Regeneration of the Keyboard PAD.

Some keys did not work properly. The Keyboard PAD have been regenerated using a suitable product that can be found for sale on eBay. Try: KEYPAD FIX

Gallery of the fix:

CBM prg Studio Version 3.5.0 is released. There are a lot of new features in this version. I’d really appreciate it if you report any bugs you find or have any suggestions/comments.

CBM prg Studio allows you to type a BASIC or Machine Code program in using a nice Windows environment and convert it to a ‘.prg’ file which you can run on an emulator, or even a real C64 / VIC20 or PET if you’re feeling brave and have the right kit.

CBM prg Studio is the result of merging C64PrgGen and VIC20PrgGen. Adding new features and fixing bugs in two apps which were 95% similar was a bit of a nightmare so merging them made sense.

It was also a good opportunity for a face lift and to add some new features, such as:

• Programs are project based, meaning all related source files, sprite files etc. are kept in one place and multiple source files can be linked more easily.
• Tabbed MDI.
• Syntax highlighting.

What CBM prg Studio isn’t is a front-end for tok64, cbmcnvrt, bastext or any other tokeniser / detokeniser / assembler. It’s all been written completely from scratch.

Improvements:

• Assembler:
  • Reporting of page boundary crossings for branching instructions.
  • Choose character set for TEXT directive.

• General:
  • Editing tools (Select to end/start of screen/doc etc.)
  • Comment blocks

• Debugger:
  • Show effective address of next instruction.

Bugs Fixed:

• Assembler:
  • Low of high byte of labels could fail.
  • Occasionally wrong target machine type with ‘generate and launch.’
  • Problems with a comment character after a comment character or in a string.
  • Problem with a label as a destination when the label is on the same line as the macro definition.
  • ‘Align’ incorrect when already on align boundary.

• Debugger:
  • Wrong return address shown.

• BASIC:
  • Statistics tool not coping with ‘rem’ in strings.

See the help for a complete list of new features and fixed bugs.

Note In this version, each target machine can have its own default project directory. If you are upgrading from a previous version (before version 2.5.1) of CBM prg Studio you may be asked to set up your project directories again. Your current projects will not be affected.

Download: CBM prg Studio v3.6.0 (1079)

source: ajordison.co.uk

The Commodore 2031 and Commodore 4031 are single-unit 5¼” floppy disk drives for Commodore International computers. They use a similar steel case form to the Commodore 9060/9090 hard disk drives, and use the IEEE-488 interface common to Commodore PET/CBM computers. Essentially, both models are a single-drive version of the Commodore 4040.

The Commodore 2031LP is functionally the same as the 2031, but used the lower-profile tan case of the second version of the Commodore 1541 floppy disk drive intended for home computer use.

These drive models use a single-density, single-side floppy data storage format similar to that used by the Commodore 1540 & Commodore 1541 drives, but with a slightly different data marker indicating which model originally formatted the disk. The low-level disk format is similar enough to allow reading between models, but different enough that one series of drive models cannot reliably write to disks formatted with one of the other model series. A different of one extra ‘header’ byte is what causes this write incompatibility.

Gallery:

Comparison Commodore Floppy Drive 2031 (Low Profile) & 2031 (High Profile):

Fix the Commodore Floppy Drive 2031 (High Profile)

Removed the filter capacitors RIFA in the power plug.

Download: Commodore Floppy Drive 2031LP/HP Rom (1296)

source: wikipedia

Like the Pig do not throw anything away.

Recovered components:

• 2 x KM416C254 (256K x 16Bit CMOS Dynamic RAM with Extended Data Out)
• 10 x KM48C2104 (2M x 8Bit CMOS Dynamic RAM with Extended Data Out)
• 5 x HYB514171 (256k x 16Bit Dynamic RAM)
• 2 x Piezo Buzzer
• 1 x NE556 (GENERAL PURPOSE DUAL BIPOLAR TIMERS)
• 1 x EZ1085CM (3.0 AMP POSITIVE VOLTAGE REGULATOR)

Gallery:

There is nothing simpler than burning the Kickstart ROM at home :D

Gallery:

Below you can download the Amiga Kickstart 3.1 rom already ready for programming, the only thing that you have to do is the “Byte Swap” with your programming EPROM software.

Download: Amiga 500/600/1200/2000/4000 Kickstart 3.1 ROM + Docs (688)

NOTE: Download REMOVED (DMCA infringement)

Replacing electrolytic capacitors Commodore Amiga 600/1200.

Gallery full Recap 2 x Commodore Amiga 1200:

Gallery full Recap 1 x Commodore Amiga 600:

All computers that i use for experiments or tests must at least be cleaned and disinfected.

Works that have been made:

• General and accurate cleaning.
• Accurate cleaning with a magnifying lens of the AMIGA logo with isopropyl alcohol. I have used also a toothpick to remove the black color from the corners.
• Full Recap of the motherboards.
• Removed the two pieces of metal.
• Fixed the RGB video connector (totally broken).
• Replaced the keyboard with another one less yellowed.
• Added a Gotek Floppy Drive with HXC Firmware.
• Kickstart ROM 3.1.

Photo gallery before cleaning:

Photo gallery after cleaning:

Repair Motherboard (ASSY 326298) Drean Commodore 64

Defect:

• Black Screen.
• Missing Video Signal.

Cause of the Missing Video Signal:

• The motherboard of this C64 to work with the PAL-N video (Argentina) has been modified. Some pcb tracks are cut off and the modulator has been replaced. There are also a few bridges to retrieve the S-VIDEO output (luma / chroma).

Video Restoration:

• I have made a bridge with a wire for recover the composite signal that has been removed (tiny blue wire).

Repair:

• The cause of the black screen are 2 x MK 4564 ram in short circuit.

Photo gallery of repair:

The Commodore 2031 and Commodore 4031 are single-unit 5¼” floppy disk drives for Commodore International computers. They use a similar steel case form to the Commodore 9060/9090 hard disk drives, and use the IEEE-488 interface common to Commodore PET/CBM computers. Essentially, both models are a single-drive version of the Commodore 4040.

The Commodore 2031LP is functionally the same as the 2031, but used the lower-profile tan case of the second version of the Commodore 1541 floppy disk drive intended for home computer use.

These drive models use a single-density, single-side floppy data storage format similar to that used by the Commodore 1540 & Commodore 1541 drives, but with a slightly different data marker indicating which model originally formatted the disk. The low-level disk format is similar enough to allow reading between models, but different enough that one series of drive models cannot reliably write to disks formatted with one of the other model series. A different of one extra ‘header’ byte is what causes this write incompatibility.

Gallery:

Repair/Restoration Commodore Floppy Drive 2031LP

Defect:

• Lock lever of the Floppy Drive broken.
• When the Floppy Drive is powered up, red LED stays on and spindle motor runs continuously.

Repair/Restoration:

• Replaced the Lock lever with a new one taken from a Commodore Floppy Drive 1541 (spare parts)
• Replaced the ROM (UAB5 901484-05) with a EPROM MCM 68766 supplied from my friend Giacomo Vernoni.

Note:

The Eprom programming was done with a EPROM programmer Promenade by Jason-Ranheim Co. for Commodore 64.

Repair/Restoration Gallery:

Download: Commodore Floppy Drive 2031LP/HP Rom (1296)

source: wikipedia

Sorry, this entry is only available in Italian.

The Home Computer Asem AM 100 is a clone of the Apple II+ (Apple // Plus). This computer was manufactured and assembled by ASEM S.p.A. Artegna (UD) / Italy.

The AM 100 is fully compatible with all the software available for the Apple II and II+. I have personally tested many programs and i’ve never found problems of compatibility.

Unfortunately this computer is arrived faulty, the repair was more simple than i expected, thanks to the IC sockets located on the computer motherboard.

Works that have been made:

• Replacing IC 74LS161 which shows a vertical band on the screen.
• Removing RIFA filter capacitor located inside the PSU.
• Regeneration of the Keyboard PAD. Some keys did not work properly. The Keyboard PAD have been regenerated using a suitable product that can be found for sale on eBay. Try: KEYPAD FIX
• General cleaning of the case outside/inside, monitor and keyboard.
• EPROM dump.

All these works are documented with photos that you can find below.

Gallery repairs:

12►

Under the cover gallery:

12►

Final photos:

Interesting discovery:

Inside the Floppy Drive reader (Apple clone) i have found the same mechanics (Mistumi / Newtronics) of the Commodore Floppy Drive 1541. See the first three pictures of the gallery: Under the cover.

Download: ASEM AM 100 full Eprom Dump (1309)