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motherboard.sch
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EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 8268 11693 portrait
encoding utf-8
Sheet 1 29
Title "Converted schematics of Atari STE"
Date "2021-08-31"
Rev "1.0.0"
Comp ""
Comment1 "Reference : C300780-001"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
Text Notes 750 2200 0 157 ~ 0
Sheet 1
$Sheet
S 800 2400 2000 150
U 6089D0C6
F0 "U100 — MC68000" 71
F1 "subsheet_100.sch" 50
$EndSheet
$Sheet
S 800 2800 2000 150
U 6089D0BA
F0 "U101 — Blitter" 71
F1 "subsheet_101.sch" 50
$EndSheet
$Sheet
S 800 3200 2000 150
U 6089D0BC
F0 "U102 U103 — EPROMs" 71
F1 "subsheet_102.sch" 50
$EndSheet
$Sheet
S 800 3600 2000 150
U 6089D0BE
F0 "J103 - Cartridge port" 71
F1 "subsheet_103.sch" 50
$EndSheet
$Sheet
S 800 4000 2000 150
U 6089D0C0
F0 "U104 — Reset circuit" 71
F1 "subsheet_104.sch" 50
$EndSheet
$Sheet
S 800 4400 2000 150
U 6089D0C2
F0 "J100 — Power connector" 71
F1 "subsheet_105.sch" 50
$EndSheet
$Sheet
S 800 4800 2000 150
U 6089D0C4
F0 "32MHz + PAL subcarrier" 71
F1 "subsheet_106.sch" 50
$EndSheet
Text Notes 3100 2200 0 157 ~ 0
Sheet 2
$Sheet
S 3150 2400 2000 150
U 608A2359
F0 "U200 — Acia 1 to MIDI IO" 71
F1 "subsheet_200.sch" 50
$EndSheet
$Sheet
S 3150 2800 2000 150
U 608C2344
F0 "U201 — Acia 2 to IKBD IO" 71
F1 "subsheet_201.sch" 50
$EndSheet
$Sheet
S 3150 3200 2000 150
U 608EA3C9
F0 "U202 — PSG and Parallel IO" 71
F1 "subsheet_202.sch" 50
$EndSheet
$Sheet
S 3150 3600 2000 150
U 60964369
F0 "U203 — MFP 68901" 71
F1 "subsheet_203.sch" 50
$EndSheet
$Sheet
S 3150 4000 2000 150
U 609B5A51
F0 "J204 — RS-232 IO" 71
F1 "subsheet_204.sch" 50
$EndSheet
$Sheet
S 3150 4400 2000 150
U 609D3E52
F0 "U204 U205 — G12V -12V -5V" 71
F1 "subsheet_205.sch" 50
$EndSheet
Text Notes 5500 2200 0 157 ~ 0
Sheet 3
$Sheet
S 5500 2400 2000 150
U 60A1445F
F0 "U300 — DMA" 71
F1 "subsheet_300.sch" 50
$EndSheet
$Sheet
S 5500 2800 2000 150
U 60A73CDE
F0 "J301 — ACSI Port" 71
F1 "subsheet_301.sch" 50
$EndSheet
$Sheet
S 5500 3200 2000 150
U 60AD8617
F0 "U301 — WD1772 and port" 71
F1 "subsheet_302.sch" 50
$EndSheet
$Sheet
S 5500 3600 2000 150
U 60ABB05E
F0 "U303 — SCLK & CLK2 clocks" 71
F1 "subsheet_303.sch" 50
$EndSheet
Text Notes 750 5700 0 157 ~ 0
Sheet 4
$Sheet
S 800 5900 2000 150
U 60AD332C
F0 "U400 — GSTMCU" 71
F1 "subsheet_400.sch" 50
$EndSheet
$Sheet
S 800 6300 2000 150
U 60AD33B6
F0 "U401 — GST Shifter" 71
F1 "subsheet_401.sch" 50
$EndSheet
$Sheet
S 800 6700 2000 150
U 60B3D9E3
F0 "J400 — Video Port" 71
F1 "subsheet_402.sch" 50
$EndSheet
$Sheet
S 800 7100 2000 150
U 60B8B7AD
F0 "PAL/NTSC encoding or CSYNC" 71
F1 "subsheet_403.sch" 50
$EndSheet
Text Notes 3100 5700 0 157 ~ 0
Sheet 5
$Sheet
S 3150 5900 2000 150
U 60C451BA
F0 "J500 J501 — Gamepad ports" 71
F1 "subsheet_500.sch" 50
$EndSheet
$Sheet
S 3150 6300 2000 150
U 60C60FDB
F0 "U509~~U512 — Gamepad control" 63
F1 "subsheet_501.sch" 50
$EndSheet
$Sheet
S 3150 6700 2000 150
U 60C95DE8
F0 "U500~~U503 - DMA Sound DAC" 63
F1 "subsheet_502.sch" 50
$EndSheet
$Sheet
S 3150 7100 2000 150
U 60CC3B10
F0 "U504~~U507 — Sound amp. & filter" 63
F1 "subsheet_503.sch" 50
$EndSheet
$Sheet
S 3150 7500 2000 150
U 60CD36E9
F0 "U508 — Sound mix and output" 71
F1 "subsheet_504.sch" 50
$EndSheet
Text Notes 5500 5700 0 157 ~ 0
Sheet 6
$Sheet
S 5500 5900 2000 150
U 60CE6C60
F0 "U600~~U603 – RAM modules" 71
F1 "subsheet_600.sch" 50
$EndSheet
$Sheet
S 5500 6300 2000 150
U 60D5A91C
F0 "E[0..7] — Jumper pads" 71
F1 "subsheet_601.sch" 50
$EndSheet
Text Notes 2400 2500 0 55 ~ 0
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Table of content
Text Notes 800 8900 0 79 ~ 0
Note : some mods aimed to troubleshoot some problems are \nadded as comment (text + graphics) at the relevant location.\n\n- DMA pull-up on databus (done on the floppy disc controller U301)\n- WD1772 pull-ups (done on U305)\n- LMC audio mix fix (done near U508)\n- RGB Video ghosting fix (done at C411)\n- C415 should be reversed\n
$EndSCHEMATC