RETRO-65C816

RETRO-65C816 Rev 1

Features

• Design based on RETRO-EP4CE15 card
  • Adds 65C816 CPU
  • 5V level translator for keyboard
  • 5V header moved to board edge
• 65C816 CPU
  • 3.3V
  • 8 MHz
  • All pins are brought to FPGA
  • Address A0-A15 and Data lines also go directly to the SRAM
  • FPGA can have the ROM internally or download it to the SRAM
• 1MB SRAM
  • 45nS access time
• USB B
  • FTDI USB to TTL
  • Tx/Rx LEDs
• VGA
  • 3:3:2 R:G:B
• PS/2 keyboard
  • 5V KEYBOARD
  • Level translator to 3.3V for FPGA
• SD card socket
  • Full-sized SD
• QMTECH FPGA card mounts on top
  • QMTECH EP4CE15 FPGA Card
  • QMTECH EP4CE55 FPGA Card
  • QMTECH 5CEFA2F23 FPGA Card
  • QMTECH Cyclone 10CL006 FPGA Card
• 95x95mm card
  • ODAS form factor
• (4) 6-32 Mounting holes

65C816 CPU

65C816 Datasheet

Block Diagram

Timing

Connectors

H1 - 5V

• Install jumper to power card from USB

H2 - VREG I/O Conn

• Power to J1

J1 - I/O Connector

• 50-pin I/O Connector

J2 - Keyboard

• 1x4 header

J3 - 6 FPGA pins

J4 - USB B Serial/Power

• Serial to/from FTDI
• Can power the card

J5 - 5V/GND

• 5V/ground for external 5V logic

J7 Pin Mapping Card to FPGA pins - Right connector

U7 PIN	EP4CE15	EP4CE55	5CEFA2	CYC 10	FUNCTION		U7 PIN	EP4CE15	EP4CE55	5CEFA2	CYC 10	FUNCTION
1	GND	GND	GND	GND	GND		2	GND	GND	GND	GND	GND
3	3.3V	3.3V	3.3V	3.3V	3.3V		4	3.3V	3.3V	3.3V	3.3V	3.3V
5	GND	GND	GND	GND	GND		6	GND	GND	GND	GND	GND
7	PIN_R1	PIN_R1	PIN_AA2	PIN_G1	PS2CLK		8	PIN_R2	PIN_R2	PIN_AA1	PIN_G2	PS2DAT
9	PIN_P1	PIN_P1	PIN_Y3	PIN_D1	SRAMA4		10	PIN_P2	PIN_P2	PIN_W2	PIN_C2	SRAMA5
11	PIN_N1	PIN_N1	PIN_U1	PIN_B1	SRAMA3		12	PIN_N2	PIN_N2	PIN_U2	PIN_F5	SRAMA6
13	PIN_M1	PIN_M1	PIN_N1	PIN_D3	SRAMA2		14	PIN_M2	PIN_M2	PIN_N2	PIN_C3	SRAMA7
15	PIN_J1	PIN_J1	PIN_L1	PIN_B3	SRAMA1		16	PIN_J2	PIN_J2	PIN_L2	PIN_A3	SRAM0E_N
17	PIN_H1	PIN_H1	PIN_G1	PIN_B4	SRAMA0		18	PIN_H2	PIN_H2	PIN_G2	PIN_A4	SRAMA8
19	PIN_F1	PIN_F1	PIN_E2	PIN_E5	SRAMCS_N		20	PIN_F2	PIN_F2	PIN_D3	PIN_A2	SRAMD7
21	PIN_E1	PIN_E1	PIN_C1	PIN_D4	SRAMD0		22	PIN_D2	PIN_D2	PIN_C2	PIN_E6	SRAMD6
23	PIN_C1	PIN_C1	PIN_G6	PIN_C6	SRAMD1		24	PIN_C2	PIN_C2	PIN_H6	PIN_D6	SRAMD5
25	PIN_B1	PIN_B1	PIN_G8	PIN_B5	SRAMD2		26	PIN_B2	PIN_B2	PIN_H8	PIN_A5	SRAMD4
27	PIN_B3	PIN_B3	PIN_F7	PIN_B6	SRAMD3		28	PIN_A3	PIN_A3	PIN_E7	PIN_A6	SRAMA9
29	PIN_B4	PIN_B4	PIN_D6	PIN_B7	SRAMWE_N		30	PIN_A4	PIN_A4	PIN_C6	PIN_A7	SRAMA10
31	PIN_C4	PIN_C4	PIN_E9	PIN_D8	SRAMA19		32	PIN_C3	PIN_C3	PIN_D9	PIN_C8	SRAMA11
33	PIN_B5	PIN_B5	PIN_B5	PIN_D9	SRAMA18		34	PIN_A5	PIN_A5	PIN_A5	PIN_C9	SRAMA12
35	PIN_B6	PIN_B6	PIN_B6	PIN_B8	SRAMA17		36	PIN_A6	PIN_A6	PIN_B7	PIN_A8	SRAMA13
37	PIN_B7	PIN_B7	PIN_A7	PIN_B9	SRAMA16		38	PIN_A7	PIN_A7	PIN_A8	PIN_A9	SRAMA14
39	PIN_B8	PIN_B8	PIN_A9	PIN_E9	N/C		40	PIN_A8	PIN_A8	PIN_A10	PIN_E8	SRAMA15
41	PIN_B9	PIN_B9	PIN_B10	PIN_E11	CARDDET		42	PIN_A9	PIN_A9	PIN_C9	PIN_E10	N/C
43	PIN_B10	PIN_B10	PIN_G10	PIN_A10	USBRX/o_FPGATX		44	PIN_A10	PIN_A10	PIN_F10	PIN_B10	USBCTS/o_FPGARTS
45	PIN_B13	PIN_B13	PIN_C11	PIN_D12	USBTX/i_FPGARX		46	PIN_A13	PIN_A13	PIN_B11	PIN_D11	UBSRTS/i_FPGACTS
47	PIN_B14	PIN_B14	PIN_B12	PIN_B11	REDHI		48	PIN_A14	PIN_A14	PIN_A12	PIN_A11	REDMID
49	PIN_B15	PIN_B15	PIN_E12	PIN_B12	REDLO		50	PIN_A15	PIN_A15	PIN_D12	PIN_A12	GRNHI
51	PIN_B16	PIN_B16	PIN_D13	PIN_B13	GRNMID		52	PIN_A16	PIN_A16	PIN_C13	PIN_A13	GRNLO
53	PIN_B17	PIN_B17	PIN_B13	PIN_B14	BLUHI		54	PIN_A17	PIN_A17	PIN_A13	PIN_A14	BLULO
55	PIN_B18	PIN_B18	PIN_A15	PIN_D14	HSYNC		56	PIN_A18	PIN_A18	PIN_A14	PIN_C14	VSYNC
57	PIN_B19	PIN_B19	PIN_B15	PIN_B16	SDCS_N		58	PIN_A19	PIN_A19	PIN_C15	PIN_A15	SD_MOSI
59	PIN_B20	PIN_B20	PIN_C16	PIN_C16	SD_SCK		60	PIN_A20	PIN_A20	PIN_B16	PIN_C15	SD_MISO
61	GND	GND	GND	GND	GND		62	GND	GND	GND	GND	GND
63	VIN	VIN	VIN	VIN	VIN		64	VIN	VIN	VIN	VIN	VIN

J8 Pin Mapping Card to FPGA pins - Left connector

• Cyclone 10 notes
  • Cannot place output or bidirectional pin J8IO[35] in input pin location M16
  • Cannot place output or bidirectional pin J8IO[36] in input pin location M15
  • Cannot place output or bidirectional pin J8IO[57] in input pin location E16
  • Cannot place output or bidirectional pin J8IO[58] in input pin location E15

U8 PIN	EP4CE15	EP4CE55	5CEFA2	10C1006	J1	Function		U8 PIN	EP4CE15	EP4CE55	5CEFA2	10C1006	J1	Function
1	GND	GND	GND	GND	N/C			2	GND	GND	GND	GND	N/C
3	3.3V	3.3V	3.3V	3.3V	J1-1			4	3.3V	3.3V	3.3V	3.3V	J1-2
5	GND	GND	GND	GND	N/C			6	GND	GND	GND	GND	N/C
7	PIN_AA13	PIN_AA13	PIN_AA14	PIN_R9	N/C	CPUE		8	PIN_AB13	PIN_AB13	PIN_AA13	PIN_T9	N/C	CPURES*
9	PIN_AA14	PIN_AA14	PIN_AA15	PIN_R10	J1-4	CPUMX		10	PIN_AB14	PIN_AB14	PIN_AB15	PIN_T10	J1-3	CPUCLK
11	PIN_AA15	PIN_AA15	PIN_Y15	PIN_R11	J1-6	CPUBE		12	PIN_AB15	PIN_AB15	PIN_Y13	PIN_T11	J1-5	CPUNMIB
13	PIN_AA16	PIN_AA16	PIN_AB18	PIN_R12	J1-8	CPURWB		14	PIN_AB16	PIN_AB16	PIN_AB17	PIN_T12	J1-7	CPUIRQB
15	PIN_AA17	PIN_AA17	PIN_Y7	PIN_N9	J1-10	CPUVDA		16	PIN_AB17	PIN_AB17	PIN_Y16	PIN_M9	J1-9	CPUABORTB
17	PIN_AA18	PIN_AA18	PIN_AA18	PIN_M10	J1-12	CPUVPA		18	PIN_AB18	PIN_AB18	PIN_AA17	PIN_P9	J1-11	CPURDY
19	PIN_AA19	PIN_AA19	PIN_AA20	PIN_P11	J1-14	CPUVPB		20	PIN_AB19	PIN_AB19	PIN_AA19	PIN_N11	J1-13	CPUMLB
21	PIN_AA20	PIN_AA20	PIN_Y20	PIN_R13	I1-16			22	PIN_AB20	PIN_AB20	PIN_Y19	PIN_T13	J1-15
23	PIN_Y22	PIN_Y22	PIN_AB21	PIN_T15	J1-18			24	PIN_Y21	PIN_Y21	PIN_AB20	PIN_T14	J1-17
25	PIN_W22	PIN_W22	PIN_AA22	PIN_N12	J1-20			26	PIN_W21	PIN_W21	PIN_AB22	PIN_M11	J1-19
27	PIN_V22	PIN_V22	PIN_W22	PIN_R14	J1-22			28	PIN_V21	PIN_V21	PIN_Y22	PIN_N13	J1-21
29	PIN_U22	PIN_U22	PIN_Y21	PIN_N14	J1-24			30	PIN_U21	PIN_U21	PIN_W21	PIN_P14	J1-23
31	PIN_R22	PIN_R22	PIN_U22	PIN_P16	J1-26			32	PIN_R21	PIN_R21	PIN_V21	PIN_R16	J1-25
33	PIN_P22	PIN_P22	PIN_V20	PIN_N16	J1-28			34	PIN_P21	PIN_P21	PIN_W19	PIN_N15	J1-27
35	PIN_N22	PIN_N22	PIN_U21	PIN_M16 (Note)	J3-3			36	PIN_N21	PIN_N21	PIN_U20	PIN_M15 (Note)	J3-1
37	PIN_M22	PIN_M22	PIN_R22	PIN_L16	J1-30			38	PIN_M21	PIN_M21	PIN_T22	PIN_L15	J1-29
39	PIN_L22	PIN_L22	PIN_P22	PIN_P15	J1-32			40	PIN_L21	PIN_L21	PIN_R21	PIN_M12	J1-31
41	PIN_K22	PIN_K22	PIN_T20	PIN_L14	J1-34			42	PIN_K21	PIN_K21	PIN_T19	PIN_L13	J1-33
43	PIN_J22	PIN_J22	PIN_P16	PIN_K16	J1-36			44	PIN_J21	PIN_J21	PIN_P17	PIN_K15	J1-35
45	PIN_H22	PIN_H22	PIN_N20	PIN_K12	J1-38			46	PIN_H21	PIN_H21	PIN_N21	PIN_J12	J1-37
47	PIN_F22	PIN_F22	PIN_M21	PIN_J14	J1-40			48	PIN_F21	PIN_F21	PIN_M20	PIN_J13	J1-39
49	PIN_E22	PIN_E22	PIN_M18	PIN_K11	J1-42			50	PIN_E21	PIN_E21	PIN_N19	PIN_J11	J1-41
51	PIN_D22	PIN_D22	PIN_L18	PIN_G11	J1-44			52	PIN_D21	PIN_D21	PIN_L19	PIN_F11	J1-43
53	PIN_C22	PIN_C22	PIN_M22	PIN_F13	J1-46			54	PIN_C21	PIN_C21	PIN_L22	PIN_F14	J1-45
55	PIN_B22	PIN_B22	PIN_L17	PIN_F10	J1-48			56	PIN_B21	PIN_B21	PIN_K17	PIN_F9	J1-47
57	PIN_N20	PIN_N20	PIN_K22	PIN_E16 (Note)	J3-5			58	PIN_N19	PIN_N19	PIN_K21	PIN_E15 (Note)	J3-7
59	PIN_M20	PIN_M20	PIN_M16	PIN_D16	J3-9			60	PIN_M19	PIN_M19	PIN_N16	PIN_D15	J3-11
61	GND	GND	GND	GND	J1-50			62	GND	GND	GND	GND	J1-49
63	+5V	+5V	+5V	+5V	J1-50			64	+5V	+5V	+5V	+5V	J1-50

P1 - VGA

• DB-15HD connector
• 3:3:2 R:G:B

P2 - PS/2 Keyboard

• Purple DIN-6 for PS/2 keyboard

P4 - SD Card

Mechanicals

MultiComp On RETRO-65C816 VHDL Code

• MultiComp On RETRO-65C816 GitHub page

References/Notes

• On the usefulness of 65816 as a 65C02 alternative
  • Helpful timing information

...potential for data bus contention during Ø2 low. My solution was two-fold: use VDA and VPA to qualify chip selects, and qualify read-accesses with Ø2. The former assures that an addressed device will not respond to selection until the address bus is truly valid—invalid bus states may occur during the execution of some instructions. The latter assures that a selected device will not drive the data bus when the '816 is presenting A16-A23 on it. This solution doesn't totally eliminate the risk of contention but greatly narrows the window of opportunity for it. The need for more stringent qualifying of D0-D7 would depend on the peripheral silicon on the bus. In the case of POC and the Ø2 rate I'm using (12.5 MHz maximum), everything gets off the data bus before the '816 starts to drive it with the bank address. That would not be the case if I were to increase Ø2 to 20 MHz, however.

Floating the buses with BE creates the odd situation where no valid address exists on A0-A15, which I daresay could cause a device to be selected solely because of a residual charge in bus capacitance. Also, BE floats the RWB signal*, which may trip up other logic that is dependent on RWB always being driven to one state or the other. The most fool-proof solution is the use of a data bus transceiver as you suggested, which is a straightforward method (74AC245 or 74AHC245 recommended if Ø2 will exceed 8 MHz).

Pin List (10CL006YU256C8G)

set_global_assignment -name FAMILY "Cyclone 10 LP"
set_global_assignment -name DEVICE 10CL006YU256C8G
set_global_assignment -name TOP_LEVEL_ENTITY M6502_VGA
set_global_assignment -name ORIGINAL_QUARTUS_VERSION "13.0 SP1"
set_global_assignment -name PROJECT_CREATION_TIME_DATE "18:01:55  MARCH 31, 2019"
set_global_assignment -name LAST_QUARTUS_VERSION "21.1.0 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 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 STRATIX_DEVICE_IO_STANDARD "3.3-V LVTTL"
set_global_assignment -name USE_CONFIGURATION_DEVICE OFF
set_global_assignment -name CRC_ERROR_OPEN_DRAIN OFF
set_global_assignment -name OUTPUT_IO_TIMING_NEAR_END_VMEAS "HALF VCCIO" -rise
set_global_assignment -name OUTPUT_IO_TIMING_NEAR_END_VMEAS "HALF VCCIO" -fall
set_global_assignment -name OUTPUT_IO_TIMING_FAR_END_VMEAS "HALF SIGNAL SWING" -rise
set_global_assignment -name OUTPUT_IO_TIMING_FAR_END_VMEAS "HALF SIGNAL SWING" -fall
set_global_assignment -name CYCLONEII_RESERVE_NCEO_AFTER_CONFIGURATION "USE AS REGULAR IO"
# Clock, reset switch
set_location_assignment PIN_E1 -to i_clk_50
set_location_assignment PIN_J6 -to i_n_reset
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to i_n_reset
# PS/2 keyboard
set_location_assignment PIN_G1 -to io_ps2Clk
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to io_ps2Clk
set_location_assignment PIN_G2 -to io_ps2Data
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to io_ps2Data
# Serial port with RTS/CTS
set_location_assignment PIN_D11 -to i_n_cts
set_location_assignment PIN_D12 -to i_rxd
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to i_rxd
set_location_assignment PIN_B10 -to o_n_rts
set_location_assignment PIN_A10 -to o_txd
# Video
set_location_assignment PIN_B12 -to o_vid_red[0]
set_location_assignment PIN_A11 -to o_vid_red[1]
set_location_assignment PIN_B11 -to o_vid_red[2]
set_location_assignment PIN_A13 -to o_vid_grn[0]
set_location_assignment PIN_B13 -to o_vid_grn[1]
set_location_assignment PIN_A12 -to o_vid_grn[2]
set_location_assignment PIN_A14 -to o_vid_blu[0]
set_location_assignment PIN_B14 -to o_vid_blu[1]
set_location_assignment PIN_D14 -to o_vid_hSync
set_location_assignment PIN_C14 -to o_vid_vSync
# SRAM
set_location_assignment PIN_E5 -to o_n_sRamCS
set_location_assignment PIN_A3 -to o_n_sRamOE
set_location_assignment PIN_B7 -to o_n_sRamWE
set_location_assignment PIN_D4 -to io_sramData[0]
set_location_assignment PIN_C6 -to io_sramData[1]
set_location_assignment PIN_B5 -to io_sramData[2]
set_location_assignment PIN_B6 -to io_sramData[3]
set_location_assignment PIN_A5 -to io_sramData[4]
set_location_assignment PIN_D6 -to io_sramData[5]
set_location_assignment PIN_E6 -to io_sramData[6]
set_location_assignment PIN_A2 -to io_sramData[7]
set_location_assignment PIN_B4 -to o_sramAddress[0]
set_location_assignment PIN_B3 -to o_sramAddress[1]
set_location_assignment PIN_D3 -to o_sramAddress[2]
set_location_assignment PIN_B1 -to o_sramAddress[3]
set_location_assignment PIN_D1 -to o_sramAddress[4]
set_location_assignment PIN_C2 -to o_sramAddress[5]
set_location_assignment PIN_F5 -to o_sramAddress[6]
set_location_assignment PIN_C3 -to o_sramAddress[7]
set_location_assignment PIN_A4 -to o_sramAddress[8]
set_location_assignment PIN_A6 -to o_sramAddress[9]
set_location_assignment PIN_A7 -to o_sramAddress[10]
set_location_assignment PIN_C8 -to o_sramAddress[11]
set_location_assignment PIN_C9 -to o_sramAddress[12]
set_location_assignment PIN_A8 -to o_sramAddress[13]
set_location_assignment PIN_A9 -to o_sramAddress[14]
set_location_assignment PIN_E8 -to o_sramAddress[15]
set_location_assignment PIN_B9 -to o_sramAddress[16]
set_location_assignment PIN_B8 -to o_sramAddress[17]
set_location_assignment PIN_D9 -to o_sramAddress[18]
set_location_assignment PIN_D8 -to o_sramAddress[19]
# SD Card
set_location_assignment PIN_B16 -to sdCS
set_location_assignment PIN_C15 -to sdMISO
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to sdMISO
set_location_assignment PIN_A15 -to sdMOSI
set_location_assignment PIN_C16 -to sdClock
set_location_assignment PIN_E11 -to i_n_CardDet
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to i_n_CardDet
set_location_assignment PIN_L9 -to driveLED
# SDRAM
set_location_assignment PIN_P2 -to sdRamClk
set_location_assignment PIN_R1 -to sdRamClkEn
set_location_assignment PIN_M7 -to n_sdRamCas
set_location_assignment PIN_P8 -to n_sdRamCe
set_location_assignment PIN_M8 -to n_sdRamRas
set_location_assignment PIN_P6 -to n_sdRamWe
set_location_assignment PIN_R7 -to sdRamAddr[0]
set_location_assignment PIN_T7 -to sdRamAddr[1]
set_location_assignment PIN_R8 -to sdRamAddr[2]
set_location_assignment PIN_T8 -to sdRamAddr[3]
set_location_assignment PIN_R6 -to sdRamAddr[4]
set_location_assignment PIN_T5 -to sdRamAddr[5]
set_location_assignment PIN_R5 -to sdRamAddr[6]
set_location_assignment PIN_T4 -to sdRamAddr[7]
set_location_assignment PIN_R4 -to sdRamAddr[8]
set_location_assignment PIN_T3 -to sdRamAddr[9]
set_location_assignment PIN_T6 -to sdRamAddr[10]
set_location_assignment PIN_R3 -to sdRamAddr[11]
set_location_assignment PIN_T2 -to sdRamAddr[12]
set_location_assignment PIN_N8 -to sdRamAddr[13]
set_location_assignment PIN_L8 -to sdRamAddr[14]
set_location_assignment PIN_K5 -to sdRamData[0]
set_location_assignment PIN_L3 -to sdRamData[1]
set_location_assignment PIN_L4 -to sdRamData[2]
set_location_assignment PIN_K6 -to sdRamData[3]
set_location_assignment PIN_N3 -to sdRamData[4]
set_location_assignment PIN_M6 -to sdRamData[5]
set_location_assignment PIN_P3 -to sdRamData[6]
set_location_assignment PIN_N5 -to sdRamData[7]
set_location_assignment PIN_N2 -to sdRamData[8]
set_location_assignment PIN_N1 -to sdRamData[9]
set_location_assignment PIN_L1 -to sdRamData[10]
set_location_assignment PIN_L2 -to sdRamData[11]
set_location_assignment PIN_K1 -to sdRamData[12]
set_location_assignment PIN_K2 -to sdRamData[13]
set_location_assignment PIN_J1 -to sdRamData[14]
set_location_assignment PIN_J2 -to sdRamData[15]
# 
set_location_assignment PIN_R13 -to IO_PIN[16]
set_location_assignment PIN_T13 -to IO_PIN[17]
set_location_assignment PIN_T15 -to IO_PIN[18]
set_location_assignment PIN_T14 -to IO_PIN[19]
set_location_assignment PIN_N12 -to IO_PIN[20]
set_location_assignment PIN_L15 -to IO_PIN[29]
set_location_assignment PIN_L16 -to IO_PIN[30]
set_location_assignment PIN_N13 -to IO_PIN[21]
set_location_assignment PIN_R14 -to IO_PIN[22]
set_location_assignment PIN_P14 -to IO_PIN[23]
set_location_assignment PIN_N14 -to IO_PIN[24]
set_location_assignment PIN_R16 -to IO_PIN[25]
set_location_assignment PIN_P16 -to IO_PIN[26]
set_location_assignment PIN_N15 -to IO_PIN[27]
set_location_assignment PIN_N16 -to IO_PIN[28]
set_location_assignment PIN_M12 -to IO_PIN[31]
set_location_assignment PIN_P15 -to IO_PIN[32]
set_location_assignment PIN_L13 -to IO_PIN[33]
set_location_assignment PIN_L14 -to IO_PIN[34]
set_location_assignment PIN_K15 -to IO_PIN[35]
set_location_assignment PIN_K16 -to IO_PIN[36]
set_location_assignment PIN_J12 -to IO_PIN[37]
set_location_assignment PIN_K12 -to IO_PIN[38]
set_location_assignment PIN_J13 -to IO_PIN[39]
set_location_assignment PIN_J14 -to IO_PIN[40]
set_location_assignment PIN_J11 -to IO_PIN[41]
set_location_assignment PIN_K11 -to IO_PIN[42]
set_location_assignment PIN_F11 -to IO_PIN[43]
set_location_assignment PIN_G11 -to IO_PIN[44]
set_location_assignment PIN_F14 -to IO_PIN[45]
set_location_assignment PIN_F13 -to IO_PIN[46]
set_location_assignment PIN_F9 -to IO_PIN[47]
set_location_assignment PIN_F10 -to IO_PIN[48]
#
set_location_assignment PIN_M15 -to J3_IO[0]
set_location_assignment PIN_M16 -to J3_IO[1]
set_location_assignment PIN_E16 -to J3_IO[2]
set_location_assignment PIN_E15 -to J3_IO[3]
set_location_assignment PIN_D16 -to J3_IO[4]
set_location_assignment PIN_D15 -to J3_IO[5]
#
set_location_assignment PIN_R9 -to CPU_E
set_location_assignment PIN_T9 -to n_CPU_Res
set_location_assignment PIN_R10 -to CPU_MX
set_location_assignment PIN_T10 -to CPU_CLK
set_location_assignment PIN_R11 -to CPU_BusEnable
set_location_assignment PIN_T11 -to CPU_NMIB
set_location_assignment PIN_R12 -to CPU_RWB
set_location_assignment PIN_T12 -to CPU_IRQB
set_location_assignment PIN_N9 -to CPU_VDA
set_location_assignment PIN_M9 -to CPU_ABORTB
set_location_assignment PIN_M10 -to CPU_VPA
set_location_assignment PIN_P9 -to CPU_RDY
set_location_assignment PIN_P11 -to CPU_VPB
set_location_assignment PIN_N11 -to CPU_MLB

Revision History

Rev 2

• Fixed W65C816 footprint
  • Bigger footprint
  • Moved around a lot of tracks to remove ground trace and use ground plane
• Changed from 2:2:2 to 3:3:2 bit video (256 colors)
• Changed J1 pinout to not use (2) input-only J8 pins
• Shuffled J7 pinout to add video bits
• Shuffled J8 to skip Cyclone 10 input-only pins
  • Moved to J3 (now has 4 input-only pins and 2 I/O pins)

Rev 1

• RETRO-65C816 Rev 1
• W65C816 footprint is too small for part
  • Used TQFP footprint but part is clearly too big
  • Datasheet does not indicate package detail
  • 0.8mm pitch was OK
• Works well as RETRO-EP4CE15 replacement
  • PS/2 @5V is good

Videos

• 65C816 Computer 27 Videos Series - Adrien Kohlbecker
  • Lot of detail on 65C816 hardware

Assembly Sheet

• RETRO-65C816 Rev 1 Assembly Sheet