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ARMSiD (6581/8580 Replacement) by Nobomi

ARMSid (6581/8580 Replacement) by Nobomi

ARMSid (6581/8580 Replacement) by Nobomi.

Non ho resistito alla tentazione e ho voluto provare anche questa nuova emulazione del SID 6581/8580 con l’STM32F410 ARM Cortex M4, sto parlando dell’ARMSid di Nobomi.

La spedizione veloce e la cortesia di Nobomi sono sicuramente il punto forte, ma anche la confezione, l’integrato ARMSid viene spedito in un contenitore di plastica onde evitare qualsiasi problema con la spedizione.

Il suono e il feeling “sonoro” sono buoni come lo era per lo SwinSID Ultimate ma meglio, personalmente collocherei l’ARMSid come fedelta’ di emulazione tra il SID Originale e il SwinSID Ultimate, Nobomi sei stato molto bravo, complimenti.

Nobomi inoltre ha scritto un software per Commodore 64 per configurare le varie opzioni dell’ARMSid e un’altro software per aggiornare il Firmware.

Alcune informazioni prese dal sito di Nobomi in Inglese:

What is it ?:

  • A new replacement of the MOS6581 and MOS8580 used in the Commodore C64. It is minimalistic (in simplicity of circuit and use, not in function and power).
  • Real “plug & play” solution. Just insert instead of the original SID into the slot and it’s done.
  • It determines (through supply voltages) which chip it replaces and starts the appropriate emulation (it can be changed later in software).
  • No need to switch the PAL / NTSC version, the circuit uses directly the clock from the computer bus, always synchronous with the C64.
  • It also emulates analog inputs (joysticks, mouse, etc. – POTX and POTY inputs)
  • Analog output is sufficiently buffered, it is not necessary to change anything on the computer board for proper operation.
  • Output sampling frequency is 1/16th bus clock of C64 (approx. 62kHz), real 12bit D/A converter, no pwm.
  • Filters completely transferred to digital form, emulated by float point arithmetic.
  • Significantly lower noise level and less interference from the power supply than the original :)
  • Lower power consumption than the original.
  • Firmware update possible inside the C64.
  • Emulates all waveforms, and even “samples” (at least some of them, Ghostbusters laugh, Chimera screams at you).
  • Full support of analog filters (LowPass, BandPass, HighPass, combination, Q quality control).
  • Emulation of OSC3 and ENV3 registers (little delay, approximately 16 clocks of the C64 bus).
  • Joysticks and mice work.

What is inside ?:

  • A few resistors, capacitors, one stabilizer, one opamp and a processor. That’s all, parts only from one side.
  • The only programmable circuit is the STM32F410, ARM Cortex M4 with HW float point arithmetic at 100MHz.
  • Analogue output amplified via the AD8515 opamp.
  • Stabilizer for the 3.3V processor, the processor itself has 5V tolerance inputs.

Firmware:

  • New features in FW 2.6:
  • Optimization for speed again (approx. 10ns more faster response to read registers, faster processing of writing registers).
  • New features in FW 2.5:
  • Again faster interrupt (approx. 10ns more faster response to read registers).
  • New features in FW 2.4:
  • Further optimization of the interrupt (approx. 20ns faster response to read registers).
  • New features in FW 2.3:
  • A part of source code (interrupt routine) has been rewritten in assembler and manually optimized.
  • It makes a possibility to control the bus only through the CS signal (no need for O2 clock synchronization, so it can run on systems with a different CPU than MOS6502 now).
  • Low frequency limit and filter strength settings and saving settings to permanent flash memory.

Gallery:

Download:

ARMSiD Video:

source: ARMSiD Homepage

  1. Jeremy
    7 November 2018 a 16:19 | #1

    This is amazing and very much needed. Is there a gerber or a list of parts available?

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