Haven't ordered yet. If you want one, please send me the 25 Euros by
PayPal (paypal@xxxxxxxxxxxxxxxxxx) by Friday and I'll place the group order.
I'll take care of shipping and PayPal fees.
David, Ian, and Frank, anyone else?
On Mar 28, 2016 3:50 PM, "Frank Michielli" <bigmanfrank@xxxxxxx> wrote:
Did you order yet?
Would like one as well.
_o/ Sent with Unibox <https://www.uniboxapp.com/t/isig>
On Mar 25, 2016, at 6:59 PM, Leif Bloomquist <leif@xxxxxxxxxxxxxxxx>
wrote:
Hi all,
I just learned of a cool project called the "SwinSID Ultimate", which
is a much improved version of the Nano SwinSID that came out a few
years ago. It's a microcontroller-based SID replacement that you can
put in place of the original.
There are a number of cool features, but two things I like best are
the integrated LEDs (!) and the ability to configure it + swap
8580/6581 emulation through POKEs instead of switches.
The creator is asking 25€ +5€ shipping (+ paypal fee) and I'll
probably get one. Anyone else interested (for combined shipping)?
Pics are on Facebook, and full "manual" is below.
https://www.facebook.com/groups/commodoresixtyfour/permalink/10153322915882172/
S W I N S I D U L T I M A T E
=================================
(formerly known READELUX)
U s e r s M a n u a l
========================
credits:
--------
base work --- Swinkels
feature enhancements --- CodeKiller, Hermit
quality improvements --- Hermit, CodeKiller
manual written by CodeKiller
Introduction
============
SwinSID Ultimate is a HIGHLY ENHANCED version of the original SwinSID
design by Swinkels; so much so, that almost
the entire code has been rewritten.
Due to wast differences in 6581 sound, this project aimed to be more
like the 8580 (with digi boost), but also has
support for 6581-like characteristic* (see later)
It has full feature compatibility with the original SID (over the old
SwinSID):
- paddle/mouse support
- readable registers (OSC3/ENV3)
- external audio in** (see later)
- bitfade
- proper ADSR-bug support
- fast ADSR attack rate (thanks to the self-correcting rate-counter)
- 'Lazy Jones' and '180' -like gate and test-bit workaround (no missing
note)
- proper 23bit noise-waveform calculation --> better "random" numbers
- full 3V p-p output range w/o 1KOhm load (same as 8580)
- improved filter quality (16bit) and resonance-table for both SID model
- improved waveform calculation (full 16 bit)
- high resolution combined waveform-tables
It has enhancements over the original SID:
- clean anti-aliased bandlimited sound at high pitches
- undistorted mixed digi tunes and eliminated volume-change click
thanks to AC/DC separation of master volume register
- Softconfig -- software configurable options for a number of aspects
of the operation*** (see later)
- change between 8580/6581 behaviour (filter, ADSR, combined waveforms)
- change between PAL/NTSC pitch
- enable/disable external audio input (less external noise)
- if enabled, then CAN be enabled to sample trough OSC3 register
- enable/disable startup "ding"(beep)
- upload 3 banks of 256 bytes custom waveforms
- "transparent" mute for channels -- does not affect the sync, OSC3/ENV3,..
- LEDs which intensity represents the active channels volume
- LED displaying the active (classic) digi playback
- or in case of the new Mahoney-digi, the entire array acts like a VU-meter
Features from the original (nano) SwinSID:
- digi-boost for classic digi samples
- SounDemon digi support (ex: Fanta In Space )
- lower operation noise (if the external audio in is disabled or
terminated)
- works in every board, only 5V required
- does not use the filter-capacitors (pins 1-2, 3-4) (values are
irrelevant)
- same form factor as the original SID
- low power consumption (still after the enhancements)
- modern components with better ESD protection
Technical details
=================
This module is the same form factor as the original SID (DIP 28) but
does not utilise all pins the same way.
In the place of the pins for the filter capacitor connectors there are
two jumpers:
(+ marks the default/recommended position)
PIN1-2 -- CLOSE +: normal operation (no programming) / OPEN: atmega88
can be reprogrammed
(by default, the program is protected against reading)
PIN2-3 -- OPEN +: normal output volume / CLOSE: reduced output volume
(in some rare cases it may needed if paired up in dual SID...)
The +9/+12V supply is not needed:
PIN28 (Vdd) -- not connected
PIN27 (Audio out) -- because the sound generation uses phase-correct
PWM outputs, theres is a ~72,7kHz carrier at any time
with filtering it's amplitude has been reduced
but still can be detected
also, because the module powered from only 5V the
output level may be lower than of a normal SID
it is advised if you put it in place of a
6581, remove/disconnect the 1K resistor pulling the output to the
ground
recommended in place of 6581:
S |
I |
D |
27|-----*---.....
| X <--- disconnect/remove
| '--\/\/\-----,
1k |
---
PIN26 (Ext in) -- it's not an analog mixing anymore, but goes digital
trough an ADC, so can be read/record data by the computer
but because of the construction of the input
stage in a C64, there can be a lot of noise coming in if switched on
a termination resistor (for ex 1K) recommended
before the AC-coupling capacitor
recommended if ext in required:
S |
I |
D |
26|---------||----*---< ext audio in
| |
| '--\/\/\-----,
1k |
---
Sound generator
---------------
Voice generators:
------------------
To simulate the SID chip, the module generates 3 separate voices and a
"classic digi" channel in with the master volume bits.
These waveforms are calculated in 16bit resolution before adjusting
the volume and mixing to the output.
The 6581 compatibility had been greatly improved with the proper ADSR
envelope and mixed waveform adjustments
beyond the differences of the filter characteristic.
The module has it's own clock source so to generate the proper pitch
it has to be set to proper mode.
Tt can be changed by SoftrConfig commands.
Over the regular waveforms there is a possibility to upload three
256byte long custom sample in place of 3 mixed waveform
selectable by the control register byte 0x9*, 0xA*, and 0xB*.
These custom waveforms are responding to the input frequencies the
same way as the regular waveforms.
In case of a Mahoney-digi condition has been detected, the module
switches to an alternative execution route and reads the
desired output levels from a data-table.
Selectable operation modes: PAL / NTSC
Base clock for PAL: 985248Hz
Base clock for NTSC: 1022727Hz
Calculation resolution: 16bit
Output stage:
-------------
The sound output is generated by two phase-correct PWM sources combined.
The carrier signal is a triangle waveform.
The output range has been optimised for the timing restriction too.
The output stage is a dual-PWM combiner with a ratio of 220:1
The lowest response (input register to sound output): 1/36363 =27,5 uSec
DAC resolution: ~15,5bit (220*220)
Carrier frequency: 32MHz/220/2= ~72,7kHz
Sample rate: ~36,3kHz
Signal-to-Carrier ratio >20dB (can be improved with further LPFs)
LEDs
----
This module features an array of 4 LEDs to display informations about
the sounds.
Note mode:
By default, the first 3 LEDs' intensity represents the 3 voice's
volume (current ADSR envelope)
The 4th LED displays if a classic digi has been playing (the 4 bit of
master volume)
If the Mahoney-digi condition has been detected, the LEDs act like a
VU-meter, displaying the master output level.
RW mode:
In this mode, only the first 2 LEDs working to indicate the register
writes and reads.
This mode is real-time, so the brightness could be really faint.
Inverse note mode:
Due to the LEDs are driven by the CPLD, the sourcing current is much
lower than what it could sink.
So if the LEDs has been added/changed, in this mode it can produce
higher brightness.
But it's highly recommended to use some proper LED-driver circuit if
you need brighter/bigger light output!
In that case, the driving polarity can be changed to match the
requirements of the driver circuit.
ADC input
---------
Ext in:
-------
The external audio input is mixed in to the output digitally after an ADC
stage.
Therefore it is possible to enable/disable it or if enabled, then
record the values by the host.
(f the Mahoney-digi condition has been detected, the ext in audio not
processed, not mixed to the master output)
Maximal volume range: 5V AC (peek-to-peek)
Input offset: 2,5V (use AC-coupling capacitor)
Maximal sample rate: 36,3kHz
Working resolution: ~8bits
POTx/y:
-------
Electrically works the same as the original SID -- samples the input
and compares it to Vcc/2
It uses it's own clock source. The result of the conversion is
available after some data transfer.
Resetting the module does not resets the comparator's counters.
Capacitor charging time: 256uS
Capacitor discharge time: 256uS
Data acquiring delay: ~7uS (during discharge phase)
Vref= 2.3V
Discharge current: ~30mA
Addressing
----------
Write to registers:
-------------------
Although the proper edge-based register writing can't be handled, with
a sufficient precharge time and stable signal
the module can operate indistinguishable to an original SID.
After the write conditions met ( PHI2(CLK) low, R/W high, CS low ),
the module starts an interrupt
in there it reads the address lines, then the data lines.
Taddr_pre_min Write condition to address valid: ~170nS
Taddr_hold Recommended address valid time: ~150nS
Tdata_pre_min Write condition to address valid: ~200nS
Tdata_hold Recommended data valid time: ~150nS
Twrt_cnst_min Time between consecutive writes: ~700-1000nS
(please make sure the write conditions does not "flicker")
Reading from registers:
-----------------------
Reading the registers however works as expected, valid on the falling
edge of the clock.
OSC3/ENV3 register values updated only once per sample-cycle.
Maximal read response time: <100nS (read condition to data valid)
Maximal data response time: 28uS (internal data OSC3/ENV3
change to register value)
SID model auto-detection
------------------------
There has been a few codes aimed to detect the SID type in the C64.
These relying on a small timing difference between the 8580 and 6581.
But because this SwinSID can not respond in cycle-exact way, these
codes would (usually) thake the 'else' route that means detected as
8580.
Be aware: even if the module set to 6581 mode, these programs will
still detect as 8580 which could cause distorted sound!
Normal operation of the module
==============================
Normal operation of the module is same as MOS 6581/8580
please refer to the manuals and the tutorials by the C64 community :)
...
