Difference between revisions of "PDP-8 Front Panel"
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* [[PDP-8 Front Panel Assembly Sheet]] | * [[PDP-8 Front Panel Assembly Sheet]] | ||
| + | * [http://land-boards.com/PDP-8/PDP-8_Rev1_ibom.html PDP-8 Front Panel Rev 1 Interactive BOM] | ||
Latest revision as of 11:30, 24 June 2024
Contents
Features
- 50-pin connector
- 2x25 Pinout matches RETRO-EP4CE15 Card pins (1:1 cable)
- Some unused pins - wired to +3.3V/GND for connecting other cards
- 12 Value LEDs (DB-11) - silkscreen marked in octal format
- DISP pushbutton - Selects what is on the 12 Value LEDs
- I like diffused orange color the best for LEDs - looks retro
- Pushing DISP cycles between LEDs displaying PC, Memory Address, Memory Data, Accumulator
- 12 Load Value Slide Switches (SL0-11) - octal format
- Enter values: Program Counter (PC), Memory Address, Memory Data, Accumulator
- Pushbutton Switches
- STEP pushbutton - Increment PC
- LDPC pushbutton - Store value from Value Slide Switches to Program Counter (PC)
- DEP pushbutton - Store value from Value Slide Switches to memory
- LDA pushbutton - Store value from Value Slide Switches to Accumulator
- RES - Reset pushbutton - Resets CPU
- PB1 - spare pushbutton
- 4 DISP LEDs - Indicates what is being shown on the 12 LEDs
- Cycle between 12 LEDs source with DISP pushbutton
- PC - 12 LEDs display Program Counter value
- MADR - 12 LEDs display Memory Address value
- MD - 12 LEDs display Memory Data value
- AC - 12 LEDs display Accumulator value
- LNK - Link value slide switch
- LINK LED - Displays Link value
- RUN LED - Running program
- RUN/HALT slide switch
- PWR - Power LED
- 95x95mm form factor matches RETRO-EP4CE15
- (4) 6-32 mounting holes
- Boards can be stacked with standoffs
PDP-8 FPGA Designs
- Two working designs
- Tom Almy's PDP-8
- OpenCores PDP-8 FPGA designs
Build of Tom Almy's PDP-8 FPGA (Working 2021-May)
Build is based on Tom Almy's book The PDP-8 Class Project: Resoling An Old Machine.
- Hackaday page with progress logs
- PDP-8 PFGA Design - GitHub repo
- My PDP-8 Software GitHub repository
- PDP-8 with Front Panel and VDU
Hardware used
- RETRO-EP4CE15 - FPGA Hardware used
- QMTECH EP4CE15 FPGA Card
- PDP-8 Front Panel
FPGA Resources
- Front Panel
- Cyclone IV
+----------------------------------------------------------------------------------+ ; Fitter Summary ; +------------------------------------+---------------------------------------------+ ; Fitter Status ; Successful - Sat Apr 30 20:28:20 2022 ; ; Quartus Prime Version ; 21.1.0 Build 842 10/21/2021 SJ Lite Edition ; ; Revision Name ; pdp8 ; ; Top-level Entity Name ; pdp8 ; ; Family ; Cyclone IV E ; ; Device ; EP4CE15F23C8 ; ; Timing Models ; Final ; ; Total logic elements ; 2,390 / 15,408 ( 16 % ) ; ; Total combinational functions ; 2,300 / 15,408 ( 15 % ) ; ; Dedicated logic registers ; 734 / 15,408 ( 5 % ) ; ; Total registers ; 734 ; ; Total pins ; 51 / 344 ( 15 % ) ; ; Total virtual pins ; 0 ; ; Total memory bits ; 98,304 / 516,096 ( 19 % ) ; ; Embedded Multiplier 9-bit elements ; 2 / 112 ( 2 % ) ; ; Total PLLs ; 0 / 4 ( 0 % ) ; +------------------------------------+---------------------------------------------+
OpenCores PDP-8 Build
- Hackaday page with progress logs
- Wider features than Tom Almy's design
- Supports 32 K words of memory
- SD card support
- Boot OS/8
- Land Board OpenCores PDP-8 Builds - GitHub repository
- Two tested/working builds
- Built in ANSI Terminal build
- Serial I/O build
RETRO-EP4CE15_CYCLONE_IV_VDU PDP-8 Build
- RETRO-EP4CE15_CYCLONE_IV_VDU PDP-8 Build
- Built in ANSI Terminal with cpu_001 (IOP16B built-in) - Latest build
- VDU IOP assembly code
- Hackaday project page for ANSI Terminal
RETRO-EP4CE15_CYCLONE_IV PDP-8 Build
- RETRO-EP4CE15_CYCLONE_IV
- Serial only (no VDU)
RETRO-EP4CE15_CYCLONE_V PDP-8 Build
- RETRO-EP4CE15_CYCLONE_V
- WIP - missing pin assignment
Hardware used
- RETRO-EP4CE15 - FPGA Hardware used
- QMTECH EP4CE15 FPGA Card
- PDP-8 Front Panel
FPGA Resources
- ANSI Terminal (IOP-16)
- Cyclone IV
+----------------------------------------------------------------------------------+ ; Fitter Summary ; +------------------------------------+---------------------------------------------+ ; Fitter Status ; Successful - Sat Apr 9 19:53:05 2022 ; ; Quartus Prime Version ; 21.1.0 Build 842 10/21/2021 SJ Lite Edition ; ; Revision Name ; pdp8_top ; ; Top-level Entity Name ; pdp8_top ; ; Family ; Cyclone IV E ; ; Device ; EP4CE15F23C8 ; ; Timing Models ; Final ; ; Total logic elements ; 5,273 / 15,408 ( 34 % ) ; ; Total combinational functions ; 5,023 / 15,408 ( 33 % ) ; ; Dedicated logic registers ; 1,569 / 15,408 ( 10 % ) ; ; Total registers ; 1569 ; ; Total pins ; 128 / 344 ( 37 % ) ; ; Total virtual pins ; 0 ; ; Total memory bits ; 426,112 / 516,096 ( 83 % ) ; ; Embedded Multiplier 9-bit elements ; 2 / 112 ( 2 % ) ; ; Total PLLs ; 0 / 4 ( 0 % ) ; +------------------------------------+---------------------------------------------+
opencores PDP-8 Processor Reference
J1 Connector
- Extra power and ground pins (not on RETRO-EP4CE15 Card)
- Pins 3,4 = GND
- Pins 5-8 = VCC
- Pin 9 = N/C
J1 to RETRO-EP4CE15 Pin Mapping
Real PDP-8/F Front Panel
Pin List for Tom Almy FPGA Build
set_global_assignment -name FAMILY "Cyclone IV E" set_global_assignment -name DEVICE EP4CE15F23C8 set_global_assignment -name TOP_LEVEL_ENTITY pdp8 set_global_assignment -name ORIGINAL_QUARTUS_VERSION 18.1.0 set_global_assignment -name PROJECT_CREATION_TIME_DATE "13:56:19 MARCH 15, 2021" set_global_assignment -name LAST_QUARTUS_VERSION "20.1.0 Lite Edition" set_global_assignment -name PROJECT_OUTPUT_DIRECTORY output_files set_global_assignment -name MIN_CORE_JUNCTION_TEMP 0 set_global_assignment -name MAX_CORE_JUNCTION_TEMP 85 set_global_assignment -name ERROR_CHECK_FREQUENCY_DIVISOR 1 set_global_assignment -name NOMINAL_CORE_SUPPLY_VOLTAGE 1.2V set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top set_global_assignment -name PARTITION_FITTER_PRESERVATION_LEVEL PLACEMENT_AND_ROUTING -section_id Top set_global_assignment -name PARTITION_COLOR 16764057 -section_id Top set_global_assignment -name POWER_PRESET_COOLING_SOLUTION "23 MM HEAT SINK WITH 200 LFPM AIRFLOW" set_global_assignment -name POWER_BOARD_THERMAL_MODEL "NONE (CONSERVATIVE)" set_global_assignment -name TIMING_ANALYZER_MULTICORNER_ANALYSIS ON set_global_assignment -name SMART_RECOMPILE ON set_global_assignment -name PROJECT_IP_REGENERATION_POLICY ALWAYS_REGENERATE_IP set_global_assignment -name STRATIX_DEVICE_IO_STANDARD "3.3-V LVTTL" # Clock, reset button set_location_assignment PIN_T2 -to clk set_location_assignment PIN_K22 -to btnCpuReset set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to btnCpuReset # Run Switch/LED set_location_assignment PIN_H22 -to runSwitch set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to runSwitch set_location_assignment PIN_F21 -to runLED # Serial set_location_assignment PIN_B13 -to RsRx set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to RsRx set_location_assignment PIN_B10 -to RsTx # PS/2 set_location_assignment PIN_R1 -to io_ps2Clk set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to io_ps2Clk set_location_assignment PIN_R2 -to io_ps2Data set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to io_ps2Data # VGA set_location_assignment PIN_A17 -to o_vid_blu[1] set_location_assignment PIN_B17 -to o_vid_blu[0] set_location_assignment PIN_A16 -to o_vid_grn[1] set_location_assignment PIN_B16 -to o_vid_grn[0] set_location_assignment PIN_A15 -to o_vid_red[1] set_location_assignment PIN_B15 -to o_vid_red[0] set_location_assignment PIN_B18 -to o_vid_hSync set_location_assignment PIN_A18 -to o_vid_vSync # 12 Slide switches set_location_assignment PIN_AB14 -to sw[0] set_location_assignment PIN_AB16 -to sw[1] set_location_assignment PIN_AB18 -to sw[2] set_location_assignment PIN_AB19 -to sw[3] set_location_assignment PIN_AA20 -to sw[4] set_location_assignment PIN_W21 -to sw[5] set_location_assignment PIN_V22 -to sw[6] set_location_assignment PIN_U22 -to sw[7] set_location_assignment PIN_R22 -to sw[8] set_location_assignment PIN_N22 -to sw[9] set_location_assignment PIN_M22 -to sw[10] set_location_assignment PIN_L22 -to sw[11] # 12 LEDs set_location_assignment PIN_J21 -to dispLEDs[11] set_location_assignment PIN_L21 -to dispLEDs[10] set_location_assignment PIN_M21 -to dispLEDs[9] set_location_assignment PIN_N21 -to dispLEDs[8] set_location_assignment PIN_P21 -to dispLEDs[7] set_location_assignment PIN_U21 -to dispLEDs[6] set_location_assignment PIN_W22 -to dispLEDs[5] set_location_assignment PIN_Y21 -to dispLEDs[4] set_location_assignment PIN_AA19 -to dispLEDs[3] set_location_assignment PIN_AA18 -to dispLEDs[2] set_location_assignment PIN_AA16 -to dispLEDs[1] set_location_assignment PIN_AA14 -to dispLEDs[0] # Status/Operation LEDs set_location_assignment PIN_K21 -to linkLED set_location_assignment PIN_Y22 -to dispMDLED set_location_assignment PIN_AA17 -to dispMALED set_location_assignment PIN_AA15 -to dispPCLED set_location_assignment PIN_R21 -to dispACLED set_location_assignment PIN_H21 -to lnkSwitch # Pushbuttons set_location_assignment PIN_AB17 -to stepPB set_location_assignment PIN_V21 -to depPB set_location_assignment PIN_AB20 -to ldPCPB set_location_assignment PIN_P22 -to ldACPB set_location_assignment PIN_AB15 -to dispPB
Pin List for OpenCores Build
set_global_assignment -name FAMILY "Cyclone IV E" set_global_assignment -name DEVICE EP4CE15F23C8 set_global_assignment -name TOP_LEVEL_ENTITY pdp8_top set_global_assignment -name ORIGINAL_QUARTUS_VERSION 11.1 set_global_assignment -name PROJECT_CREATION_TIME_DATE "19:28:47 OCTOBER 30, 2013" set_global_assignment -name LAST_QUARTUS_VERSION "20.1.0 Lite Edition" set_global_assignment -name MIN_CORE_JUNCTION_TEMP 0 set_global_assignment -name MAX_CORE_JUNCTION_TEMP 85 set_global_assignment -name ERROR_CHECK_FREQUENCY_DIVISOR 1 set_global_assignment -name POWER_PRESET_COOLING_SOLUTION "23 MM HEAT SINK WITH 200 LFPM AIRFLOW" set_global_assignment -name POWER_BOARD_THERMAL_MODEL "NONE (CONSERVATIVE)" set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top set_global_assignment -name PARTITION_FITTER_PRESERVATION_LEVEL PLACEMENT_AND_ROUTING -section_id Top set_global_assignment -name PARTITION_COLOR 16764057 -section_id Top set_global_assignment -name STRATIX_DEVICE_IO_STANDARD "3.3-V LVTTL" # Clock and reset set_location_assignment PIN_T2 -to CLOCK_50 set_location_assignment PIN_K22 -to reset_n set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to reset_n # PS/2 set_location_assignment PIN_R1 -to io_PS2_CLK set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to io_PS2_CLK set_location_assignment PIN_R2 -to io_PS2_DAT set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to io_PS2_DAT # set_location_assignment PIN_B10 -to TTY1_TXD_Ser set_location_assignment PIN_B13 -to TTY1_RXD_Ser set_location_assignment PIN_A10 -to TTY1_RTS_ser set_location_assignment PIN_A13 -to TTY1_CTS_ser set_location_assignment PIN_B22 -to serSelect set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to serSelect # Video set_location_assignment PIN_B15 -to o_videoR0 set_location_assignment PIN_A15 -to o_videoR1 set_location_assignment PIN_B16 -to o_videoG0 set_location_assignment PIN_A16 -to o_videoG1 set_location_assignment PIN_B17 -to o_videoB0 set_location_assignment PIN_A17 -to o_videoB1 set_location_assignment PIN_B18 -to o_hSync set_location_assignment PIN_A18 -to o_vSync # SD Card set_location_assignment PIN_B19 -to sdCS set_location_assignment PIN_B20 -to sdCLK set_location_assignment PIN_A19 -to sdDI set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to sdDI set_location_assignment PIN_A20 -to sdDO set_location_assignment PIN_B14 -to sdCD set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to sdCD # Front Panel LEDs set_location_assignment PIN_F21 -to RUN_LED set_location_assignment PIN_AA15 -to PC_LED set_location_assignment PIN_R21 -to AC_LED set_location_assignment PIN_AA17 -to MADR_LED set_location_assignment PIN_Y22 -to MD_LED set_location_assignment PIN_K21 -to LINK_LED # Front Panel Pushbuttons and Slide Switches set_location_assignment PIN_P22 -to LDA_PB set_location_assignment PIN_AB20 -to LDPC_PB set_location_assignment PIN_V21 -to DEP_PB set_location_assignment PIN_AB17 -to STEP_PB set_location_assignment PIN_H21 -to LINK_SS set_location_assignment PIN_AB15 -to DISP_PB set_location_assignment PIN_J22 -to EXAM_PB set_location_assignment PIN_H22 -to RUN_SS # 12 LEDs set_location_assignment PIN_AA14 -to OUT12_LEDs[0] set_location_assignment PIN_AA16 -to OUT12_LEDs[1] set_location_assignment PIN_AA18 -to OUT12_LEDs[2] set_location_assignment PIN_AA19 -to OUT12_LEDs[3] set_location_assignment PIN_Y21 -to OUT12_LEDs[4] set_location_assignment PIN_W22 -to OUT12_LEDs[5] set_location_assignment PIN_U21 -to OUT12_LEDs[6] set_location_assignment PIN_P21 -to OUT12_LEDs[7] set_location_assignment PIN_N21 -to OUT12_LEDs[8] set_location_assignment PIN_M21 -to OUT12_LEDs[9] set_location_assignment PIN_L21 -to OUT12_LEDs[10] set_location_assignment PIN_J21 -to OUT12_LEDs[11] # 12 Slide switches set_location_assignment PIN_AB14 -to SW12_SS[0] set_location_assignment PIN_AB16 -to SW12_SS[1] set_location_assignment PIN_AB18 -to SW12_SS[2] set_location_assignment PIN_AB19 -to SW12_SS[3] set_location_assignment PIN_AA20 -to SW12_SS[4] set_location_assignment PIN_W21 -to SW12_SS[5] set_location_assignment PIN_V22 -to SW12_SS[6] set_location_assignment PIN_U22 -to SW12_SS[7] set_location_assignment PIN_R22 -to SW12_SS[8] set_location_assignment PIN_N22 -to SW12_SS[9] set_location_assignment PIN_M22 -to SW12_SS[10] set_location_assignment PIN_L22 -to SW12_SS[11] # SRAM (not used) set_location_assignment PIN_F1 -to n_sRamCS set_location_assignment PIN_J2 -to n_sRamOE set_location_assignment PIN_B4 -to n_sRamWE set_location_assignment PIN_E1 -to sramData[0] set_location_assignment PIN_C1 -to sramData[1] set_location_assignment PIN_B1 -to sramData[2] set_location_assignment PIN_B3 -to sramData[3] set_location_assignment PIN_B2 -to sramData[4] set_location_assignment PIN_C2 -to sramData[5] set_location_assignment PIN_D2 -to sramData[6] set_location_assignment PIN_F2 -to sramData[7] set_location_assignment PIN_H1 -to sramAddress[0] set_location_assignment PIN_J1 -to sramAddress[1] set_location_assignment PIN_M1 -to sramAddress[2] set_location_assignment PIN_N1 -to sramAddress[3] set_location_assignment PIN_P1 -to sramAddress[4] set_location_assignment PIN_P2 -to sramAddress[5] set_location_assignment PIN_N2 -to sramAddress[6] set_location_assignment PIN_M2 -to sramAddress[7] set_location_assignment PIN_H2 -to sramAddress[8] set_location_assignment PIN_A3 -to sramAddress[9] set_location_assignment PIN_A4 -to sramAddress[10] set_location_assignment PIN_C3 -to sramAddress[11] set_location_assignment PIN_A5 -to sramAddress[12] set_location_assignment PIN_A6 -to sramAddress[13] set_location_assignment PIN_A7 -to sramAddress[14] set_location_assignment PIN_A8 -to sramAddress[15] set_location_assignment PIN_B7 -to sramAddress[16] set_location_assignment PIN_B6 -to sramAddress[17] set_location_assignment PIN_B5 -to sramAddress[18] set_location_assignment PIN_C4 -to sramAddress[19] # SDRAM (not used) set_location_assignment PIN_Y6 -to sdRamClk set_location_assignment PIN_W6 -to sdRamClkEn set_location_assignment PIN_AA4 -to n_sdRamCas set_location_assignment PIN_AA3 -to n_sdRamCe set_location_assignment PIN_AB3 -to n_sdRamRas set_location_assignment PIN_AB4 -to n_sdRamWe set_location_assignment PIN_V2 -to sdRamAddr[0] set_location_assignment PIN_V1 -to sdRamAddr[1] set_location_assignment PIN_U2 -to sdRamAddr[2] set_location_assignment PIN_U1 -to sdRamAddr[3] set_location_assignment PIN_V3 -to sdRamAddr[4] set_location_assignment PIN_V4 -to sdRamAddr[5] set_location_assignment PIN_Y2 -to sdRamAddr[6] set_location_assignment PIN_AA1 -to sdRamAddr[7] set_location_assignment PIN_Y3 -to sdRamAddr[8] set_location_assignment PIN_V5 -to sdRamAddr[9] set_location_assignment PIN_W1 -to sdRamAddr[10] set_location_assignment PIN_Y4 -to sdRamAddr[11] set_location_assignment PIN_V6 -to sdRamAddr[12] set_location_assignment PIN_Y1 -to sdRamAddr[13] set_location_assignment PIN_W2 -to sdRamAddr[14] set_location_assignment PIN_AA10 -to sdRamData[0] set_location_assignment PIN_AB9 -to sdRamData[1] set_location_assignment PIN_AA9 -to sdRamData[2] set_location_assignment PIN_AB8 -to sdRamData[3] set_location_assignment PIN_AA8 -to sdRamData[4] set_location_assignment PIN_AB7 -to sdRamData[5] set_location_assignment PIN_AA7 -to sdRamData[6] set_location_assignment PIN_AB5 -to sdRamData[7] set_location_assignment PIN_Y7 -to sdRamData[8] set_location_assignment PIN_W8 -to sdRamData[9] set_location_assignment PIN_Y8 -to sdRamData[10] set_location_assignment PIN_V9 -to sdRamData[11] set_location_assignment PIN_V10 -to sdRamData[12] set_location_assignment PIN_Y10 -to sdRamData[13] set_location_assignment PIN_W10 -to sdRamData[14] set_location_assignment PIN_V11 -to sdRamData[15]
