SNK Neo Geo MV1a Z-80 Error Repair.

Defect:

• No Sound (Z-80 Error)

Repair:

• Replacement of the Z-80 CPU in PSOP40 format.

Note:

• The error message “Z-80 Error” means everything and nothing, may be faulty the Z-80, SNK MASK-ROM SM1*, SNK NEO-D0 or also the YAMAHA YM2610.

With the Neo Diagnostics bios and with the M1 ROM burned and installed on the CHA Board of any NEO GEO cartridge, the problem can be better identified.

It is said that the error C3/00 that you see in the photos of NEO DIAGNOSTICS (write: C3 but reads: 00) is an almost assured a CPU problem, in fact, in this case it was.

The Z-80 CPU in PSOP40 format has been recovered from a failed SEGA GameGear.

Gallery:

source: neogeo diag

A new firmware update for the fpgaSID has been released by andi6510.

Below the changelog taken directly from the website.

Main changes:

• New 6581 bias setting range and curve. Per default the bias is now tuned to a brighter sound which is the most audible difference to revision 09.
• Some further improvements on the 6581 filters.

New Features:

• LEDs can be switched off now.
• The outputs can be switched to a mix of both SIDs allowing mono setups with a single speaker.
• The firmware flashing procedure has been improved to increase the success rate.
• FPGASID is now compatible to the EasyFlash 3 module.

Note:

• Important! Before updating the firmware, please read the documentation on flashing in the ConfiGuru manual.

Download: fpgaSID Firmware ver. 0A (1052)

source: fpgasid.de

This is the official demo party results from BCC #13. See also the CSDB BCC #13 section for more informations and download.

C64 Demo:

• 1 – Snakepit by Delysid
• 2 – Beezarro by Atlantis
• 3 – Week in Progress by Mayday!

C64 Music:

• 1 – Nappy Go Lucky by Toggle
• 2 – Cellar Door by Snabel
• 3 – Mein Verlies by Spider Jerusalem
• 4 – Trainride by Røly
• 5 – Space Invaders Medley by Mibri
• 5 – La chevre by Glafouk
• 6 – Curlin’s Theme by Bordeaux
• 7 – BCC 2019 by Sonki            

C64 Graphics:

• 1 – White Rabbit by Awsm
• 2 – Fairy King by Fabs
• 3 – Championship Wrestling +3D DirArt    
• 4 – Elostelija by XynnM    
• 5 – Service Stop Guests by Viza
• 6 – The Optimistic Skipper by Luisa/Oni    
• 7 – A Small Riddle by Lobo    
• 8 – Zilicious by XynnM
• 9 – BCC #13
• 10 – Chagizzz by XynnM

C64 Fast Intro:

• 1 – Punk a chiens by Dentifrice
• 2 – Antz by Delysid
• 3 – Space Invaders by Hokuto Force
• 4 – Ode to RRR by Excess
• 5 – Zwartennerd by Excess

Productions released outside compos:

• Championship Wrestling +3D by Excess (Crack)
• Greetings to Delysid by Fake (Graphics)
• Yie Ar Kung Fu + 4HD by Excess (Crack)

Download: BCC #13 Full Party Stuff (1019)

source: csdb.dk

Nobomi has made a new revision of the ARMSiD PCB which however has the same hardware features as the previous one.

A new firmware update for the ARMSiD has also been released by Nobomi.

Below is the changelog taken directly from the website.

Differences between FW 2.8 and previous version:

• The start and the end of the bus data cycle (reading or writing) is now controlled by signal CS only (it was the same on the beginning of the cycle, but the end was controlled by 02 clock before), it can help with a bus stability in other systems than C64 a C128.
• Internal frequency generators are updated with precision of one 02 clock – about 1us (no audio signal phase changes after frequency retuning) !
• Correct polarity of the bandpass filter.
• Added emulation of internal filter voltage offset.
• Added the “Digi Boost” feature by software – an effect similar to adding 330kOhm resistor between EXTin and GND on the MOS8580.
• Other speed optimization.

Gallery:

Download: ARMSiD v2.8 (17/2/2019) (1138)

source: dzi.n.cz/8bit/armsid

Hoxs64 written by David Horrocks is a Commodore 64 emulator for Microsoft Windows 2K/XP/Vista/Seven (DirectX 9+)

The emulator substantially reproduces this legacy machine in minute detail.

Changelog (v1.0.18.0):

• Fix 1541 drive memory map that was broken since v1.0.14.0. The title Intoxication by Singular is now working again.

Download:

• Hoxs64 32/64 bit v1.0.18.0 (878)

source: hoxs64.net

Project born in 2017 for my SX-64++

I wanted to improve the schematics and make a PCB, the previous version was made on prototyping board pcb.

I have also added some features that i need when i will install the FPGASID in the SX-64++ and like the previous version the sidSwitcher integrates perfectly with the Overlay-64 & Keyman-64.

This circuit is not for sale. Schematics, Gerber and Atmel hex will be available soon for Download.

P.S: This project can also be used as a simple SPDT of analog audio signals. 2 INPUTS and 1 OUTPUT.

Features:

• Output for Overlay-64 (http://henning-liebenau.de/overlay64/)
• Input Push Button or Keyman-64 (http://henning-liebenau.de/keyman64/)
• Bicolor LED (SID1 GREEN / SID2 RED / SID1 + SID2 ORANGE)
• Output Mono or Stereo SID1 (LEFT+RIGHT / LEFT) / SID2 (LEFT+RIGHT / RIGHT) / SID1 + SID2 (LEFT+RIGHT / LEFT-RIGHT)
• Possibility to use the mute function.
• Jumper for configuration.

Schematics: (Prototype and Final):

The following photos are of the first version, second enhanced version, prototype breadboard and pcb.

The RGB LED strip (APA102C) is a feature that has been added since the firmware version V1.0D, this version will be released very soon.

In the photos you can see two different Keyboard Mount Set and Accessories, in the first 7 photos (Transparent case) i have used the KIT sold by PixelWizard.eu and in the following 10 photos (SX-64 style case) i have used the kit sold by corei64.com

Both KITs do their job and integrate perfectly with the case.

Just a note, but it was my error, i didn’t read the description written on the site, the kit sold by corei64.com is not compatibile with the U64 motherboards v1.0 because there is a keyboard adapter, i solved quite easily by cutting a piece of plastic of the right side keyboard support.

The two ULTIMATE 64 custom stickers with their S/N and the SX-64 Style C64C Case are on sale on PixelWizard.eu.

The transparent C64C case is no longer available and comes from an old campaign on Kickstarter.

Gallery:

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Video: