Issue 6

Sinclair QL - Schematics & PCB

Schematic, PCB of the Sinclair QL Computer

(C) 2024 Alvaro Alea Fdz.

License under: CERN Open Hardware Licence Version 2 - Strongly Reciprocal

https://ohwr.org/cern_ohl_s_v2.txt

Folder: Issue_6

This folder contain the schematic of the original Issue 6 of sinclair QL, from pictures found on internet.

STATUS

• Schematic - 100% draw, ERC passed
• PCB - 100% draw, ERC passed
• NOT TESTED

TODO

• Check a Read PCB.

Folder: Issue_5

This folder contain the schematic of the Issue 5

STATUS

• Schematic - 99% draw, ERC passed
• PCB - 99% draw, ERC passed incomplete, component side is 99%, at least 1 track missing, solder side is 100%, but 1 aditional track was need to complete the schematic.
• NOT TESTED

Folder: Issue_2

Future schematic of the Issue 2

STATUS

• Schematic - 0% not evaluated.
• PCB - 5% draw, incomplete, actually based on Issue 6, Got Good Picture of Solder side (90% Cover) and data from componentes (about 25%)
• INCOMPLETE, NOT TESTED

Folder: Issue_7ALEA

Future schematic & PCB of a improved Sinclair QL with moderm components.

STATUS

• Schematic - 100% draw, ERC Passed
• PCB - 100% draw, ERC passed
• NOT TESTED

DONE

• Change VCC track to GND to enhaced microdrive operation (mandatory mod. of service manual)
• Incorporate R107,108 on PCB, not need to solder over ZX8302
• Incorporate 5 diodes on PCB, not need to solder over ZX8301 to protect it

TODO

• Other mod of service manual
• Aereal componentes
• Other mod by german issues
• replace mc1488 y mc1489 by max232
• replace serial conector by DB9
• replace RAM by 4x (64x8) chips (Spectrum +2A)

GOOD IDEAS

• replace ROM by ssf39a40 (512Kb)
• remove Composite out and RGB and replace by VGA (rp2040)
• split microdrive and power supply circuits
• remplace 68008 by 68020 at 15Mhz.
• Add 2x 512Kb sram (16bits access with 68020)
• Add floppy interface
• Add RTC
• Add rp2040 for USB keyboard
• Add Qimsi mouse (using same rp2040 of keyboard?)

FRIKI

• Add 2x 1024Kb sram (16bits access with 68020)
• Add a PSG
• Add qubide interface
• Add footprint for Lion's ZX8301 replacement