├── .gitignore ├── COMMON ├── COMMON_INTERNALS.vhdl ├── RA_MUX.vhdl ├── SOFT_SWITCHES_C00X.vhdl └── SOFT_SWITCHES_C05X.vhdl ├── CUSTOM ├── DELAY_OSCILLATOR │ ├── NOP │ │ └── DELAY_OSCILLATOR.vhdl │ ├── VENDOR │ │ └── LATTICE │ │ │ ├── MACHXO2 │ │ │ └── DELAY_OSCILLATOR.vhdl │ │ │ └── MACHXO3D │ │ │ └── DELAY_OSCILLATOR.vhdl │ └── readme.md ├── DRAM_HOLD_TIME │ ├── DELAY_CLK │ │ └── DRAM_HOLD_TIME.vhdl │ ├── NOP │ │ └── DRAM_HOLD_TIME.vhdl │ ├── VENDOR │ │ └── ALTERA │ │ │ └── DRAM_HOLD_TIME.vhdl │ └── readme.md ├── MMU_HOLD_TIME │ ├── DELAY_CLK │ │ └── MMU_HOLD_TIME.vhdl │ ├── NOP │ │ └── MMU_HOLD_TIME.vhdl │ ├── VENDOR │ │ └── ALTERA │ │ │ └── MMU_HOLD_TIME.vhdl │ └── readme.md ├── POWER_ON_DETECTION.vhdl └── readme.md ├── Documentation ├── Understanding_IOU_MMU │ ├── Whats-not-implemented.md │ ├── display-address.md │ ├── iou-address-decoder.md │ ├── iou-soft-switches.md │ ├── iou-timing-signals.md │ ├── iou_keyboard_subsystem.md │ ├── mmu-address-decoder.md │ ├── mmu-misc.md │ ├── mmu-ra-mux.md │ ├── mmu-rom-ram.md │ ├── mmu-soft-switches.md │ ├── readme.md │ ├── reset-and-power-on.md │ ├── spkr-casso-other.md │ ├── ts-notations.md │ └── video-scanner.md ├── building-an-adapter.md ├── readme.md └── using-testbenches.md ├── IOU ├── IOU.vhdl ├── IOU_ADDR_DECODER.vhdl ├── IOU_ADDR_LATCH.vhdl ├── IOU_DEVICES.vhdl ├── IOU_INTERNALS.vhdl ├── IOU_KEYBOARD.vhdl ├── IOU_MD7.vhdl ├── IOU_RESET.vhdl ├── IOU_TIMINGS.vhdl ├── VIDEO_ADDR_MUX.vhdl ├── VIDEO_GENERATOR.vhdl ├── VIDEO_GRAPHICS.vhdl └── VIDEO_SCANNER.vhdl ├── LICENSE ├── MMU ├── DEV_DECODER.vhdl ├── MMU.vhdl ├── MMU_ADDR_DECODER.vhdl ├── MMU_CASEN.vhdl ├── MMU_CXXXOUT.vhdl ├── MMU_EN80.vhdl ├── MMU_INTERNALS.vhdl ├── MMU_KBD.vhdl ├── MMU_MD7.vhdl ├── MMU_MPON.vhdl ├── MMU_RA.vhdl ├── MMU_ROMEN.vhdl ├── MMU_RW245.vhdl ├── MMU_SELMB.vhdl └── MMU_SOFT_SWITCHES_C08X.vhdl ├── Schematics ├── IOU_1.jpg ├── IOU_2.jpg ├── MMU_1.jpg ├── MMU_2..jpg ├── MMU_ASIC.jpg └── readme.md ├── TTL ├── LATCH_9334.vhdl └── LS138.vhdl ├── makefile ├── readme.md ├── resources ├── 555 timer.png ├── AKSTB_Trace.png ├── CASEN_N.png ├── CLRGAT_N.png ├── CLRKEY_N.png ├── CTC14S.png ├── CXXXOUT.png ├── CXXX_PIN.png ├── DRAM_HOLD_TIME.png ├── DRAM_HOLD_TIME.tex ├── EN80_HOLD_TIME.png ├── EN80_HOLD_TIME.tex ├── EN80_N.png ├── HBL_N__VBL_N.png ├── HIRESEN_N.png ├── HPE_N.png ├── HorizontalScannerTrace.png ├── INTIO_KBD.png ├── IOUAddressDecodeTable.png ├── IOUAddressDecoder.png ├── IOUAddressLatch.png ├── IOU_C00X_SoftSwitches.png ├── IOU_C05X_SoftSwitches.png ├── IOU_COLUMN.wavedrom ├── IOU_IDelay.png ├── IOU_MD7_SoftSwitches.png ├── IOU_RA_GEN.png ├── IOU_ROW.png ├── IOU_ROW.wavedrom ├── IOU_column.png ├── KEY.png ├── KEYBOARD_GATE_SCH.png ├── KeyboardStrobe.png ├── LGR_TXT_N.png ├── LGR_TXT_N_SCOPE.png ├── MA12.png ├── MMU_C08X_SoftSwitches.png ├── MMU_DEV.png ├── MMU_INTC8EN_CTC14S.png ├── MMU_RA_GEN.png ├── MMU_ROW.png ├── MMU_column.png ├── MPON_N.png ├── NotImplemented_IOU_1.jpg ├── NotImplemented_IOU_2.jpg ├── NotImplemented_MMU_1.jpg ├── NotImplemented_MMU_2.jpg ├── PAL_Signals.png ├── PCASEN_N__R_W_N_245.png ├── PSYNC_N.png ├── P_PHI_0_1.png ├── P_PHI_0_1_2_Trace.png ├── P_PHI_2.png ├── P_PHI_Signals.png ├── RAS_HoldTime.png ├── RAS_N.png ├── RA_9__RA_10.png ├── RESET_N.png ├── ROMEN_HOLD_TIME.png ├── ROMEN_HOLD_TIME.tex ├── ROMEN_N.png ├── SELMB_N_LOGIC.png ├── SELMB_N_TRANSISTOR.png ├── SPKR_CASSO.png ├── STRBLE_Trace.png ├── SYNC_N_Trace.png ├── ScopeH0.png ├── VTR.png ├── VerticalCounterLoad.png ├── VerticalScannerTrace.png ├── VideoScanner.png ├── VideoScannerBits.png ├── WNDW_N_Timing_Trace.png ├── ZE.png ├── display-address-gen-1.png ├── display-address-gen-2.png ├── mmu-address-decode-2.png ├── mmu-address-decode.png ├── ts-det-a.png ├── ts-det-b.png ├── ts-det-j.png ├── ts-det-l.png ├── ts-det-q.png ├── ts-det-r.png ├── ts-det-s.png ├── ts-det-t.png ├── ts-det-u.png ├── ts-nmos.png ├── ts-superbuffer-handdrawn.png ├── ts-superbuffer.png ├── ts-totem-pole.png ├── videoScannerBits.wavedrom └── vidpg2.png ├── test ├── COMMON │ ├── COMMON_INTERNALS_TB.vhdl │ ├── RA_MUX_TB.vhdl │ ├── SOFT_SWITCHES_C00X_TB.vhdl │ └── SOFT_SWITCHES_C05X_TB.vhdl ├── HAL_TIMING_MOCK.vhdl ├── IOU │ ├── IOU_ADDR_DECODER_TB.vhdl │ ├── IOU_DEVICES_TB.vhdl │ ├── IOU_INTERNALS_TB.vhdl │ ├── IOU_KEYBOARD_TB.vhdl │ ├── IOU_MD7_TB.vhdl │ ├── IOU_RESET_TB.vhdl │ ├── IOU_TESTBENCH_PACKAGE.vhdl │ ├── IOU_TIMINGS_TB.vhdl │ ├── POWER_ON_DETECTION_TB.vhdl │ ├── VIDEO_ADDR_LATCH_TB.vhdl │ ├── VIDEO_ADDR_MUX_TB.vhdl │ ├── VIDEO_GENERATOR_TB.vhdl │ ├── VIDEO_GRAPHICS_TB.vhdl │ ├── VIDEO_SCANNER_TB.vhdl │ └── test_cases │ │ ├── IOU_TB_ADDRESSING.vhdl │ │ ├── IOU_TB_KEYS.vhdl │ │ ├── IOU_TB_RESET_N_POWER_ON.vhdl │ │ ├── IOU_TB_SCANNER_HORIZONTAL.vhdl │ │ ├── IOU_TB_SCANNER_MUX_HIRES.vhdl │ │ ├── IOU_TB_SCANNER_MUX_TEXT.vhdl │ │ ├── IOU_TB_SCANNER_VERTICAL_EUROPEAN.vhdl │ │ ├── IOU_TB_SCANNER_VERTICAL_NTSC.vhdl │ │ ├── IOU_TB_SOFT_SWITCHES.vhdl │ │ ├── IOU_TB_TIMINGS.vhdl │ │ └── mocks │ │ ├── CPU_MMU_MOCK.vhdl │ │ ├── IOU_ADDR_DECODER_SPY.vhdl │ │ ├── IOU_ADDR_LATCH_SPY.vhdl │ │ ├── IOU_INTERNALS_SPY.vhdl │ │ ├── IOU_KEYBOARD_SPY.vhdl │ │ ├── IOU_RESET_MOCK.vhdl │ │ ├── IOU_RESET_SPY.vhdl │ │ ├── POWER_ON_DETECTION_MOCK.vhdl │ │ ├── VIDEO_ADDR_MUX_SPY.vhdl │ │ └── VIDEO_SCANNER_SPY.vhdl ├── IOU_MMU_CONTENTION_TB.vhdl ├── MMU │ ├── DEV_DECODER_TB.vhdl │ ├── MMU_ADDR_DECODER_TB.vhdl │ ├── MMU_CASEN_TB.vhdl │ ├── MMU_CXXXOUT_TB.vhdl │ ├── MMU_EN80_TB.vhdl │ ├── MMU_INTERNALS_TB.vhdl │ ├── MMU_KBD_TB.vhdl │ ├── MMU_MD7_TB.vhdl │ ├── MMU_MPON_TB.vhdl │ ├── MMU_RA_TB.vhdl │ ├── MMU_ROMEN_TB.vhdl │ ├── MMU_RW245_TB.vhdl │ ├── MMU_SELMB_TB.vhdl │ ├── MMU_SOFT_SWITCHES_C08X_TB.vhdl │ └── test_cases │ │ ├── MMU_TB_GATINGS.vhdl │ │ ├── MMU_TB_KBD.vhdl │ │ ├── MMU_TB_MD7.vhdl │ │ ├── MMU_TB_MPON.vhdl │ │ ├── MMU_TB_RA_ADDR.vhdl │ │ ├── MMU_TB_RA_STATE.vhdl │ │ ├── MMU_TB_ROMEN1.vhdl │ │ ├── MMU_TB_ROMEN2.vhdl │ │ └── MMU_TB_RW245.vhdl ├── TEST_UTILS.vhdl └── TTL │ ├── 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