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Archive for the ‘Projects / Repairs’ Category

Xilinx CPLD XC9536 replacement PLA for Commodore 64

November 18th, 2009 17 comments
Replacement PLA for Commodore 64

Autopsy:

The PLA chip (906114-01) used in the Commodore C64 is a generic 82S100 gate array with custom programming.

Its logic functions were dumped and reverse engineered by the community and are available from a variety of sources. This PLA uses the Xilinx CPLD XC9536 to emulate perfectly the PLA of the Commodore 64.

Download: Xilinx CPLD XC9536 JED C64 PLA + Eagle (1398)

source: zonadepruebas.com

Atari 1040 STf TOS Eprom Upgrade v1.04

November 6th, 2009 No comments
Yep, it's works!

Some Screenshots :

source: atari-forum.com

Atari ST replace Epson broken Floppy Drive with a Teac FD235 HF

October 25th, 2009 No comments
TEAC FD235 HF

Teac Floppy Drive and some games Screenshots:

source: atari4ever

Commodore Modem 8010 Powersupply pinouts

August 31st, 2009 1 comment

din5m

  • PIN 1 = Common (GND)
  • PIN 4 = Free
  • PIN 2 = 14.6v (AC)
  • PIN 5 = Free
  • PIN 3 = 14.6v (AC)

Click here for my Commodore Modem 8010.

ZX Spectrum +3 (Issue 1) Sound Fix *updated*

August 22nd, 2009 2 comments

Sound fix diagram here. (pdf)

from Cristian Secară Homepage:

The first release (the +3) has a fatal hardware mistake: the 128K sound output is completely distorted.

  • Tech explanation: the analog output of the AY-3-8912 sound chip was intended to be amplified by a one stage common-emitter transistor. In practice, they have forgot to put a resistor to the transistor’s emitter. The result: the transistor works in switch-mode – the sound is converted from analog multi-level amplitude to digitized two-level amplitude, same as the old 48K sound system.

source: secarica.ro ay8912 Demos

CBS ColecoVision Secam RGB connector pinout Hack *updated*

June 14th, 2009 15 comments

Coleco Vision RGB Hack

ColecoVision RGB Hack:

Photo from #3 to #6 explain how to hack the RGB output signal inside the console.

ColecoVision RGB connector pinout:

__________________________________
\ o1  o   o3  o   o5  o   o   o8 /
 \  o   o   o   o   o13 o   o15 /
  \____________________________/

Pin Signal

 1  Red Output
 3  Green Output
 5  Blue Output
 8  Ground
13  Composite Synch
15  Audio Output (very low volume)

Scart RGB pinout:

   ----------------------------21
  _| 19 17 15 13 11 9 7 5 3 1 |
 |                            |
 | 20 18 16 14 12 10 8 6 4 2  |
  ----------------------------

Pin Signal                     Signal level

 1  Right Audio Out
 2  Right Audio In
 3  Left Audio In
 4  Audio Ground
 5  Ground (blue)
 6  Left Audio Out
 7  Blue input                 (0.7V, 75ohm)
 8  Function select/AV control (9.5-12V = AV mode, >10kohm)
 9  Ground (green)
10  Reserved Data
11 Green input (0.7V, 75ohm) 12 Reserved Data
13 Ground (red) 14 RGB Blanking
15 Red input (0.7V, 75ohm) 16 RGB switching control (1-3V = RGB mode on, 75ohm) 17 Ground (sync signal) 18 Ground (RGB switching) 19 Composite Out 20 Composite Input (Synch) (as in 1Vpp video signal, 75ohm) 21 Common ground (shield)

Arcade Supergun MK III Fixed for my SNK MV-2F MVS

May 10th, 2009 3 comments

Fix:

  • Video Contrast problems: i have bypassed the resistor for RGB. (Photo #6)
  • Jamma Connector is too big for my SNK MV-2F MVS: I have used a rasp for reduce the Jamma connector. (Photo #7)

source: wikipedia

Commodore SX 64 with some Fix/Enhancement

February 15th, 2009 27 comments
SX64

Autopsy:

Description:

  • Country: USA
  • Most Common: USA/Europe
  • Rarity: Very rare
  • Year: 1983
  • Price: $995

Fix/Enhancement:

  • Added a Fan.
  • ASSY fix from Commodore.
  • I/O Fastloader fix.
  • Userport GND  fix.
  • Jiffy Kernel (C64/1541).

from Wikipedia:

The Commodore SX-64, also known as the Executive 64, or VIP-64 in Europe, was a portable, briefcase/suitcase-size “luggable” version of the popular Commodore 64 home computer and holds the distinction of being the first full-color portable computer.

The SX-64 featured a built-in five-inch composite monitor and a built-in 1541 floppy drive. It weighed 23 lb (10.5 kg). The machine was carried by its sturdy handle, which doubled as an adjustable stand. It was announced in January 1983 and released a year later, at $995.

source: Wikipedia Oldcomputers

My old LPC Programmer (CheapLPC) for Xbox modchip

January 22nd, 2009 10 comments

The CheapLPC is a flashrom burner for the SST49LF020 chip, The Software can read back, and verify the contents of the chip.

The software is also compatible with any other CheapLPC based programmer, like that used in the Martrix by Xodus, Ozx Prog by OZx Modchips, Neurosys, and a few others.

Download: GreenProg (CheapLPC Programmer) v0.7 (428)

source: wikipedia cheaplpc.com

Sid Switcher (6581 <-> 8580)

November 15th, 2008 No comments

This is a project for switch from SID 6581 to SID 8580 and vice versa. This is not a SId2Sid Clone. This is a Switcher ;-D

source: 6581-Wiki

Pong from Polistil (1979) with AV output.

November 6th, 2008 1 comment

Here’s the Pong in a chip from Polistil (1979) with the Famous chip TMS1965 (GI AY-3-8500 pins compatibile) from Texas Instruments.

have added a Composite Video / Audio output  intested of VHF antenna output.

wiki: Pong-Wiki

DTV (c64) Yellow Box *updated*

October 21st, 2008 4 comments

Stay on Photo for a short description.

This is my Dtv (c64) Modded. Missing only one thing, the sd2iec (floppy drive 1541 emulator).

Features:

  • PS/2 keyboard connector.
  • External IEC connector.
  • 2 joystick ports with switchable reset line for dtvtrans.
  • 5V power regulator.
  • Switch for external/internal battery power.
  • Switch Power On/Off.
  • Shadowolf’s Keyboard Twister.
  • Floppy Drive Reset.
  • Commodore 64 Reset.
  • Spiff Color Fix.
  • FlashRom Fix (write enabled)

Video:

Homebrew UV Eprom Eraser

September 27th, 2008 No comments

My homebrew UV Eprom Eraser. I have spent 8 euros for electrical components and 3 euro for the box.

Gallery:

xAD’s Commodore 64 Modding

September 23rd, 2008 2 comments

This is my latest Commodore 64 Modding

Stay on Photo for a short description.