Electronics

Retro-computer stuff:

• www.retroleum.co.uk – my webstore for Spectrum and Commodore 64 Spares

ZX Spectrum:

• Repairing a ZX Spectrum
• Nebula – A Spectrum ULA replacement board
• Retroleum SMART Card for ZX Spectrum – A low cost game loader (and more!)
• Re-capping the Spectrum
• A Diagnostic Test ROM for the Spectrum
• Some notes regarding problems when loading games from tape
• Issue 2 PCB modifications
• How to replace a (faulty) Spectrum ROM with an EPROM.
• Composite Video Mods
• Problems with replacement Spectrum Plus Membranes
• How to restore the white ZX Spectrum logo (well one way, at least:)
• RAM types in the Spectrum

Commodore 64:

• Quick fault-finding guide
• Commodore 64 – Restoration etc.
• C64 Keyboard information / repair

My Z80 Computer Project:

• The evolution of my homebrew Z80-based computer V1Z80P to V6Z80P (and eZ80P)

Random Utils:

• SPILEP 25x series Large EEPROM Programmer
• Binary file to .asm converter (for annoying assemblers that dont have an incbin directive)

Random Articles:

• PAL TV timing and voltage information
• How to develop and etch your own PCBs
• The Ubicom SX28 microcontroller
• Intro to CPLDs – Complex Programmable Logic Devices
• Configuring a Xilinx Spartan 2 FPGA with PIC and serial eeprom
• Using the PSone LCD screen for your own projects
• Basic read/write sector access to MMC cards
• Description of an 8-bit IDE Interface

PIC stuff:

• 16F1829 PIC assembly code template
• Some simple PIC (16F627A) to HD44780 based LCD module demo code