My contribution

[Guest MindRealm]

Hi all

My first post here.

Just wanna say,  I've been browsing the site, and I'm lovin all the reference and code.  If anyone is interested, I have HC11 code and schematics to share in return.

See. . .I have a fully MIDI capable SID synth that I designed and built with an HC11 as a final project at a technical college.  We were learning HC11 and had proto-boards, so my synth was constructed on the board. . all shoddily wire-wrapped.  It consists of the standard 3 jack MIDI interface, 3 buttons, 8 menu assignable pots, an LCD menu system that controls all SID options, pots, and can save presets,

Logically, I think I worked all bugs out, so it works perfect.

The problems are that the audio is kinda noisy, I'm quite sure because of the wiring job, and I have a power supply that will overheat and shut down in about 20 minutes.  .  I wanna rebuild the thing on it's own PCB, it would be smaller, less noisy, and I could lose a few unnessesary chips.

Anyhoo.

Now that I'm done school and board. . .I've been teaching myself PIC with a few projects (I no longer need eeproms and latches)

A Pic at the same speed as my HC11 takes way less cycles. . .so a pic 5 times as fast (20MHz) would allow for all kinds of neato stuff.  I never did create software envelopes or LFOs, but I surely could.

PIC just seems a little less straightforward as to how certain things are accomplished.  I'm used to extended addressing modes, and reading and writing to the SID just the same as all memory locations on the same map.

I'm figuring it out . . .and I'm just thankful for this excellent web page.

Message me if you want any HC11 source or whatnot. . .

I can't remember how large the files are, but the entire thing takes just 7 some kbytes on an EEPROM.  I actually realise that it could probably be reduced in size by half with some adjustments, but hey, I'm a beginner.  I pre-warn that the compiler we used was less than typical, so some syntax and most directives (not opcodes) are different than typical motorolla assemblers. . .but similar enough to easily translate.

Regards.

Sada

MindRealm Records