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 (970)

source: csdb.dk

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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

Some Commodore 64 in bad state (not working) for Spare Parts.

Javatari is a multiplayer Atari 2600 emulator written in pure Java with no external libs.

Features:

• Client-Server multiplayer mode. Runs great in low-latency networks such as LANs.
• Drag&Drop and Copy&Paste of ROM files or URLs. Very easy to try ROMs from websites!
• Scanlines and TV screen emulation modes.
• Real Atari console user interface.

Changelog;

• Applets can now be detached from the browser window.
• Once detached, all features are available including Full Screen.
• Full Screen is now multi-monitor aware.
• Updated, cleaner looks.

Download: Javatari JAR v3.30 (Needs Java 6) (982)

source: javatari.org

This power supply for the REU 1764 is arrived for repair destroyed, the internal transformer was completely extirpated from the pcb.

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This is a clone of the famous Kupke Golem RAM Box for Commodore Amiga 1000.

The Kupke Golem RAM Box was very expensive at the time but it was also one of the few memory expansions with a pass through for the Commodore Amiga 1000.

source: amiga.resource.cx

I have disabled the mod to make the screen in reverse (white chars on black background), i have also made the composite mod with the right resistor value for the best quality video output.

Autopsy:

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Donated By: Andrea Pierdomenico

Mini Floppy Disk Drive for the Sharp PC-5000 (compatible MZ-800 through the interface MZ-1E05)

The Sharp Mini Floppy Disk Drive CE-510F is a double-density, double-sided 5 1/4 unit with a capacity of 320K per disk. The drive, of course, must be operated with AC power and is not portable.

The Sharp MZ-1E05 Interface is a Floppy Disk Card for MZ-700/MZ-800.

Download:

• Sharp MZ-1E05 Service Manual (1758)

Sharp MZ-800 Booting Disk Basic from Floppy Disk Drive:

Replacement:

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Simple steps to replace the keyboard Membrane of the Sinclair ZX Spectrum 128k (heatsink).

• Buy a new Sinclair Spectrum 128k Keyboard membrane.
• Unscrew the eight screws on the bottom.
• Kindly disconnect the keyboard from the connectors on the main pcb.
• Remove the back of the keyboard.
• Unscrew the block that holds the cable.
• Remove the old membrane.
• Clean the keyboard with air-spray and a soft brush.
• Install the new membrane.
• Close the back of the keyboard.
• Very kindly put the block of the flat cable and screw in.
• The keyboard is ready to be connected.
• Very kindly insert the flat cable into the connector.
• Your Sinclair ZX Spectrum 128k is like new.

source: rwapsoftware.co.uk