Give your RC2014 a MSX compatible Real time clock and MSX F4 Boot registerDesigned by Dino Boards in Australia
What is it? This kit, designed around the RP5C01 RTC chip, is part of the Yellow MSX series of modules to give your RC2014 MSX compatibility. It gives your RC2014 the ability to remember the date and…Read More…
This kit, designed around the RP5C01 RTC chip, is part of the Yellow MSX series of modules to give your RC2014 MSX compatibility.
It gives your RC2014 the ability to remember the date and time when power is off.
The RPC501 chip maintains a time/date counter and when the machine is switched off, the chip is powered by a coin CR2032 battery.
In addition to keeping time, it also has a small amount of onboard RAM, that is also powered by the battery when main power is off. This RAM can be used to store machine specific settings, such as boot screen color and mode.
* see RomWBW's dev branch
Detail of building, configuring, calibrating the board can be found on the github project page
To enable this capability, you need to bridge jumper J2 (RESET). Please see the notes on the github project regarding the RC2014 Dual Clock module's Reset on power function.
The trimmer capacitor can be use to adjust the onboard clock for calibrating timing accuracy. The MSX-DOS application
RTCCALB.COM (downloadable from the github project) can be used to show reference of the RTC to your CPU's clock
It is possible to synchronise the RTC via the ESP8266 to an internet synchronised clock. It requires the WIFI module and SIO/2 be linked via the 2nd serial channel. The
ESP8266.COM MSX-DOS application along with custom firmware for the ESP8266 are still under development. See the Hackaday project log for current status.
This is a single bit register at IO address $F4, that MSX software can use to identified if your machine was cold booted (powered on), or warm booted (reset). MSX Bios software will skip boot screen and other startup code on a warm boot.
These are a series of boards that I am developing to achieve MSX compatibility for RC2014 systems.
The idea is that you can build each board one at a time, test it and play with it under RomWBW - and then once you have the set - load up some MSX/MSX2+ games!
The first board in the series was the V9958 Video board
More details are available within the hackaday project
The ceramic capacitor value for the main clock should be 30pf, not 33pf.
With a 33pf, the clock will work but may run a little slow. Decreasing the capacitor's value will make the clock run a little faster.
Individual cases may vary, so the kit has been supplied with 27pf, 30pf and 33pf to allow for experimentation.
The full kits includes (PCB, passive components, IC and their sockets, including the RP5C01 chip)
The RP5C01 chip is an obsolete, no longer manufactured component. The chip supplied may be used or new-old-stock. I test each chip prior to shipping.
A battery is not included. Requires a standard coin CR2032 battery.
Please note that this is a kit, produced by a non-professional (me) for hackers, DIYers' and retro lovers, to tinker with. I will do my best to answer any support questions you may have.
The clock's timing should generally be adequate, but please don't expect super accurate time keeping.
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