Difference between revisions of "PDP-8 Front Panel"
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set_location_assignment PIN_B18 -to o_vid_hSync | set_location_assignment PIN_B18 -to o_vid_hSync | ||
set_location_assignment PIN_A18 -to o_vid_vSync | set_location_assignment PIN_A18 -to o_vid_vSync | ||
− | # | + | # Front Panel |
set_location_assignment PIN_AB15 -to btnc | set_location_assignment PIN_AB15 -to btnc | ||
set_location_assignment PIN_V21 -to btnd | set_location_assignment PIN_V21 -to btnd |
Revision as of 00:11, 21 May 2021
Contents
Features
- 50 pin connector
- 2x25 Pinout matches RETRO-EP4CE15 Card pins
- 12 Value LEDs (DB0-11) - octal format
- Display options: Program Counter (PC), Memory Address, Memory Data, Accumulator
- 12 Load Value Slide Switches (SL0-11) - octal format
- Enter values: PC, Memory Address, Memory Data, Accumulator
- LNK - Link value slide switch
- DISP - Display 12 Value LEDs select pushbutton
- Cycles between LEDs displaying PC, Memory Address, Memory Data, Accumulator
- Pushbutton Switches
- STEP pushbutton - Increment PC
- LDPC pushbutton - Load PC from Value Slide Switches
- 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 - 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
- LINK LED - Displays Link value
- RUN LED - Running program
- RUN/HALT slide switch
- PWR - Power LED
- 95x95mm form factor
- (4) 6-32 mounting holes
PDP-8 FPGA Design
- The PDP-8 Class Project -or- Resoling an Old Machine by Tom Almy - Amazon link (Kindle e-boot or paper)
- PDP-8 PFGA Design - GitHub repo
J1 Connector
- Extra power and ground pins (not on RETRO-EP4CE15 Card)
- Pins 3,4 = GND
- Pins 5-8 = VCC
- Pin 9 = N/C
Real PDP-8/F Front Panel
Pin List
# 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_AA14 -to runSwitch set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to runSwitch set_location_assignment PIN_E4 -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 # Front Panel set_location_assignment PIN_AB15 -to btnc set_location_assignment PIN_V21 -to btnd set_location_assignment PIN_AB20 -to btnl set_location_assignment PIN_P22 -to btnr set_location_assignment PIN_AB17 -to btnu set_location_assignment PIN_AA15 -to selLEDs[3] set_location_assignment PIN_AA17 -to selLEDs[2] set_location_assignment PIN_Y22 -to selLEDs[1] set_location_assignment PIN_R21 -to selLEDs[0] set_location_assignment PIN_AB14 -to sw[11] set_location_assignment PIN_AB16 -to sw[10] set_location_assignment PIN_AB18 -to sw[9] set_location_assignment PIN_AB19 -to sw[8] set_location_assignment PIN_AA20 -to sw[7] set_location_assignment PIN_W21 -to sw[6] set_location_assignment PIN_V22 -to sw[5] set_location_assignment PIN_U22 -to sw[4] set_location_assignment PIN_R22 -to sw[3] set_location_assignment PIN_N22 -to sw[2] set_location_assignment PIN_M22 -to sw[1] set_location_assignment PIN_L22 -to sw[0] set_location_assignment PIN_H21 -to sw[12]