 8-Bit, 6502 negativecharge.github.io negativecharge.bsky.social Joined March 2021

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Negative Charge @charge_negative

2 months ago

@RamtopR Awesome! Can’t wait for this to be available.

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Negative Charge @charge_negative

2 years ago

negativecharge.bsky.social - See you over there!

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Negative Charge @charge_negative

2 years ago

Still working slowly on the BBC Micro Music Driver. Just about to add in SWRAM support. The player now loops correctly through all tracks on disk, so not too far from putting this up on GitHub. FYI - I'm slowly migrating over to 🦋 - @negativecharge.bsky.social

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Negative Charge @charge_negative

2 years ago

I've updated the BBC Micro music driver and player to have similar capabilities as the Acorn Electron version... track looping, on-screen controls, restart track etc. Just need to add some vu-bars and add in multi-part tracks/SWRAM support and I'll release to GitHub.

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Negative Charge @charge_negative

2 years ago

@knelf It is, and you can: stardot.org.uk/forums/viewtop… It’s emulated in Elkulator, and I’m looking into creating a driver for it.

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Negative Charge @charge_negative

2 years ago

How about a bit of Unreal II by Purple Motion on the Acorn Electron? (albeit with no volume control, limited frequency range, no noise channel and only a single tone channel)

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Negative Charge @charge_negative

2 years ago

A bit more progress on the Acorn Electron music driver and player. Added keyboard controls for advancing through tracks, and some placeholder graphics. I thought I'd try converting a few demoscene tunes. This one isn't too bad for a single channel device with no volume control

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Negative Charge @charge_negative

2 years ago

A few more updates to the Acorn Electron Music Driver. I've created a basic header for the file format to store track info, and allow the driver to auto-detect playback speed. Here's something that's missing from the Elk version of Elite. Maybe I can hack this into the loader.

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Negative Charge @charge_negative

2 years ago

More Acorn Electron experiments... I've switched to an IRQ1V interrupt handler and can switch the register printing back on. Playback tempo is more predictable. Here's a new conversion of the first track I converted to the Elk several years ago. At 100hz it's an improvement.

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Negative Charge @charge_negative

2 years ago

Another Acorn Electron experiment... a 100hz conversion of the C64 SID - Cybernoid II. It's a little rough currently. I've disabled the register printing as it impacts playback and needs optimizing (as does the streaming decompressor). If only the Elk had a 1kHz interrupt...

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Negative Charge @charge_negative

2 years ago

A correction on what’s shown in the video - Into Battle is actually composed by Shiru and stands head and shoulders above the other beeper tracks in that game.

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Negative Charge @charge_negative

2 years ago

Returning to the Acorn Electron, which was my first computer, I've written a converter for MS-DOS beeper music to the Electron's ULA. The ULA uses a simple counter for sound, and there's no volume control - what you're hearing is a single channel using arpeggios.

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Negative Charge @charge_negative

2 years ago

@Jameshhoward Thanks. Not yet, but soon. Some driver optimisation to do and improvements to the player… then I’ll package it up with the converter and stick it on Github.

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Negative Charge @charge_negative

2 years ago

@andyinthecloud Thanks! I’m posting most of what I’m doing as .vgm files at the moment, which already contain a BBC Micro compatible register format. These can be converted for playback. I’ll get back to posting compiled albums in .ssd format at some point soon. github.com/NegativeCharge…

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Negative Charge @charge_negative

2 years ago

Random C64 SID to BBC Micro SN76489 Conversion Track: After Burner [from the arcade game After Burner II] Artist: Adam Gilmore (orig. Hiroshi Miyauchi) Year: 1988 #bbcmicro #sn76489 #commodore #c64 #sid

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Negative Charge @charge_negative

2 years ago

Some new music for the BBC Micro... a cover of Cocktail Hour by FADE made in Furnace by Abstract 64 (@64abstract). Here's the track running in a BBC Micro emulator. Had to convert to 15-bit LFSR / playback at 60Hz, but sounds great - listen to those drums at 30s, and that echo!

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Negative Charge @charge_negative

2 years ago

Another VIC-20 music driver ported to the BBC Micro so I can convert some more tunes - this time it's MOD2VIC. Track: A VICious Groove Artist: raphaelgoulart Year: 2015 #bbcmicro #sn76489 #commodore #vic20 #mos6561

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Negative Charge @charge_negative

2 years ago

I've managed to get the VIC-Tracker 2.0 driver running on the BBC Micro and have started converting a few .vt files (jumping through many hoops). It's not sounding right yet, but can post some examples soon. Meanwhile here's a great new track - Flow by Enfys from Evoke 2024.

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Negative Charge @charge_negative

2 years ago

I've now managed to get the VIC-20 Fisichella music driver by Aleksi Eeben running on the BBC Micro with some binary patching of registers, so can now convert some more tunes. Track: Easygoing Artist: Aleksi Eeben #bbcmicro #sn76489 #commodore #vic20 #mos6561

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Negative Charge @charge_negative

2 years ago

After a bit of disassembly and register address patching, I've got one of the VIC-20 music drivers running on the BBC Micro and capturing register writes. Next step is to get the driver to write directly to the SN76489. Eight Dollar Math - 4mat/Ate Bit #sn76489 #mos6561