Both of these pins are +12V on the Dragon computers. This is both ODD and INTERESTING because Pins 1 and 2 of that connector are -12V and +12V, respectively, on ALL CoCo 1's, TDP-100's and ALL Multi-Pak Interfaces. These "Interrupts", IRQ0* and IRQ1* appear to go, through disable jumpers, to Pins 1 and 2 of the CoCo Cartridge (Program PAK) Connector.
#Flexi 12 update series#
Starting with of the schematic, we see the expected cartridge (program pak) plug followed by an oddly interesting series of "purported" interrupts, labeled IRQ0* and IRQ1* (the "*" indicates low-level triggering, or active low). = ANALYSIS OF ORIGINAL DESIGN: Load up the "CC-FlexiMIDI-V1R0-.sch" schematic file and have it handy for this discussion.
#Flexi 12 update archive#
The original "CC-FlexiMIDI-V1R0-" design files, as provided by "Little John" and his father (J.R.) are contained in the "Original (Deprecated)" folder of this archive and should be referenced for this initial analysis of the design. As such, I will analyze "Little John's" original design and then provide my improved version. I, "Uncle" Robert "The R.A.T." Allen Turner, have decided to polish up the design a bit and lay out a manufacturable Printed Circuit Board which I will release under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License. It is a terrible design only because he knew nothing about circuit design at the time and it does not appear that his father, "Big John" (J.R.) offered any input in regards to this particular design. The "CC-FlexiMIDI-V1R0-" was among his very first (learning the art of circuit design) works. in order to design products for the TRS-80 Color Computer line of computers, with the help of his father, my brother, "Big John" or "J.R." as he is known to me. He was teaching himself to use E.A.G.L.E. The original "CC-FlexiMIDI-V1R0-" was designed by my nephew, "Little John", on March 8-9, 2009 as a learning excercise. = DESCRIPTION: This project is an updated version of the "CC-FlexiMIDI-V1R0-", a hardware MIDI Interface Card for the Tandy Radio Shack TRS-80 Color Computer 1,2 and 3, Dragon Data Dragon D32, D64 and D200, Tandy Data Products TDP-100, Tano Dragon 64 and other clones and compatibles.
#Flexi 12 update license#
Version 1, Revision 1 is Copyright (C) 2019 by the above mentioned parties and is released under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License on. Turner on May 21, 2019, just over ten years after the initial release of Version 1, Revision 0. CC-FlexiMIDI-V1R0- has been updated to CC-FlexiMIDI-V1R1- by R.A. ENJOY! Note that the original design is crap, however, a debugged version is forthcoming from "Uncle" Robert "The R.A.T." Allen Turner. Subsequently released under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License on. Originally released as Open-Source Hardware on March 9, 2009. Interface Program Pak Cartridge for the Tandy Radio Shack TRS-80 Color Computer 1, 2 and 3, including clones and compatibles (Tano Dragon 64, Dragon Data D32, D64 and D200, Tandy Data Products TDP-100, etcetera) by "Little" John Eric Turner and his father "Big" John Robert (J.R.) Turner. GitHub - TheLittleEngineers/CoCoDragonFlexiMIDI-V1R2: CC-FlexiMIDI-V1R0- and CC-FlexiMIDI-V1R1- : Updated to CC-FlexiMIDI-V1R2- on Decem= BACKGROUND: CC-FlexiMIDI-V1R0- A Hardware M.I.D.I.