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:
13 days, 01h:11m:24s
Quantity Available
9
Latest buyer:
v***m (0)
Fixed price:
£26.00 Buy now!
VAT, Duty and handling fees may be payable on Price & Shipping on receipt
Shipping Costs:
From only £3.00
Payment methods:
Paypal
Number Sold:
115 (View history)
Buyer Value Date and hour Quantity bought
v***m (0) £26.00 24/06/2022  18:42:06 1
x***u (0) £52.00 02/06/2022  21:51:12 2
s***r (10) £31.20 18/05/2022  16:37:38 1
O***n (3) £52.00 14/05/2022  01:32:59 2
a***8 (0) £31.20 01/05/2022  19:35:09 1
l***e (8) £31.20 26/04/2022  20:24:32 1
j***k (8) £26.00 17/04/2022  16:39:04 1
r***s (1) £156.00 15/04/2022  14:33:42 5
R***a (1) £26.00 12/04/2022  18:10:55 1
P***w (1) £26.00 12/04/2022  12:05:11 1
B***g (9) £25.00 03/03/2022  14:24:32 1
S***i (3) £24.50 04/02/2022  11:14:51 1
B***g (9) £24.50 03/02/2022  15:57:48 1
c***a (2) £24.50 02/02/2022  03:31:32 1
l***i (11) £24.50 27/01/2022  10:51:51 1
O***y (0) £29.40 25/01/2022  23:05:46 1
m***m (0) £24.50 16/01/2022  09:41:03 1
a***t (6) £24.50 09/01/2022  11:20:39 1
B***o (0) £24.50 23/11/2021  08:18:28 1
d***1 (1) £24.50 22/11/2021  15:30:53 1
L***o (0) £24.50 08/11/2021  06:04:09 1
S***s (23) £41.00 14/12/2020  23:06:35 2
1***6 (6) £20.50 11/12/2020  11:31:30 1
h***0 (0) £20.50 08/12/2020  14:35:44 1
d***t (2) £20.50 07/12/2020  07:42:26 1
T***e (0) £20.50 27/11/2020  08:21:45 1
p***s (9) £20.50 19/11/2020  20:51:01 1
t***y (1) £20.50 14/11/2020  07:55:18 1
M***y (3) £41.00 14/11/2020  07:39:28 2
j***4 (2) £20.50 27/09/2020  19:50:08 1
M***y (3) £20.50 27/09/2020  13:22:22 1
p***y (8) £20.50 18/09/2020  13:01:02 1
R***o (4) £20.50 12/09/2020  14:33:45 1
M***n (2) £20.50 10/09/2020  17:01:07 1
d***e (16) £20.50 05/09/2020  21:13:53 1
g***0 (2) £20.50 05/09/2020  14:21:37 1
j***4 (2) £20.50 05/09/2020  09:28:09 1
s***i (1) £41.00 05/09/2020  07:44:29 2
p***r (67) £20.50 05/09/2020  06:35:56 1
j***y (3) £18.95 21/02/2020  14:19:12 1
b***s (5) £18.95 10/02/2020  16:22:19 1
t***t (11) £18.95 03/02/2020  20:57:37 1
A***g (1) £18.95 31/01/2020  19:42:38 1
f***a (4) £18.95 30/01/2020  10:25:49 1
A***o (2) £18.95 27/01/2020  10:47:16 1
b***i (12) £18.95 11/01/2020  21:02:13 1
f***1 (7) £18.95 17/12/2019  10:32:44 1
B***7 (2) £18.95 30/11/2019  18:32:59 1
D***2 (2) £18.95 29/11/2019  09:24:11 1
A***o (12) £18.95 29/11/2019  00:39:02 1
c***9 (3) £18.95 22/11/2019  20:22:30 1
K***i (2) £18.95 19/11/2019  13:54:42 1
s***3 (6) £18.95 16/11/2019  17:13:17 1
1***6 (6) £18.95 14/11/2019  12:38:36 1
c***3 (1) £18.95 12/11/2019  22:08:39 1
S***h (3) £18.95 10/11/2019  00:35:55 1
r***d (2) £18.95 28/10/2019  13:30:26 1
a***a (11) £18.95 25/10/2019  23:01:53 1
a***o (11) £18.95 21/10/2019  08:31:45 1
g***f (13) £18.95 19/10/2019  09:18:40 1
T***6 (21) £18.95 15/10/2019  06:05:45 1
Z***d (4) £18.95 13/10/2019  09:22:30 1
S***9 (10) £18.95 06/10/2019  16:32:15 1
e***e (1) £18.95 30/09/2019  21:39:31 1
d***e (16) £18.95 30/09/2019  15:54:04 1
Z***e (2) £18.95 26/09/2019  09:24:33 1
T***n (2) £18.95 25/09/2019  14:54:49 1
b***a (45) £18.95 24/09/2019  21:14:52 1
j***1 (2) £18.95 23/09/2019  18:44:03 1
b***d (12) £18.95 22/09/2019  19:17:25 1
d***s (22) £18.95 21/09/2019  13:58:18 1
a***a (11) £18.95 21/09/2019  09:00:43 1
a***o (11) £18.95 20/09/2019  19:37:01 1
C***R (1) £18.95 20/09/2019  08:02:22 1
w***d (6) £18.95 19/09/2019  12:58:53 1
p***4 (22) £18.95 18/09/2019  13:25:57 1
z***o (9) £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 (13) £18.95 01/09/2019  12:48:27 1
d***h (24) £18.95 20/08/2019  00:20:50 1
1***K (129) £18.95 14/08/2019  22:56:03 1
L***n (63) £18.95 14/08/2019  20:05:17 1
P***s (84) £18.95 14/08/2019  16:39:53 1
n***l (9) £18.95 14/08/2019  15:52:01 1
p***o (5) £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 (18) £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 (13) £18.95 09/08/2019  11:04:44 1
j***r (2) £37.90 07/08/2019  22:31:10 2
b***i (12) £18.95 06/08/2019  21:19:38 1
a***s (6) £18.95 05/08/2019  15:32:50 1
K***k (69) £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 (7) £18.95 04/08/2019  12:17:13 1
J***3 (26) £37.90 03/08/2019  12:41:40 2
j***5 (2) £18.95 03/08/2019  12:32:24 1
Feedback on this Item
PositivePositive s***r (10) Great value, features and build quality. Thanks :-) 09/06/2022  12:33:00
PositivePositive S***i (3) All is OK, fast shipping, nice soldering. :] 28/02/2022  16:25:06
PositivePositive d***1 (1) Perfect ! Thank You :) 27/01/2022  08:56:09
PositivePositive 1***6 (6) just perfect, thank you 05/01/2021  15:43:23
PositivePositive M***y (3) Produkt ist Super, Lieferzeit Okay. Danke 16/01/2021  07:41:43
PositivePositive M***n (2) Fast shipping, excellent quality, thank you for this great development.
Seller's Response
Thanks for your kind comments and support.
06/10/2020  10:29:28
PositivePositive j***4 (2) Work very well. My Zx81 Run again. Thanks
Seller's Response
Great to hear! Thanks for your support.
27/09/2020  19:53:17
PositivePositive p***r (67) Great service, great product. Many Thanks
Seller's Response
Thanks for your support!
29/09/2020  14:43:52
PositivePositive f***a (4) Works very well. Very good product for replacing a defective ULA. Picture is sharp on a modern TV. 09/04/2020  18:59:06
PositivePositive A***o (2) The item arrived ok. Great seller 02/03/2020  20:43:47
PositivePositive f***1 (7) Perfect ! 08/02/2020  19:23:40
PositivePositive 1***6 (6) just perfect, thank you 05/01/2021  15:43:13
PositivePositive r***d (2) I received the parcel in only one week! I needed time to prove it but it works perfectly. In my opinion an incredible product and a very good seller. 14/11/2019  15:17:29
PositivePositive a***a (11) Work fine, thank you! 18/01/2020  10:25:03
PositivePositive Z***d (4) Thx a lot for this item, arrived in Belgium without problems in perfect state !! 28/10/2019  16:33:53
PositivePositive Z***e (2) Correct trusted partner. I recommend to everyone. 18/10/2019  09:06:48
PositivePositive b***a (45) All ok! 13/10/2019  19:04:38
PositivePositive b***d (12) 12/10/2019  22:56:05
PositivePositive a***a (11) Great hw, perfect transaction 20/10/2019  16:20:29
PositivePositive p***4 (22) Great communication, excellent product. 17/12/2019  12:31:35
PositivePositive 1***K (129) Excellent 22/12/2019  11:11:50
PositivePositive L***n (63) Excellent ULA. Works a treat. 17/10/2019  13:40:30
PositivePositive P***s (84) Very good replacement with very helpful extensions. The shipping time was shorter than expected. A pleasure to buy. 12/11/2019  05:57:40
PositivePositive p***o (5) very ok , good working
Seller's Response
Thanks for the feedback!
14/09/2019  19:35:30
PositivePositive H***S (18) Fast delivery, works great, nice product!
Seller's Response
Thanks for your support!
29/09/2020  21:22:12
PositivePositive K***k (69) Great seller! Item as described and fast shipment.
Seller's Response
Thanks for your support!
31/10/2020  16:49:33
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 (26) Perfect, works fine!
Seller's Response
Thanks for the feedback!
01/09/2019  18:15:58

Item Number : 38492

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Bloodnok (206) User Offline

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Fixed price: £26.00
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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).
    • Option - Configuration port socket on PCB base with 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.

Note: The socket for the External Configuration Switch is not included unless the External Configuration Switch option is purchased.

Picture gallery

  • 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
Shipping Costs:
  • To New Zealand :
  • First Class Post : £3.00
  • Courier : £5.00
  • To EU :
  • Airmail Post : £11.50 For initial item, £1.00 Per additional item
  • To Europe (Non EU) :
  • Airmail Post : £11.50 For initial item, £1.00 Per additional item
  • To Americas (Non USA) :
  • Airmail Post : £11.50 For initial item, £1.00 Per additional item
  • To Rest of World :
  • Airmail Post : £11.50 For initial item, £1.00 Per additional item
  • To USA :
  • Airmail Post : £11.50 For initial item, £1.00 Per additional item
Shipment terms:
Note: All orders are now shipped with a tracked service where available. Please inquire if confirmation is required.

A maximum of 5 x vLA81 can be shipped for the listed shipping price. If more are required please contact me.

New Zealand customers please note that GST of 15% is not included. A separate invoice will be provided upon purchase.
Payment methods:
Paypal

The seller accepts all responsibility for this listing

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