Tag: voltage monitor

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Showing 2 products.

Status Product What it does Compatibility Links

Status	Product	What it does	Compatibility	Links
Check statusChecked Jul 30, 2026	Commodore 1501 Power Monitor Familyby Independent Australian builder power monitor voltage monitor user port reset button c64 vic 20 c128 plus 4	External displays for checking the 5 VDC and 9 VAC outputs of Commodore power supplies, with the MkII adding current measurement under load. The exact review was published in March 2020 and a February 2023 comment says the seller was still making the monitors. The review describes an unofficial Commodore-styled product made by an unnamed Australian builder, not a verified Commodore-manufactured accessory. A current-looking Pocket 1501 eBay route failed exact Tavily extraction and failed again after the required 60-second retry under WF-068, so its maker, stock, price, package, and relationship to MkI and MkII remain unverified. The separate FDD II drive-supply monitor is not folded into this host-monitor family. This device displays readings; no automatic cutoff, regulation, over-voltage clamp, fuse, or other protective action was verified. Sources Lyonsden Commodore 1501 Power Monitor MkII review C64 OS Buyer's Guide	Commodore 64 Exact model Commodore VIC-20 Exact model Commodore 128 Exact model Commodore Plus/4 Exact model	Commodore 1501 Power Monitor MkII review Pocket 1501 marketplace route
AvailableChecked Jul 30, 2026	Electroware Cassette Port Voltmeterby Electroware power monitor voltage monitor cassette port c64 vic 20 c128	A calibrated cassette-port display that measures the computer's live 5 V rail while preserving the Datasette connection. Electroware listed the factory-calibrated meter at EUR 18.99 with dispatch in three to five days on 2026-07-30. It measures the live 5 VDC rail only. It does not display 9 VAC, apply a test load, regulate voltage, or automatically disconnect a failing supply. Sources Electroware cassette-port voltmeter listing C64 OS Buyer's Guide	Commodore 64 Exact model Commodore VIC-20 Exact model Commodore 128 Exact model	Buy the Electroware voltmeter

Check statusChecked Jul 30, 2026

Commodore 1501 Power Monitor Familyby Independent Australian builder

External displays for checking the 5 VDC and 9 VAC outputs of Commodore power supplies, with the MkII adding current measurement under load.

The exact review was published in March 2020 and a February 2023 comment says the seller was still making the monitors. The review describes an unofficial Commodore-styled product made by an unnamed Australian builder, not a verified Commodore-manufactured accessory. A current-looking Pocket 1501 eBay route failed exact Tavily extraction and failed again after the required 60-second retry under WF-068, so its maker, stock, price, package, and relationship to MkI and MkII remain unverified. The separate FDD II drive-supply monitor is not folded into this host-monitor family. This device displays readings; no automatic cutoff, regulation, over-voltage clamp, fuse, or other protective action was verified.

Sources

Commodore 64 Exact model
Commodore VIC-20 Exact model
Commodore 128 Exact model
Commodore Plus/4 Exact model

Commodore 1501 Power Monitor MkII review Pocket 1501 marketplace route

AvailableChecked Jul 30, 2026

Electroware Cassette Port Voltmeterby Electroware

A calibrated cassette-port display that measures the computer's live 5 V rail while preserving the Datasette connection.

Electroware listed the factory-calibrated meter at EUR 18.99 with dispatch in three to five days on 2026-07-30. It measures the live 5 VDC rail only. It does not display 9 VAC, apply a test load, regulate voltage, or automatically disconnect a failing supply.

Sources

Commodore 64 Exact model
Commodore VIC-20 Exact model
Commodore 128 Exact model

Buy the Electroware voltmeter