Category Archives: RetroChallenge

RC2016/10 success? Failure? I’m not sure.

As seems to be usual, my stated plans for Retrochallenge didn’t come to fruition.  Several times I’ve planned to do vector graphics stuff, and not done it, so this time I planned to do something else, USB bubble memory. Of … Continue reading

Posted in RetroChallenge | Leave a comment

Vector display working!

Some years ago I obtained a few Data Check 5045 digital vector displays from HSC Electronic Supply. Data Check bought the product line from HP, where this model had been the HP 1345A. HP used these in some of their … Continue reading

Posted in RetroChallenge | Leave a comment

Vector display!

Some years ago I obtained a few Data Check 5045 digital vector displays from HSC Electronic Supply. Data Check bought the product line from HP, where it had been the 1345A. HP used these in some of their own test … Continue reading

Posted in RetroChallenge | Leave a comment

Power supplies, connectors, fan, etc.

I’ve made a small amount of progress on the code, but nothing particularly noteworthy. I’ve given some thought to the design of a 3D-printable enclosure. I’m not sure whether I’ll end up needing a fan. I’ll put ventilation holes in … Continue reading

Posted in RetroChallenge | Leave a comment

More GPIO fixes; changed EPI code for two chip selects

My GPIO fix for pin numbers vs. masks needed to be made in a few more places, so I’ve done that now. The Intel D7220-1, like many peripheral chips, uses a chip select input (CS) for programmed I/O, but a … Continue reading

Posted in RetroChallenge | Leave a comment

Fixed the LED and USB problem

In a GPIO initialization function I’d written, I was passing a pin number as an argument to a vendor function that expected a mask. Changed it to 1 << pin, fixing both the LED and USB problems. Windows 10 isn’t … Continue reading

Posted in RetroChallenge | Leave a comment

GPIO, USB problems

I’ve continued working on the firmware, and have run into two problems: I can only turn on one of the four LEDs on the Tiva board. The other three obstinately remain off. I don’t really need any LEDs, but this … Continue reading

Posted in RetroChallenge | Leave a comment

Started writing firmware for USB bubble memory interface

I’ve started writing the firmware for my Retrochallenge project. For the USB to bubble memory interface, I’m using a Texas Instruments EK-TM4C1294XL “Tiva™ C Series TM4C1294 Connected LaunchPad Evaluation Kit”, which is based on the Tiva TM4C1294NCPDT microcontroller. This has a … Continue reading

Posted in RetroChallenge | Leave a comment

RC2016/10 entry

For the RC2016/10 RetroChallenge, my project is to interface some bubble memory to USB, to act as a very low capacity drive. Bubble memory is the future of non-volatile memory.  Or rather, it was the future of non-volatile memory from … Continue reading

Posted in RetroChallenge | Leave a comment

A change of plans

Due to unforeseen circumstances, I have a shift in focus for the RetroChallenge project. While I may yet do some vector graphics work as previously intended, for the first half of the RetroChallenge I’ve been busy writing VHDL code to … Continue reading

Posted in RetroChallenge | Leave a comment