plasmo Messages: 916 Registered: March 2017 Location: New Mexico, USA
Senior Member
The protoboard has CPLD to interface to RC2014 bus where I/O address $ee selects allophone value and $ef monitor SP0256 status. The SP0256 is currently wired up to use internal ROM, but there is room to handle external ROM. I'll keep the internal ROM configuration for a few days since I have 3 SP0256 coming from China which are most likely fake. After that I'll wire it for external ROM configuration.
The SP0256 datasheet published by Archer has a section on Allophones and provided examples for 250 or so words, so the Z80 program just copies the allophone examples of days of the week.
Bill
RetroBrew Computers Forum
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