; JED2EQN -- JEDEC file to Boolean Equations disassembler (Version V063) ; Copyright (c) National Semiconductor Corporation 1990-1993 ; Disassembled from J191-V1-I3-U24-Cypress-PALC22V10D-15PC-CSA6F3.JED. Date: 2022-03-12 ; ; Board: J191 version 1 issue 3 ; ; Location: U7 ; ; Function: partially analysed. ; ; Status: disassembled from JEDEC data from PAL, but not tested yet. ; ; ; chip J191-U24 PAL22V10 CLK = 1 ; from CPU A23 = 2 ; from CPU A22 = 3 ; from CPU A21 = 4 ; from CPU A20 = 5 ; from CPU /FC210_INTACK = 6 ; RnW = 7 ; from CPU /UDS = 8 ; from CPU /LDS = 9 ; from CPU /RESET = 10 ; from CPU cold_reset = 11 ; from reset chip GND = 12 ; /AS = 13 ; Address Strobe from CPU reset_active_high = 14 ; f15 = 15 ; f16 = 16 ; cold_booted = 17 ; /RAM_CS_to_U14_pin_14 = 18 ; /lower_data_write = 19 ; /RAM_upper_data_write = 20 ; /lower_data_read = 21 ; /RAM_upper_data_read = 22 ; /UDS_or_LDS = 23 ; VCC = 24 ; equations ; intermediate equations: read = RnW write = /RnW ROM_space = A23 * A22 * A21 * A20 ; lowest megabyte RAM_space = /A23 * /A22 * /A21 * /A20 ; last megabyte ; pins: global.re = cold_reset UDS_or_LDS = UDS + LDS RAM_upper_data_read = UDS * RAM_CS_to_U14_pin_14 * read + UDS * RAM_upper_data_read RAM_upper_data_write = UDS * RAM_CS_to_U14_pin_14 * write + UDS * RAM_upper_data_write lower_data_read = LDS * RAM_CS_to_U14_pin_14 * read + LDS * ROM_space * /FC210_INTACK * AS * read + LDS * lower_data_read lower_data_write = LDS * RAM_CS_to_U14_pin_14 * write + LDS * ROM_space * /FC210_INTACK * AS * write + LDS * lower_data_write RAM_CS_to_U14_pin_14 = RAM_space * /FC210_INTACK * AS * cold_booted cold_booted := /cold_booted * f16 * f15 + cold_booted ; latched while power on f16 := /f16 * f15 + f16 * /f15 f15 := /f15 * /cold_booted * /f16 + /f15 * f16 + /f15 * cold_booted reset_active_high = RESET cold_booted.oe = vcc /UDS_or_LDS.oe = vcc /RAM_upper_data_read.oe = vcc /lower_data_read.oe = vcc /RAM_upper_data_write.oe = vcc /lower_data_write.oe = vcc /RAM_CS_to_U14_pin_14.oe = vcc f16.oe = vcc f15.oe = vcc reset_active_high.oe = vcc