Sinclair QL Service Manual

R105 1K 1K (2) 5%, 1/4W
R106 1K 1K (2) 5%, 1/4W
JU1-6 ZERO Ω - (3)
DIODES
D1-D17 1N4148
As Issue 5
D20 LD235R RED LED SIFAM
D21 LD235R RED LED SIFAM
D25 BA157
D26 BA157
D27 LD235Y YELLOW LED SIFAM
D28 1N4148
D29 1N4148
TRANSISTORS
TR1 BC184
As Issue 5
(4)
TR2 ZTX510/BSX29-SGS
TR3 BC184 (4)
TR4 BC184 (4)
TR5 RC184 (4)
TR6 ZTX551
TR7 ZTX551
TR8 ZTX313/MPS2369
TR9 ZTX313/HPS2369
INTEGRATED CIRCUITS
IC1-16
HM4864P-2
As Issue 5
Alternatives
Hitachi
TMS4164-15NL Texas
MCM6665AP15 Motorola
MK4564N15 Mostek
UPD4164C-3 NEC
MSM3764-15RS OKI
TMS4146-12NL Texas
HYB4164P2BD SIE
IC17 74LS00 (5)
IC18 MC68008 Motorola
IC19, IC20 74LS257 NOT Nat. Semi
IC21 74LS245 NOT Nat. Semi
IC22 ZX8301 Plessey/Sinclair
IC23 ZX8302 NCR/Sinclair
IC24 8049 NEC
IC25 1488
IC26 1489A
IC27 74LS03
IC28 MC1377P MC1377P Motorola
IC33 23256 (2) 32k ROM, JM Mask
IC34 23128 23128 (2) 16k ROM, JM Mask
IC36 79L12 79L12 -12V Regulator
IC37 78L12 78L12 +12V Regulator
IC38 - HAL16L8 (6) Sinclair
CONNECTORS
J1 64-way
As Issue 5
Viking, Euro connector A/B
J2 30-way Edge connector
J3, J4 603A LH BICC, BT type
J5, J6 603A RH BICC, BT type
J7 Jack 8-pin DIN
J8 3-pin Skt Phillips, Mains
J9, J10 Jack Single pol, NC

Sinclair QL Specifications

General

Processor	Motorola 68008
Clock Speed	7.5 MHz
RAM	128 KB (expandable to 640 KB)
ROM	48 KB
Operating System	Sinclair QDOS
Release Year	1984
Storage	Microdrive tape loop
Graphics	256x256 pixels, 8 colors
Ports	RS-232, ROM cartridge
Sound	Beeper (internal speaker)