This gallery shows some stages of the cleaning and repairing the Commodore CBM 610.

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Defects found on the Commodore CBM 610:

• Black Screen of Death.
• Garbage characters on the screen.
• Keyboard Yellowed.
• Filter capacitor exploded.

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.

Autopsy:

123►

from Wikipedia:

The Commodore CBM-II series was a short-lived range of 8-bit personal computers from Commodore Business Machines (CBM), released in 1982 and intended as a follow-on to the Commodore PET series.

The CBM-II had two incarnations, the P series (P = personal, or, home use) and the B series (B = business use). The B series was available with a built-in monochrome monitor (hi-profile) with detached keyboard, and also as a single unit with built-in keyboard but no monitor (lo-profile). These machines were known as the “Porsche PETs” for their unique styling.

The P series used the VIC-II 40-column color video chip like the C64. It also included two standard Atari-style joystick ports. The 6509 CPU ran at 1 MHz in the P series due to the use of the VIC-II chip.

The B series used a 6545 CRTC video chip to give an 80-column “green screen” monochrome output more suitable for word processing and other business use than the VIC-II’s 40-column display. Most models have the Motorola 68B45 installed which is a pin compatible variant rather than the MOS 6545A1 2 MHz part. On the B series the 6509 CPU ran at 2 MHz.

Features common to both the P and B series included an MOS Technology 6509 CPU, an enhanced version of the venerable 6502, that was capable of addressing up to 1 megabyte of RAM via bank switching (however, no CBM-II model came with more than 256 kilobytes of RAM, 1/4 megabyte). The sound chip was the 6581 SID, the same one that was used in the popular Commodore 64 (C64) but with some limitations as it was over-clocked to 2 MHz. Additionally, the CBM-II had an industry-standard RS-232 serial interface and an IEEE-488 parallel bus (for use by disk drives and printers) just like the PET/CBM series. The CBM-II’s built-in operating system used an enhanced version of CBM BASIC version 4.0.

An optional Intel 8088-based coprocessor board allowed the CBM-II series to run CP/M-86 1.1 and MS-DOS 1.25; however, the computers were not IBM PC compatible and very little, if any, software taking advantage of this capability ever appeared. The coprocessor board only ran on hi-profile machines due to power supply and mechanical spacing requirements.

The production naming within the United States and Canada was the B128/B256 and CBM128-80/CBM 256-80 while in Europe they were known as the 600 and 700 series respectively (no “B” in front of the model number). The P machine was known worldwide as the 500 series. There are prototype models though such as the B500 (earlier B128 design) and B700 (earlier CBM 128-80/CBM 256-80 design) known to exist.

Due to the popularity of the C64, the P series was cancelled in the United States before it could be officially released; however, a few dealers who received preproduction units sold them. As these computers had not received approval from the Federal Communications Commission, this caused legal problems for Commodore. The units were recalled and destroyed, but a very small number exist today, in private collections. At least one model, the P500, was commercially released in Europe but only sold in small numbers.

source: wikipedia

Autopsy:

The Memotech Memopack is a 16K RAM Expansion Pack for Sinclair ZX-81.

This version of the MEMOPAK 16K is fully compatible with either the Sinclair 16K or another MEMOPAK 16K; or a MEMOPAK 32K; or you can work with it just by itself.

TIPS: The default switches for the Master Position are: (Off, On, On, Off).

Download: Memotech Memopack Manual (1535)

This gallery shows some stages of the repairing of the two Floppy Drives Commodore SFD-1001.

12►

Defects found on the two Floppy Drives:

• Both floppy drives had the capacitors that leaked acid on the motor control pcb.
• Both floppy drives had the closing arm cracked.

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.

Autopsy:

12►

from C64-Wiki Homepage:

The Commodore disk drive SFD-1001 was build in 1984/85. It has got a storage capacity up to 1 MByte (1.066.496 bytes equals 4166 blocks, ca. 4100 useable) for 5,25″-disks and it has got a IEEE-488 interface.

The data transfer is parallel. Also it is 5-times faster (ca. 1500 bytes/s) than the floppy VIC-1541. It can also used on CBM-PETs and with the right connector (cartridge) on C64/128, too.

The disk drive has build in the Commodore-DOS 2.7 version.

Download: 8250LP (SFD-1001) Disk Drive Technical Manual (1574)

source: c64-wiki.com

Autopsy:

from MOS6502 Homepage:

The idea of running the multitude of CP/M software on your Commodore surely was one of the drivers for people to invest in the C128. But what about that obscure CP/M cartridge, containing of course the Z80 CPU (running at 3MHz), that Commodore released for the C64 in 1983?  Did this introduce CP/M for the classic Commodore computer?

At least in theory, the cartridge would open up the world of CP/M to the C64 user, but 1541 disk drive incompatibilities made it next to impossible to run CP/M software on the home computer.  A disk of, let’s say an Apple (CP/M) would simply not run and only produce a “Bad Track” or “Bad Sector” error.

Commodore quickly stopped manufacturing these cartridges and Commodore users had to wait till the C128 before they could really start playing around with CP/M So was the CP/M cartridge a complete waste?  Surely there would be some “proprietary” Commodore CP/M software for the C64? The answers are “no” and… “no”.

This may seem a bit contradictory but there was one neat little trick that you could do to actually run the CP/M programs out there and it didn’t involve the incompatible disk drive: you had to utilize the user port to transfer CP/M software from another machine… talk about some workaround!

Download: Cartridge Schematic & Manual (1597)

source: mos6502.com

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:

• Fixed an EasyFlash cartridge fault when loading a 4KB banked CRT file or state file.

Download:

• Hoxs64 64 bit v1.0.8.6 (879)
• Hoxs64 32 bit v1.0.8.6 (895)
• Hoxs64 Ansi Win98/2K v1.0.8.6 (900)

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:

• Added emulation state file save, load and restore facility.
• Added Epyx Fastload cartridge.
• Added screen border hide options.
• Fixed Retro Reply cartridge banking fault.
• Reworked the CPU code to accommodate XAA/ANE for a MOS8500 as reported by Visual6502.org

Download:

• Hoxs64 64 bit v1.0.8.5 (1173)
• Hoxs64 32 bit v1.0.8.5 (1165)
• Hoxs64 Ansi Win98/2K v1.0.8.5 (1216)

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 (1100)

source: noname.c64.org

Autopsy:

123►

I have received this computer to be repaired for a friend with a classic startup fault; the Black screen of Death.

After careful analysis of the problem and thanks to Alessandro Polito for the test, the failed component was the CPU 6509.

from Wikipedia:

The Commodore CBM-II series was a short-lived range of 8-bit personal computers from Commodore Business Machines (CBM), released in 1982 and intended as a follow-on to the Commodore PET series.

The CBM-II had two incarnations, the P series (P = personal, or, home use) and the B series (B = business use). The B series was available with a built-in monochrome monitor (hi-profile) with detached keyboard, and also as a single unit with built-in keyboard but no monitor (lo-profile). These machines were known as the “Porsche PETs” for their unique styling.

The P series used the VIC-II 40-column color video chip like the C64. It also included two standard Atari-style joystick ports. The 6509 CPU ran at 1 MHz in the P series due to the use of the VIC-II chip.

The B series used a 6545 CRTC video chip to give an 80-column “green screen” monochrome output more suitable for word processing and other business use than the VIC-II’s 40-column display. Most models have the Motorola 68B45 installed which is a pin compatible variant rather than the MOS 6545A1 2 MHz part. On the B series the 6509 CPU ran at 2 MHz.

Features common to both the P and B series included an MOS Technology 6509 CPU, an enhanced version of the venerable 6502, that was capable of addressing up to 1 megabyte of RAM via bank switching (however, no CBM-II model came with more than 256 kilobytes of RAM, 1/4 megabyte). The sound chip was the 6581 SID, the same one that was used in the popular Commodore 64 (C64) but with some limitations as it was over-clocked to 2 MHz. Additionally, the CBM-II had an industry-standard RS-232 serial interface and an IEEE-488 parallel bus (for use by disk drives and printers) just like the PET/CBM series. The CBM-II’s built-in operating system used an enhanced version of CBM BASIC version 4.0.

An optional Intel 8088-based coprocessor board allowed the CBM-II series to run CP/M-86 1.1 and MS-DOS 1.25; however, the computers were not IBM PC compatible and very little, if any, software taking advantage of this capability ever appeared. The coprocessor board only ran on hi-profile machines due to power supply and mechanical spacing requirements.

The production naming within the United States and Canada was the B128/B256 and CBM128-80/CBM 256-80 while in Europe they were known as the 600 and 700 series respectively (no “B” in front of the model number). The P machine was known worldwide as the 500 series. There are prototype models though such as the B500 (earlier B128 design) and B700 (earlier CBM 128-80/CBM 256-80 design) known to exist.

Due to the popularity of the C64, the P series was cancelled in the United States before it could be officially released; however, a few dealers who received preproduction units sold them. As these computers had not received approval from the Federal Communications Commission, this caused legal problems for Commodore. The units were recalled and destroyed, but a very small number exist today, in private collections. At least one model, the P500, was commercially released in Europe but only sold in small numbers.

source: wikipedia

FAIL is a viewer of pictures in native formats of Atari 8-bit, Atari ST, Atari Falcon and Atari Portfolio computers.

Currently the project includes:

• Fail2png – portable command-line converter to PNG files.
• FAILWin – viewer for Windows.
• Thumbnail providers for Windows Explorer and GNOME (Linux)
• Plugin for XnView.
• (de)coder for ImageMagick.
• Plugin for Imagine.
• HTML 5 based viewer.

Changelog:

• New formats: Interlace Character Editor font (ICE), GEM Bit Image (IMG), Multi Palette Picture (MPP).

This is the last release of FAIL. But don’t worry! We are just renaming our project to Retro Computer Image Library (RECOIL), because we are going to support formats from 8-bit and 16-bit machines other than Atari. Stay tuned!

Download: FAIL (First Atari Image Library) v2.0.2 (1564)

source: fail.sourceforge.net

Some new games or tools (Cracked / Trained or Unrealeased) for Commodore 64 have been released from your favorites groups.

Titles:

• Elidon +7DM
• Conway’s Game Of Life
• Harrier Strike +3
• Locomotive Preview
• Deep Star +4
• Codename Desert Storm +3
• Liberator Preview
• Mission Moon +2J 101%
• Megapede +DG
• Gigamaze +ED
• 911 Tiger Shark +2 [ntsc]
• Agent-X II +1DG
• Submarine Rescue +5
• Submarine Rescue
• Mission Moon
• Sheep vs. Fox DX +2H
• Job Race +2D
• Press It!
• Angry Birds Style
• Murray Mouse +26D
• Quod Init Exit v1.4
• Flin Flon
• Assembloids (Retail Version) +2HD

Download: All Games in One Archive (2580)

source: csdb.dk

Arc64 is a small tool to deal with D64, T64, LNX and ZipCode archives. It can be used to edit D64 images, run D64 images in the WinVice emulator, run
PRG files via CodeNet, convert T64, LNX, PRG, ZipCode and other formats to D64.

A key feature is the drag & drop support. If you drop a D64 image, it will be opened instead of the currently opened D64 image. If you drop any kind of other file, Arc64 will try to add it to the D64 image. Formats like T64, LNX and P00 will automatically extracted into the D64 image as PRGs.

Any changes to a D64 won’t be saved automatically, you either have to drag the header of the directory into an explorer window, or you have to use the
Save-option from the menus.

Download: Arc64 v2.5 by Graham of Arsenic,Oxyron (882)

source: csdb.dk

These two computers had the classic fault: Black screen of Death.

The first one was repaired by replacing a ram chip (4264) partially interrupted, the other one had One of the two chip PLA dead.

I have to thank my friend Andrea for providing me a motherboard of a 8296 for spare parts, where i have recovered the PLA which i needed.

Autopsy:

from CPCWiki:

The Amstrad (Schneider) CTM640/CTM644 are two colour monitors sold together with the classic CPC-computers. Optionally, the computer could have been purchased with GT64/GT65 green monitors. The only difference between the CTM640 and CTM644 models is the additional 12V power supply for the CPC664/CPC6128′s disk drive in the later model.

With the arrival of the CPC664 and CPC6128 models, the existing stock of CTM640 monitors was sold out and later only CTM644 monitors were sold, even with the CPC464. For that reason, the 12V power outlet was designed as a socket for a cable coming from the CPC, while all other connections were made with cables coming from the monitor.

Amstrad (Schneider) Colour Monitor CTM 644 demostration:

source: cpcwiki.eu