Make this my favourite PET ROM RAM Replacement Board (normal)

Retro Computers >> Commodore >> Pet >> Hardware
Listing type:
Fixed Price Multiple Items
Item Condition:
Seller location:
Tynemouth, United Kingdom
Ending in:
8 days, 22h:17m:25s
Quantity Available
Latest buyer:
p***e (1)
Fixed price:
£70.00 Buy now!
Shipping Costs:
From only £5.00
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Number Sold:
6 (View history)
Buyer Value Date and hour Quantity bought
p***e (1) £70.00 21/03/2024  05:20:11 1
C***T (1) £70.00 15/03/2024  16:19:55 1
M***M (3) £70.00 30/04/2023  20:40:22 1
r***s (1) £70.00 27/09/2022  16:33:21 1
d***k (2) £70.00 03/07/2022  13:17:44 1
c***a (1) £70.00 21/05/2022  15:04:34 1

Item Number : 62175

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Fixed price: £70.00
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This is a board which plugs into the 6502 CPU socket on a Commodore PET computer to replace the main system ROM or RAM.

It is compatible with the following machines

  • 9" PET - 2001, 2001N, 3008, 3016, 3032, 4008, 4016, 4032
  • 12" PET/CBM - 4016, 4032, 8032, 8032-SK

It can be used on CBM 8096 and 8096-SK, but the 64K board cannot be used, so it will revert to an 8032. It cannot be used on the CBM 8296 or any CBM-II series machines.

The video RAM and character ROM are not replaced as they are wired directly to the video circuitry.

The DIP switches can be used to turn on or off ROM and RAM replacement, and also to select the ROM set. There are 8 ROM sets, 4 of which are for the 9" PETs without CRTC chips

  • A simple RAM / character set tester
  • BASIC 1.0 
  • BASIC 2.0
  • BASIC 4.0

The other 4 ROM sets are for 12" PET / CBM models with 6545 CRTC

  • 40 column, normal keyboard, 50Hz
  • 40 column, normal keyboard, 60Hz
  • 80 column, business keyboard, 50Hz
  • 80 column, business keyboard, 60Hz

The BASIC 2.0 and 4.0 and CRTC ROM sets all include a DOS wedge to make accessing an IEEE-488 disk drive easier. BASIC 1.0 does not support IEEE-488 disk drives.

Only a 6502 CPU should be plugged into the socket on the ROM RAM board. 64K RAM boards, 6509 boards from the Super PET or other extensions are not supported.

This version is ideal as a fit and forget upgrade to the maximum RAM and latest ROMs. See my other listings for a larger version with more options for diagnosing ROM or RAM faults. 

More info on my blog:

Picture gallery

  • PET ROM RAM Replacement Board (normal)
  • PET ROM RAM Replacement Board (normal)
  • PET ROM RAM Replacement Board (normal)
  • PET ROM RAM Replacement Board (normal)
  • PET ROM RAM Replacement Board (normal)
  • PET ROM RAM Replacement Board (normal)
  • PET ROM RAM Replacement Board (normal)

Questions and Answers

Shipping and Payment

Item Location:
Tynemouth, United Kingdom
Shipping conditions:
Buyer pays shipping expenses
Shipping Costs:
  • To United Kingdom :
  • First Class Post : £5.00 For initial item, £0.50 Per additional item
  • Special Delivery : £8.00 For initial item, £1.00 Per additional item
  • First Class Signed For : £6.00 For initial item, £0.50 Per additional item
  • To USA :
  • Intl Signed For : £17.50 For initial item, £5.00 Per additional item
Shipment terms:
Sent as small parcel. Signed for or special delivery recommended.
International orders may be subject to delays and additional customs fees. Please be aware of this before purchasing.
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