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Welcome to the blog section of my website. Here you'll find my mostly useless information on various retro gaming computers and consoles and a few other hobbies…

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Commodore C64 DTV Hacking2023/01/31 11:29John

Pages which have been added most recently:

DTV (and C64) Programming - Using the CC65 toolchain

From Wikipedia:

The C64 Direct-to-TV, called C64DTV for short, is a single-chip implementation of the Commodore 64 computer, contained in a joystick (modeled after the mid-1980s Competition Pro
joystick), with 30 built-in games. The design is similar to the Atari Classics 10-in-1 TV Game. The circuitry of the C64DTV was designed by Jeri Ellsworth, a computer chip designer who
had previously designed the C-One.

These are my notes on programming for the C64 DTV and making use of some of the extended functionality of the hardware from within C, rather than 6502 assembly. I hope you find these useful - whilst I came to the DTV more than a decade after its popularity peaked, I've found it a very capable little system!

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2023/01/22 10:14 · john

Commodore C64 DTV Hacking

From Wikipedia:

The C64 Direct-to-TV, called C64DTV for short, is a single-chip implementation of the Commodore 64 computer, contained in a joystick (modeled after the mid-1980s Competition Pro
joystick), with 30 built-in games. The design is similar to the Atari Classics 10-in-1 TV Game. The circuitry of the C64DTV was designed by Jeri Ellsworth, a computer chip designer who
had previously designed the C-One.

These are my notes on converting the C64 DTV into a capable, full-featured 8bit computer system. I've written these notes down since a lot of the information on the C64 DTV has been lost over the years. This is a combination of the old web pages I've found, technical specs and my own findings/diagrams used to build my own C64 DTV Computer System.

Firstly, there are some key things to look out for with the different versions of the DTV:

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2023/01/16 10:53 · john

Tulip Vision Line DT 5/166

This is a fairly compact desktop-configuration system I bought in December 2022 from a seller on Ebay that deals in vintage PC equipment.

The case was pretty dirty when it arrived, but a little bit of soap and water and a magic eraser and it came up looking lovely:

Motherboard is a compact design with a shared ISA/PCI riser, and is based on the very common Intel Triton II chipset (i430VX) with lot of integrated peripherals (dual channel PCI IDE controller, Alliance ProMotion PCI VGA, AMD PCNet 10mbit ethernet):

Apparently there are multiple revisions of this motherboard with some having dual-voltage processor support, some having S3 VGA and optional sound support. Mine unfortunately is an early model without any of those options.

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2023/01/15 12:14 · john

Digipos Pro

This is a point-of-sale system which I bought as non-working in December 2022. It was listed as powering on, but displayed no output and output a number of beep error codes. The problem turned out to be relatively easy to fix - the included single 16MB SIMM module was either faulty or incompatible and after replacing it with two 32MB EDO SIMM's from my spares it powered on correctly.

Case Pictures

Internals

Motherboard

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2023/01/13 10:42 · john

DOS - Modern Development Tools

This is my page which collects links/information on various modern development tools and languages for writing new code on old PC/IBM/DOS systems.

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2022/12/23 15:58 · john
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