Difference between revisions of "PDP-8 Front Panel"
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* 50 pin connector | * 50 pin connector | ||
** Pinout matches [[RETRO-EP4CE15]] Card pins | ** Pinout matches [[RETRO-EP4CE15]] Card pins | ||
− | * 12 Value LEDs - octal format | + | * 12 Value LEDs (DB0-11) - octal format |
** Display options: Program Counter (PC), Memory Address, Memory Data, Accumulator | ** Display options: Program Counter (PC), Memory Address, Memory Data, Accumulator | ||
− | * 12 Load Value Slide Switches - octal format | + | * 12 Load Value Slide Switches (SL0-11) - octal format |
** Enter values: PC, Memory Address, Memory Data, Accumulator | ** Enter values: PC, Memory Address, Memory Data, Accumulator | ||
+ | * LNK - Link value slide switch | ||
* DISP - Display 12 Value LEDs select pushbutton | * DISP - Display 12 Value LEDs select pushbutton | ||
** Cycles between LEDs displaying PC, Memory Address, Memory Data, Accumulator | ** Cycles between LEDs displaying PC, Memory Address, Memory Data, Accumulator | ||
Line 18: | Line 19: | ||
** RES - Reset pushbutton - Resets CPU | ** RES - Reset pushbutton - Resets CPU | ||
** PB1 - spare pushbutton | ** PB1 - spare pushbutton | ||
− | |||
* 4 DISP LEDs - Cycle between 12 LEDs source with DISP pushbutton | * 4 DISP LEDs - Cycle between 12 LEDs source with DISP pushbutton | ||
** PC - 12 LEDs display Program Counter value | ** 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 | * LINK LED - Displays Link value | ||
* RUN LED - Running program | * RUN LED - Running program |
Revision as of 17:20, 18 April 2021
Contents
Features
- 50 pin connector
- 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