vLA1 - Sinclair ZX Interface 1 ULA Replacement

Name: vLA1 - Sinclair ZX Interface 1 ULA Replacement
SKU: 16767
Price: 38.00 USD
Availability: InStock
Rating: 5.00 (1 reviews)

(1 Review)

The vLA1 is a pin-for-pin functional replacement for the Sinclair ZX Interface 1 ULA

Designed by Charlie Ingley in New Zealand

vLA1 - Sinclair ZX Interface 1 ULA Replacement 1

vLA1 - Sinclair ZX Interface 1 ULA Replacement 2

vLA1 - Sinclair ZX Interface 1 ULA Replacement 3

vLA1 - Sinclair ZX Interface 1 ULA Replacement 4

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The vLA1 is a pin-for-pin functional replacement for the Sinclair ZX Interface 1 ULA

What is it? The vLA1 is a pin-for-pin functional replacement for the Sinclair ZX Interface 1 ULA using a modern programmable logic array. The vLA1 provides full support for the Microdrive, RS-232 and…

What is it?

The vLA1 is a pin-for-pin functional replacement for the Sinclair ZX Interface 1 ULA using a modern programmable logic array. The vLA1 provides full support for the Microdrive, RS-232 and Sinclair Network as in the original ULA.

The vLA1 comes in a 40 pin DIL package suitable for soldering into the Interface 1 PCB. A word of caution, however, due to a lack of room within the Interface 1 case, the original ULA will need to be desoldered and the vLA1 installed in its place. There is simply not enough room for a socket. Have a look through the install guide (see the external documentation link elsewhere on this page) and you should get a good idea of what's involved.

The image gallery shows the vLA1 in place on the Interface 1 PCB. Note that the Interface 1 is not included in this offer.

Why did you make it?

The original ULA has an unfortunate history of being prone to spectacularly overheat and fail without warning, leaving an unsightly crater in the Interface 1 plastic case. Because of this, and due to the original ULA now becoming hard to find, the vLA1 project was born.

What makes it special?

The original ULA functionality has been reverse engineered and is replicated in full.

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Charlie Ingley Shipping Policy:

UK Customers please note: Due to Tindie not collecting VAT for UK customers at checkout I am unable to ship to the UK from this store. I do however have an alternate sales channel that does sell directly to UK customers. Please contact me on sales@vretrodesign.com for more information.

New Zealand buyers only! Please be aware that the Tindie prices do not include GST. This will add 15% to the listed price (not including shipping which has GST already included). As a GST registered company, resident in New Zealand, I am legally required to collect GST on purchases within New Zealand. I will contact you upon purchase with details on how the GST amount can be settled.

Note that I do have an alternate sales channel that does sell directly to NZ customers with GST collected at checkout. Please contact me on sales@vretrodesign.com for more information.

Review Breakdown

Average Ratings

Product: (5.00)

Documentation: (5.00)

Shipping: (5.00)

Communication: (5.00)

Zoltán | Oct. 15, 2020

One ZX Interface 1 saved thanks to vLA1

Shipping was unexpectedly fast to Hungary. The documentation was very straightforward and to the point on how to replace the ULA in the IF1. After replacing the faulty ZX IF1 ULA with vLA1, my ZX Microdrive magically started working. I also tested it with a vDriveZX (not inside a case yet) and it also worked nicely.