Sinclair ZX80 / ZX81 / Z88 Forums

ZX-81 MICRO RTTY

• RESET button

• BAUD toggle switch 45.5 | 50.0

• 25-pin KEYBOARD connector DB25

Nuclear Power Station briefcase?

eBay: Sinclair ZX81 + PSU in metal carry case GBP 326.40

A well designed industrial enclosure for the ZX81. Looks to be done right -- at the least, it has passed an Electrical Safety Test. Rugged aluminium case with all ZX81 connectors passed to the case for external use

with uncased RAM PACK attached to rear of ZX81 Looks like the TV out is going to the BNC connector


BOTTOM: rubber feet and two screws going into the aluminium case to hold the noise filter BACK

• Sticker: 'PASSED Electrical Safety Test'

• TTL OUT jack RCA

• TTL IN jack RCA

• 3 small jacks (EAR,MIC,9V DC)

• BNC connector

• C13 power connector

tight fitting metal lid to keep RF in. Would this cause the ZX81 to overheat? There are two screws, one on each side, to secure the lid


UK1200 power supply output wired thru RESET button
Sinclair UK 1200 power adapter connected to back-panel C13 connector via AC noise filter 9009915-C1
CORNELL DUBILIER
RADIO NOISE FILTER
NF 20968-3
2X3A 250 VAC

David G wrote: ↑Thu Apr 24, 2025 9:27 am tight fitting metal lid to keep RF in. Would this cause the ZX81 to overheat?

Aluminium is a good conductor of heat. The large surface area of the aluminium case may be enough cooling for this arrangement.

Mark