+acadiel Posted October 25, 2020 Share Posted October 25, 2020 I’ve always wanted to show this comparison. The form factors are almost virtually identical, and yes, they fit right into the /4A. Logic and layout inside is completely different, though. I will compare the pinout between the two as soon as I get a chance. 1 Quote Link to comment Share on other sites More sharing options...
+acadiel Posted October 25, 2020 Author Share Posted October 25, 2020 The cartridge pinout is close: Pin TI-99/4A Tutor 1 RESET GND 2 GND GND 3 D7 D7 4 CRUCLK* N/C 5 D6 D6 6 CRUIN N/C 7 D5 D5 8 A15/OUT A15/CRUOUT 9 D4 D4 10 A13 A13 11 D3 D3 12 A12 A12 13 D2 D2 14 A11 A11 15 D1 D1 16 A10 A10 17 D0 D0 18 A9 A9 19 VCC/+5V VCC 20 A8 A8 21 GS* /CS CROM1 22 A7 A7 23 A14 A14 24 A3 A3 25 DBIN A2 26 A6 A6 27 GROMCLK GROMCLK 28 A5 A5 29 VDD/-5V /DBIN 30 A4 A4 31 GROM RDY /WE /CPUCLK 32 WE* N/C 33 Vss (GND) N/C 34 ROMG* N/C 35 GND /CS CROM0 36 Vss (GND) N/C 3 Quote Link to comment Share on other sites More sharing options...
+acadiel Posted February 7, 2022 Author Share Posted February 7, 2022 Here's a 27512 to Pyuuta pinout thanks to @tanam1972 27C512 PYUTA PIN 1 A15 A0 PIN 2 A12 A3 PIN 3 A7 A8 PIN 4 A6 A9 PIN 5 A5 A10 PIN 6 A4 A11 PIN 7 A3 A12 PIN 8 A2 A13 PIN 9 A1 A14 PIN10 A0 A15 PIN11 D0 D7 PIN12 D1 D6 PIN13 D2 D5 PIN14 GND GND PIN15 D3 D4 PIN16 D4 D3 PIN17 D5 D2 PIN18 D6 D1 PIN19 D7 D0 PIN20 /CE NC PIN21 A10 A5 PIN22 /OE /DBIN PIN23 A11 A4 PIN24 A9 A6 PIN25 A8 A7 PIN26 A13 A2 PIN27 A14 A1 PIN28 VCC VCC Cartridge address space: 32KB (4000-BFFF) 16KB (8000-BFFF) 8KB (8000-9FFF) 1 Quote Link to comment Share on other sites More sharing options...
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