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6 layers244 × 244 mmRetroslop, the printed circuit board in 3D

Retroslop

CPTforever/8088-MicroATX-Computer

A 8088 based, IBM 5150 like computer compatible with the MicroATX motherboard form factor.

Open in PCBKitView on GitHub.kicad_pcb
Size
244 × 244 mm
Copper layers
6
Thickness
1.53 mm
Parts
193
Nets
394
Pads
1,654
Tracks, vias
5,375, 734
Pours
2
Routed
Yes
KiCad
KiCad 10.0 (file 20260206)
Created
1 Jul 2026
Updated
30 Jul 2026

Overview

Retroslop is an open-source printed circuit board by CPTforever, from the CPTforever/8088-MicroATX-Computer repository on GitHub. It is a 6-layer board of 244 × 244 mm with 193 parts on 394 nets, routed with 5,375 tracks and 734 vias.

It is built around the 74LS245SC, 74LS373SC and MAX232N, with the LM386, USBLC6-2SC6 and 74LS00SC among its other parts. Its parts include 84 capacitors, 51 ICs, 31 resistors, 10 connectors and 2 switches.

Main components

12

README

README.md

Insert header here

pcb_front pcb_back schematic

Features!

insert features

Memory Map

Insert memory map

I/O Port Map

Insert port map

Rev 1 Mistakes

UART Controller uses system clock instead of external crystal, meaning standard baud rates are only achievable when system clock uses a UART compatible crystal

PIT Gate 1 does not have a pull up resistor, meaning gate is floating when the external io pin is not connected. (This can be bodged with a radial resistor at least.)

Parts

193
QtyValueFootprintReferences
520.1 μFCapacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolderC17, C18, C19, C20, C21, C22, C29, C30, C31, C32, C33, C34, C35, C36, C37, C38 +36
174.7k ΩResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, R37, R38, R39, R40, R42 +1
1210 μFCapacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolderC87, C88, C89, C91, C92, C93, C94, C95, C96, C97, C98, C99
933 ΩResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR44, R45, R46, R47, R48, R49, R50, R51, R52
9MountingHoleMountingHole:MountingHole_4mmH1, H2, H3, H4, H5, H6, H7, H8, H9
51 μFCapacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolderC52, C67, C68, C69, C86
574LS245Package_DIP:DIP-20_W7.62mm_SocketU9, U21, U27, U28, U47
574LS373Package_DIP:DIP-20_W7.62mm_SocketU18, U19, U20, U35, U50
410 uFCapacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolderC11, C15, C23, C24
447 pFCapacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolderC50, C70, C71, C83
474LS244Package_DIP:DIP-20_W7.62mm_SocketU31, U48, U55, U56
4Bus_ISA_8bitLibrary:655308435J1, J2, J3, J4
3USBLC6-2SC6Package_TO_SOT_SMD:SOT-23-6U36, U38, U44
2100 μFCapacitor_THT:CP_Radial_D6.3mm_P2.50mmC7, C8
247nFCapacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolderC5, C6
2510 ΩResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR20, R21
274LS00Package_DIP:DIP-14_W7.62mm_SocketU1, U4
274LS04Package_DIP:DIP-14_W7.62mm_SocketU22, U37
274LS138Package_DIP:DIP-16_W7.62mm_SocketU5, U6
274LS175Package_DIP:DIP-16_W7.62mm_SocketU32, U41
274LS30Package_DIP:DIP-14_W7.62mm_SocketU3, U8
2AS6C4008-55PCNPackage_DIP:DIP-32_W15.24mm_SocketU7, U12
2N6L30T3N-103-3030Library:N6L30T3N1033030VR1, VR2
110 ΩResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR53
11000 uFCapacitor_THT:CP_Radial_D8.0mm_P3.50mmC1
114.318 MHzCrystal:Crystal_HC49-4H_VerticalY2
116550Package_DIP:DIP-40_W15.24mm_SocketU42
1220 ΩResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR36
1330 ΩResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR41
147 nFCapacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolderC2
174LS02Package_DIP:DIP-14_W7.62mm_SocketU2
174LS06Package_DIP:DIP-14_W7.62mm_SocketU46
174LS10Package_DIP:DIP-14_W7.62mm_SocketU24
174LS20Package_DIP:DIP-14_W7.62mm_SocketU29
174LS273Package_DIP:DIP-20_W7.62mm_SocketU54
174LS32Package_DIP:DIP-14_W7.62mm_SocketU17
174LS670Package_DIP:DIP-16_W7.62mm_SocketU30
174LS74Package_DIP:DIP-14_W7.62mm_SocketU10
18087Package_DIP:DIP-40_W15.24mm_SocketU15
18088_Max_ModePackage_DIP:DIP-40_W15.24mm_SocketU14
18254Package_DIP:DIP-24_W15.24mm_SocketU33
18255APackage_DIP:DIP-40_W15.24mm_SocketU40
18259APackage_DIP:DIP-28_W15.24mm_SocketU16
18284Package_DIP:DIP-18_W7.62mm_SocketU13
18288Package_DIP:DIP-20_W7.62mm_SocketU23
182C37APackage_LCC:PLCC-44_THT-SocketU34
1ATX-24Library:39-28-1243J8
1CVS-1508Library:CVS-1508LS1
1Conn_02x14_Odd_EvenConnector_PinSocket_2.54mm:PinSocket_2x14_P2.54mm_HorizontalJ7
1DE9_SocketLibrary:L717SDE09PA4CH4RC309J5
1DS12C887+Library:DIP1550W53P254L3378H1042Q24NIC1
1FPU JUMPERConnector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_VerticalJ12
1JZ300Library:JZ300C14
1KMDGX-6SG_P-S4NLibrary:KMDGX6SGPS4NJ10
1LEDLED_THT:LED_D5.0mm_ClearD2
1LM386Package_DIP:DIP-8_W7.62mm_SocketU25
1MAX232Package_DIP:DIP-16_W7.62mm_SocketU43
1Power JumperConnector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_VerticalJ13
1Power SwitchLibrary:1080041EVXS1
1SST39SF010Socket:DIP_Socket-32_W11.9mm_W12.7mm_W15.24mm_W17.78mm_W18.5mm_3M_232-1285-00-0602JU26
1TS02-66-50-BK-260-SCR-DLibrary:TS026650BK260SCRDS2
1VT82C42Package_DIP:DIP-40_W15.24mm_SocketU11
1WC1602ADisplay:WC1602ADS2

Questions

How big is the Retroslop PCB?

It measures 244 × 244 mm and has 6 copper layers, 1.53 mm thick.

What parts does the Retroslop use?

193 parts, built around the 74LS245SC, 74LS373SC, MAX232N and LM386. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Retroslop KiCad files?

From the CPTforever/8088-MicroATX-Computer repository on GitHub, at the commit this page was made from: the board is kicad/retroslop.kicad_pcb and its schematic kicad/device_decoder.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Retroslop design in my own project?

Its repository states no licence, so its author keeps all rights: ask CPTforever before reusing the design.

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