Quazar OLED interface

  
 Official site: https://2014.samcoupe.com/#graphicoled 
 Based on SSD1305 OLED display (128x32 version?): SSD1305.pdf 
 Uses  0x50 I/O port by default (fully configurable). I/O decoder uses 74HCT02 NOR gates and  74GCT688 8-bit comparator. 
 The SSD1305 chip is placed behind two 74HCT573 8-bit latches so it can be timed slower than Z80 bus: 
 
 One latch takes 8 bit data bus and forwards to the OLED chip. 
 The other latch takes 3 control bits from higher address buss byte as output from B register. 
 Latches take input on I/O bus write when base address matches.
 
 Compactor is enabled when RW and IORQ are active (low). 
 If address matches the I/O address select the latches will copy and store data from data bus and first 3-bits from high address byte. 
 The latched data is presented to OLED until the next I/O write to the card occurs. 
 
 
 
 Software 
 I have implemented a program to display images using instructions form provided manual: 
 
   rc2014-oled - oled program for CP/M and PNG image converter.