I thank a friend for the donation.
Donated item:
Sorry, this entry is only available in Italian.
Autopsy:
This computer/console in good cosmetic condition is arrived for a repair from a friend a few weeks ago. The defect is The Black Screen of Death, the computer turns on but doesn’t turn off, the standby LED remains faint green.
Unfortunately after several hours spent to trying the fault and i have tried just everything, the computer is still dead, my suspicion falls on the Custom Chip “SCOTCH” IX 1267CE from Sharp.
Components that have been tested and replaced:
Download: Sharp X68000 Schematics (1625)
from Wikipedia:
The Sharp X68000, often referred to as the X68k, is a home computer released only in Japan by the Sharp Corporation. The first model was released in 1987, with a 10 MHz Motorola 68000 CPU (hence the name), 1 MB of RAM and no hard drive; the last model was released in 1993 with a 25 MHz Motorola 68030 CPU, 4 MB of RAM and optional 80 MB SCSI hard drive. RAM in these systems is expandable to 12 MB, though most games and applications did not require more than two.
The X68k ran an operating system developed for Sharp by Hudson Soft, called Human68k, which features commands very similar to those in MS-DOS (typed in English). Pre-2.0 versions of the OS had command line output only for common utilities like “format” and “switch”, while later versions included forms-based versions of these utilities, greatly improving their usability. At least three major versions of the OS were released, with several updates in between. Other operating systems available include NetBSD for X68030 and OS-9.
Early models had a GUI called “VS” (Visual Shell); later ones were packaged with SX-WINDOW. A third GUI called Ko-Windows existed; its interface is similar to Motif. These GUI shells could be booted from floppy disk or the system’s hard drive. Most games also booted and ran from floppy disk; some were hard disk installable and others require hard disk installation.
Since the system’s release, Human68k, console, and SX-Window C compiler suites and BIOS ROMs have been released as public domain and are freely available for download.
Early machines use the rare Shugart Associates System Interface (SASI) for the hard disk interface; later versions adopted the industry-standard small computer system interface (SCSI). Per the hardware’s capability, formatted SASI drives can be 10, 20 or 30 MB in size and can be logically partitioned as well. Floppy disks came in a couple of different formats, none of which are natively readable on other platforms, although software exists that can read and write these disks on a DOS or Windows 98 PC.
source: wikipedia
I have received these computers to be repaired for a friend.
Defects found on the Commodore VIC-20:
Defects found on the Commodore 64:
The repair of the Commodore VIC-20 was made by replacing a HEX Inverter Buffer 7406.
The repair of the Commodore C64 was made by replacing the MOS 906114-01 (PLA – Programmable Logic Array).
Gallery of repairs:
This is the official demo party results from Stary Piernik 8 (Top 3 Entries only). See also the CSDB Stary Piernik 8 section for more informations and download.
C64 Demo:
C64 Music:
C64 Graphics:
Download: Stary Piernik 8 full Party stuff (1066)
source: noname.c64.org/csdb/
Thanks go to: Damiano (manosoft) and my Brother Alessandro.
Things that have been donated:
Autopsy:
Finally i have replaced my old and inaccurate Capacitor tester with a better one. My lab is beginning to have a semblance semi professional ;-D
Download: Peak Atlas ESR+ 70 User Guide (1384)
Video Review:
Mentor Colour 6 (Pong clone) has been Repaired
Defects:
The problem of the power supply has been fixed by replacing the transitor CS 9013 that is used in a very bizarre way to lower the voltage from 9v to 6.85v. The problem of the audio was always caused by a transistor CS 9013 brutally in short circuit. In this case, the transistor is used like a amplifier.
The transistor CS 9013 can be replaced with a BC 337 that it’s equivalent.
I thank a friend for the donation.
Donated item:
The HxC Floppy Drive Emulator is a software and hardware system created by jfdn aka Jeff.
The aim of this project is to replace the floppy disk drive by an electronic device emulating the floppy disk drive (list of supported Computer/Hardware).
There are two differents emulators:
Changelog SD HxCFloppyEmulator v1.8.2.40 (fat) & v2.1.2.40 (slim):
Download:
source: hxc2001.free.fr
This gallery shows some stages of the cleaning and repairing the Commodore CBM 610.
Defects found on the Commodore CBM 610:
The black screen of death was fixed by replacing the CPU MOS 6509A and the problem of garbage characters on the screen was fixed by replacing the ROM characters with a EPROM 2532 suitably programmed.
The yellowed keyboard was replaced with a new one in good condition of the Commodore CBM 710. I like Commodore. What will be the difference of a CBM 710 and a CBM 610 keyboard? nothing, are the same! no! on the keyboard of the CBM 710 has two wires reversed! (brown/red) ;-D
The filter capacitor exploded has been removed.
This gallery shows some stages of the repairing of the two Floppy Drives Commodore SFD-1001.
Defects found on the two Floppy Drives:
The difficulty was rebuild the tracks of the pcb and remove the most of the leaked acid of the capacitors. Unfortunately on the aesthetic level this type of repair are not perfect, but i’m glad that now work.
To test the correct operation of the Floppy Drives i have used a Commodore CBM (PET) 2001, and a Commodore CBM 610.
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:
Download:
source: hoxs64.net
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:
Download:
source: hoxs64.net
Attitude is a disk magazine for the Commodore 64 computer by Triad. We hope you enjoy this issue as much as you did the previous ones!
Download: Attitude Diskmagazine #14 (1180)
source: noname.c64.org
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