I have received this motherboard of a CBM 8032 to repair from Rossano T.

The motherboard was devastated by rust, many components are short-circuited due to rust that was abundant on the pins side of the chip. Unfortunately the computer was turned on to test it, causing the total breakdown of more components.

I have installed 40 socket because some components are rusty other are dead, however some traces under the chips are eaten by rust and and i had to rebuild.

The repair and cleaning took me a very long time and a lot of patience, it took me about 10+ hours.

Components Replaced:

• 1 x 4650 (6845P) CRT Controller
• 3 x 4116 RAM
• 2 x 2114 Video RAM
• 5 x 74LS244
• 3 x 74LS74
• 1 x 74LS02
• 1 x 1uf 100v Capacitor

Phases of the repair:

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Some new games (Cracked / Trained or Unrealeased) for Commodore 64 have been released from your favorites groups:  Alf Yngve, The New Dimension, Bad Taste, Really Proud Lamers, Antarctica, The Hidden Farts, Genesis Project, Laxity and TRIAD.

Download:

• Bank Run (927)
• gPng v1 (939)
• Ann Gong +3HD (981)
• Hit the Brick +1ED (951)
• Axiens HS (979)
• MArkanoid +4HD 101% (986)
• Dot Gobbler +1D (971)
• Trance Sector CE +8HD [pal/ntsc] (957)
• Radar Simulation +D (1103)
• Guns \'n\' Ghosts +9MD 101% (1101)
• All Games in One Archive (2500)

source: csdb.dk

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This gallery shows some stages of cleaning the computer Apple IIe and the Apple Monitor ///.

I have also made minor repairs which i describe below:

• Fixing the keyboard connector on keyboard side (some keys not working)
• Adjusting the yoke of the CRT tube (the screen is lightly rotated)
• Replaced the LED of power-on (CR1) of the Apple IIe (LED was off)
• Removing the RIFA filter capacitor (the capacitor was exploded)

Autopsy:

from Wikipedia:

The Apple Monitor /// was a green phosphor CRT-based monochrome monitor manufactured by Apple Computer for the Apple III personal computer, introduced in 1980.

As Apple’s first monitor in their business line of machines, it preceded the Apple Monitor II by several years. The Apple Monitor ///’s main feature was the coating on the CRT to reduce glare. The Apple Monitor /// was also compatible with the Apple II+, Apple IIe, Apple IIc, and even the later models: the Apple IIc+, and the Apple IIgs through its composite video output jack.

source: wikipedia

Autopsy:

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from Wikipedia:

The Disk II Floppy Disk Subsystem, often spelled as Disk ][, was a 5¼-inch floppy disk drive designed by Steve Wozniak and manufactured by Apple Computer. It was first introduced in 1978 at a retail price of US$495 for pre-order; it was later sold for $595 including the controller card (which can control up to two drives) and cable. The Disk II was designed specifically for use with the Apple II personal computer family to replace the slower cassette tape storage and cannot be used with any Macintosh computer without an Apple IIe Card as doing so will damage the drive and/or controller.

Apple produced at least six variants of the basic 5¼-inch Disk II concept over the course of the Apple II series’ lifetime: The Disk II, the Disk III, the DuoDisk, the Disk IIc, the UniDisk 5.25″ and the Apple 5.25 Drive. While all of these drives look different and they use four different connector types, they’re all electronically extremely similar, can all use the same low-level disk format, and are all interchangeable with the use of simple adapters, consisting of no more than two plugs and some wires between them. Most DuoDisk drives, the Disk IIc, the UniDisk 5.25″ and the AppleDisk 5.25″ even use the same 19-pin D-Sub connector, so they are directly interchangeable. The only 5.25″ drive Apple sold aside from the Disk II family was a 360k MFM unit made to allow Mac IIs and SEs to read PC floppy disks.

This is not the case with Apple’s 3.5″ drives, which use several different disk formats and several different interfaces, electronically quite dissimilar even in models using the same connector, and are not generally interchangeable.

source: wikipedia

Autopsy:

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from Wikipedia:

The Apple IIe (styled as Apple //e) is the third model in the Apple II series of personal computers produced by Apple Computer. The e in the name stands for enhanced, referring to the fact that several popular features were now built-in that were only available as upgrades and add-ons in earlier models. It also improved upon expandability and added a few new features, which, all combined, made it very attractive to first-time computer shoppers as a general-purpose machine. The Apple IIe has the distinction of being the longest-lived computer in Apple’s history, having been manufactured and sold for nearly 11 years with relatively few changes.

Apple had planned to retire the Apple II series after the introduction of the Apple III in 1980; after that machine turned out to be a disastrous failure, management decided the further continuation of the Apple II was in the company’s best interest. So after three and a half years at a stand-still, came the introduction of a new Apple II model — the Apple IIe (codenamed “Diana” and “Super II”). The Apple IIe was released in January 1983, the successor to the Apple II Plus. Some of the hardware and software features of the Apple III were borrowed in the design of the Apple IIe. The culmination of these changes led to increased sales and greater market share of both home and small business use.

One of the most notable improvements of the Apple IIe is the addition of a full ASCII character set and keyboard. The most important addition is the ability to input and display lower-case letters. Other keyboard improvements include four-way cursor control and standard editing keys (Delete and Tab), two special Apple modifier keys (Open and Solid Apple), and a safe off-to-side relocation of the “Reset” key. The auto-repeat function (any key held down to repeat same character continuously) is now automatic, no longer requiring the “REPT” key (now gone) found on the previous model’s keyboard.

source: wikipedia

SID Duzz it, it’s a SID Music Editor by Geir Tjelta of SHAPE.

Download: SID Duzz It v2.1.6 (949)

source: csdb.dk

Autopsy:

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Donated By: Andrea Pierdomenico

from The Personal Computer Museum:

The PowerPad is Chalkboard’s graphics tablet. With its combination of features, reasonable price, friendly support, and wide range of software, it would be an excellent addition to your hardware.

The first thing you notice about the PowerPad is that it’s big: it measures 17 inches by 14 inches, with a drawing surface 12 inches square. It is easier to draw on than the smaller surfaces of other tablets.

The PowerPad uses 14,400 tiny digital switches to read where pressure is applied to the pad. There are 10 x 10 per inch. Unlike the surfaces of other pads, the PowerPad has no problem resolving simultaneous multiple inputs. This ability allows the PowerPad to be used as much more than just a graphics tablet: it becomes a flexible input device.

If you’ve done a little arithmetic, you may be wondering about the PowerPad’s resolution. Ten switches per inch by 12 inches equals 120 points, or pixels – not even as high resolutions as Graphics 7! However, it’s possible to design a program using the Atari’s highest-resolution screen, by “software stretching” of the resolution.

The version of Micro Illustrator ($49.45) for the PowerPad has a special feature called “Scale” that uses ,Software stretching” to let you draw pixel by pixel, even though the tablet’s resolution isn’t as high as Micro Illustrator’s.

Hardware isn’t of much use without software, but the PowerPad doesn’t come with any. However, Chalkboard offers several programs in cartridges requiring 32K of RAM for the Commodore VIC-20.

source: pcmuseum.ca

Regenerator is an interactive disassembler for C64 binaries. Regenerator will load any standard C64 .PRG file (or VICE snapshot) and disassemble it for your convenience.

There are a few options you can choose to change the output and a few tools to make the output look better and more useful to programmers. Regenerator runs under M$ windows and need .net 3.5 (or 4.0) runtime.

New in version 1.3:

• Added REMOVE command to remove part of the data from dissasembly.
• Added EDIT BLOCKS window to Edit all the DATA, TEXT and REMOVED blocks manually.
• Added COPY to Clipboard functionality (insert key) with FULL or CODE only modes.
• Added possibility to add user-defined COMMENTS to the code. This can be done as a FULL line comment or as a SIDE comment!
• Added USER LABELS – you can now add a label to any address and it will be used in the disasembly. If there should be an automatic label generated for it then it will be overriden. Also added USER LABELS editor which is part of the old Label Prefixes window. You can add/edit and remove user labels within this screen and have a general overview of the user labels.
• Added high and low partial references to immediate opcodes. This means that code like LDX #$A0 STX smwhr LDX #$BB STX smwhr+1 will be disasembled as LDX #<pBBA0 STX smwhr LDX #>address STX smwhr+1. This includes loads and stores in different order and with different registers. There is also a context menu command that lets you disable this on a currently selected address (if auto creation fails). NOTE: excluded address in STA opcodes will not be generated like this!
• Fixed the Add BLANK LINE and Remove BLANK LINE so it actually works as it should.

Download: Regenerator disassembler v1.3 (937)

source: csdb.dk

Autopsy:

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from Segaretro homepage:

The SC-3000 (Sega Computer 3000) is the first and only computer to be designed and manufactured by Sega. It was first released in July of 1983 in Japan, and serves as the home computer equivalent of the SG-1000 cartridge-based video game console. The SC-3000, often known simply as the “Sega Computer” or even just the “Sega”, is an 8-bit home computer almost identical in nature to the SG-1000, but with a built-in keyboard and support for more hardware expansions.

Unlike later Sega systems, the SC-3000 did not receive a worldwide release, but in markets were it did compete, including Japan, Australia, New Zealand, France, Italy and Finland, the computer fared well as a low price, entry-level machine for the home. By 1985 the SC-3000 had been displaced by more popular computer standards, but is nevertheless said to have fared better than the SG-1000 console on the global stage, and has a strong group of followers to this day.

The SC-3000 was also Sega’s last home computer to be released to the general public. The company would partner with Amstrad and IBM for the Amstrad Mega PC and TeraDrive respectively in later years, but other endeavours such as the extremely rare Sega AI Computer saw only a small fraction of the success the SC-3000 received, and were built with very different aims.

source: segaretro.org/SC-3000

Merging between two  Amstrad 464+ partially functionals to make it one fully functional and in a decent aesthetic state.

This computer was in very poor condition, almost all the traces and pitches on the Z80 CPU side was interrupted.

I had to remove the old socket and install a new one and rebuild all traces/pitches interrupted.

This Arcade Game had a problem on the audio stage (no audio).

The problem was caused by a tantalum capacitor exploded, i don’t have found a schematic of this game then i have replaced the filter capacitor for the 12 volts of the final amplification stage with a new one of 1uF 100v.

Irem Kung-Fu Master Arcade Game:

The failure was due to a cold solder on the ram socket and a bent pin on the ic MOS 8276.

Autopsy:

Donated By: Andrea Pierdomenico

from Wikipedia:

Commodore’s RAM Expansion Unit (REU) range of external RAM add-ons for their Commodore 64/128 home computers was announced at the same time as the C128. The REUs came in three models, initially the 1700 (128 KB) and 1750 (512 kB), and later the 1764 (256 kB, for the C64).

Although the C128 could access more than 64 kB of RAM through bank switching, the memory inside the REU could only be accessed by memory-transfers (STORE/LOAD/SWAP/COMPAREs) between the main memory and the REU memory, thus, giving an equivalent to a (slow) small memory window. Additionally, the C128′s built-in BASIC 7.0 had three statements, STASH,FETCH, and SWAP, for storing and retrieving data from the REU.

Officially, only the 1700 and 1750 were supported on the C128. The 256 kB model, the 1764, was released for the C64 at the same time. However, aside from a bundled 2.5 ampere C64 power supply unit (the factory unit could not support the 1764), there were only minor differences between the three models.

In practice, the difference between the 1764 and the earlier units had little effect on compatibility, and people used 1700s and 1750s successfully with the C64, and 1764s successfully with the C128, although the C64′s stock power supply was inadequate to reliably handle the power load of any of them. Some dealers unbundled the 1764 and the power supply in order to sell the power supply to C64 users, and/or upgrade the 1764 to 512 kB.

Because of memory chip shortages in the late 1980s, the 1750 was only produced in small quantities. However it was not difficult to upgrade a 1700 or 1764 to 512 kB. Several firms did this commercially, either selling upgraded units or upgrading customer-supplied units.

In the early 1990s, DIY modification schemes to increase the capacity of an REU to one megabyte or higher appeared on various online services.

source: wikipedia