Make this my favourite vLA81 : A replacement for the Sinclair ZX81 ULA

Category:
Retro Computers >> Sinclair >> Sinclair ZX81 >> Components
Listing type:
Fixed Price Multiple Items
Item Condition:
New
Seller location:
Katikati, New Zealand
Ending in:
This listing is closed (21/10/2019)

Notify When Back in Stock
Quantity Available
0
Latest buyer:
a***o (7)
Fixed price:
£18.95
Shipping Costs:
From only £2.00
Payment methods:
Paypal
Number Sold:
48 (View history)
Buyer Value Date and hour Quantity bought
a***o (7) £18.95 21/10/2019 08:31:45 1
g***f (11) £18.95 19/10/2019 09:18:40 1
T***6 (20) £18.95 15/10/2019 06:05:45 1
Z***d (2) £18.95 13/10/2019 09:22:30 1
S***9 (9) £18.95 06/10/2019 16:32:15 1
e***e (1) £18.95 30/09/2019 21:39:31 1
d***e (13) £18.95 30/09/2019 15:54:04 1
Z***e (1) £18.95 26/09/2019 09:24:33 1
T***n (2) £18.95 25/09/2019 14:54:49 1
b***a (44) £18.95 24/09/2019 21:14:52 1
j***1 (2) £18.95 23/09/2019 18:44:03 1
b***d (7) £18.95 22/09/2019 19:17:25 1
d***s (7) £18.95 21/09/2019 13:58:18 1
a***a (7) £18.95 21/09/2019 09:00:43 1
a***o (7) £18.95 20/09/2019 19:37:01 1
C***R (1) £18.95 20/09/2019 08:02:22 1
w***d (3) £18.95 19/09/2019 12:58:53 1
p***4 (16) £18.95 18/09/2019 13:25:57 1
z***o (5) £18.95 07/09/2019 23:24:17 1
f***1 (1) £18.95 06/09/2019 10:34:36 1
p***l (6) £18.95 03/09/2019 14:24:01 1
j***8 (10) £18.95 01/09/2019 12:48:27 1
d***h (16) £18.95 20/08/2019 00:20:50 1
1***K (123) £18.95 14/08/2019 22:56:03 1
L***n (51) £18.95 14/08/2019 20:05:17 1
P***s (83) £18.95 14/08/2019 16:39:53 1
n***l (9) £18.95 14/08/2019 15:52:01 1
p***o (4) £37.90 14/08/2019 14:52:10 2
A***g (1) £18.95 12/08/2019 10:20:34 1
d***2 (17) £18.95 11/08/2019 19:50:51 1
H***S (7) £18.95 11/08/2019 13:29:56 1
J***m (4) £18.95 11/08/2019 12:36:16 1
b***u (6) £18.95 10/08/2019 19:59:39 1
a***7 (8) £18.95 09/08/2019 11:04:44 1
j***r (1) £37.90 07/08/2019 22:31:10 2
b***i (11) £18.95 06/08/2019 21:19:38 1
a***s (6) £18.95 05/08/2019 15:32:50 1
K***k (66) £18.95 05/08/2019 07:39:31 1
h***h (2) £37.90 05/08/2019 07:06:30 2
a***a (73) £18.95 04/08/2019 17:36:30 1
F***p (39) £18.95 04/08/2019 17:09:13 1
F***l (6) £18.95 04/08/2019 12:17:13 1
J***3 (24) £37.90 03/08/2019 12:41:40 2
j***5 (1) £18.95 03/08/2019 12:32:24 1
Feedback on this Item
PositivePositive Z***e (1) Correct trusted partner. I recommend to everyone. 18/10/2019 09:06:48
PositivePositive b***a (44) All ok! 13/10/2019 19:04:38
PositivePositive b***d (7) 12/10/2019 22:56:05
PositivePositive a***a (7) Great hw, perfect transaction 20/10/2019 16:20:29
PositivePositive L***n (51) Excellent ULA. Works a treat. 17/10/2019 13:40:30
PositivePositive p***o (4) very ok , good working
Seller's Response
Thanks for the feedback!
14/09/2019 19:35:30
PositivePositive a***a (73) Sorry for delay, wanted to use it before feedback. Packed well, amazing piece of kit, extremely well constructed, nice design. nice features. Thanks
Seller's Response
Thanks Andy!
13/09/2019 15:06:41
PositivePositive J***3 (24) Perfect, works fine!
Seller's Response
Thanks for the feedback!
01/09/2019 18:15:58

Item Number : 38492

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Description

The vLA81 is a modern plugin replacement for the ZX81 ULA. It is one of several ULA replacements I have made for members of the Sinclair computer family including the vLA82 for the Spectrum 48K, the vLA128 for the Spectrum 128K (Toastrack) and +2 (Grey case) and the vLA1 for the Sinclair ZX Interface 1.

As they simply don't make ZX81 ULAs anymore, then unfortunately if the ULA has failed (and there's not much else on a ZX81 to fail), then options for repair are rapidly diminishing. The vLA81 provides a simple way to keep these icons of 80's computing going.

Apart from providing the functionality of both the earlier 2C158E/184 ULA (without back porch) and the 2C210E (with back porch), the vLA81 also has a few extras added.

vLA81 features:

  • Fits within the same 40 pin DIL socket outline as the original ULA.
  • Narrow IC pins for easy plugin ULA replacement. In most cases the existing socket will be OK (unless, of course, the existing ULA is soldered in).
  • Provides the same functionality as the 2C210E Sinclair ULA by default.
  • Video level selectable between standard video (suitable for direct connection to a 75 ohm monitor input) and high sync level (suitable for the modulator input or some video mod boards).
  • Back porch on/off select.
  • Internal 32K memory support (High or Low for the different hires schemes). Note that the M1NOT mod is not needed with the 32K internal memory. Existing M1NOT enabled internal memory will work fine with the default ZX81 memory mapping selected.
  • Programmable user configuration gives access to:
    • Inverse or normal video and choice of black or white border.
    • 50/60 Hz video standard.
    • Ability to map ram to the ROM space (write protect enable/disable – 32K internal ram required).
    • Configuration port socket provided on PCB base for external config switch.
  • Tested with an extensive suite of ZX81 software.
  • Ideal for preserving the original ZX81 ULA.
  • Low power consumption.

 

Note: If you require the external configuration switch assembly then please let me know.

Whether you want to just get a faulty ZX81 back up and running, or want to extend the ZX81 with expanded memory and HIRES, the vLA81 can provide what you need.

Picture gallery

  • vLA81 : A replacement for the Sinclair ZX81 ULA
  • vLA81 : A replacement for the Sinclair ZX81 ULA
  • vLA81 : A replacement for the Sinclair ZX81 ULA
  • vLA81 : A replacement for the Sinclair ZX81 ULA

Questions and Answers

Shipping and Payment

Item Location:
Katikati, New Zealand
Shipping conditions:
Buyer pays shipping expenses
Shipment fee:
  • To New Zealand :
  • First Class Post : £2.00
  • Courier : £4.00
  • To EU :
  • Airmail Post : £7.50
  • To Rest of Europe :
  • Airmail Post : £7.50
  • To Americas :
  • Airmail Post : £7.50
  • To Rest of World :
  • Airmail Post : £7.50
Shipment terms:
Not specified
Payment methods:
Paypal

The seller accepts all responsibility for this listing

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