HardLabs

Ql flex memory

arleybls·ql-flex-memory

Ql flex memory PCB layout, top view — open source board by arleybls

About the Ql flex memory PCB

Ql flex memory is an open source PCB design by arleybls, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 97.8 × 35.6 mm, with 15 components from 11 distinct parts.

Other key parts include the HM628512BLFP-7, GAL16V8B-25QP and LM1117-5.0. By type, the board carries 4 capacitors, 3 ICs, 3 jumpers, 3 resistors and 2 connectors.

It belongs with the retro computing designs in this gallery.

From the project

512kB external RAM expansion board for the Sinclair QL, with SuperBASIC/68008 RAM test software (KiCad, CERN-OHL-S v2)

A 512kB external RAM expansion for the Sinclair QL, based on Alvaro Alea Fernandez's design. The circuit is unchanged. This version reworks the board to make assembly and reconfiguration easier, hence the name.

Original project: https://github.com/alvaroalea/QL512kbExternal_Expansion

Standard 2.54mm pin headers replace the configuration solder jumpers. Jumper caps now control the memory configuration and Trump Card mode. The GAL16V8 uses a PLCC-20 SMD socket instead of a DIP-20 through-hole package. The GAL remains removable and reprogrammable while taking up less board space. The resistors…

Ql flex memory, from the project README
From the project README

Main components on the Ql flex memory

HM628512BLFP-7GAL16V8B-25QPLM1117-5.0

Ql flex memory bill of materials (BOM)

15 components, 11 distinct parts.

QtyPartRefs
1
HM628512BLFP-7
U1
1
GAL16V8B-25QP
U2
1
LM1117-5.0
U3
1
QL_SLOT_DIN41612_FEMALE-90degrees
J1
1
QL_SLOT_DIN41612_MALE_90degrees
J2
2
Conn_01x02_Pin
JP1, JP2
1
Conn_01x03_Pin
JP3
1
100u/25V
C1
1
100u/16V
C2
2
100n
C3, C4
3
10K
R1, R2, R3

Ql flex memory design files

The KiCad project lives in the arleybls/ql-flex-memory repository on GitHub; these links point at the commit this page was built from.

Ql flex memory: common questions

How big is the Ql flex memory PCB?

The Ql flex memory measures 97.8 × 35.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Ql flex memory?

15 components, from 11 distinct parts. The full bill of materials is listed on this page.

Where can I download the Ql flex memory design files?

From the arleybls/ql-flex-memory repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Ql flex memory design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which arleybls chose for the repository.

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