Difference between revisions of "Model A"

From BeebWiki
Jump to: navigation, search
Line 11: Line 11:
 
components and interfaces.
 
components and interfaces.
  
Internal
+
'''Internal'''
 
* 16Kb of RAM instead of 32Kb (The empty spaces were fitted with sockets to simplify upgrades)
 
* 16Kb of RAM instead of 32Kb (The empty spaces were fitted with sockets to simplify upgrades)
 
* 6522 VIA Chip
 
* 6522 VIA Chip
  
Rear interface sockets
+
'''Rear interface sockets'''
 
* RGB port
 
* RGB port
 
* Serial port
 
* Serial port
 
* Analogue port
 
* Analogue port
  
Underside interface sockets
+
'''Underside interface sockets'''
 
* Tube
 
* Tube
 
* User port
 
* User port
Line 26: Line 26:
 
* 1MHz Bus
 
* 1MHz Bus
  
 
+
All of these components could be installed to bring the machine up to full Model B specifications, and many were.
 
 
 
 
 
 
 
 
 
 
16K RAM instead of 32K (although the empty sockets were present on the
 
motherboard). The Model A lacked a 6522 VIA chip (again with an empty socket
 
on the board). None of the expansion ports on the underside of the machine
 
were fitted.
 

Revision as of 12:21, 12 September 2020

BBCMicro.png

The BBC Model A was created as a lower-cost variant to encourage higher sales outside of the schools sector. It was launched at a price of GBP £235 (compared with GBP £335 for the Model B). This price rose to GBP £299 as Acorn found they couldn't make it at the lower price.

While physically identical, the Model A lacked a number of internal components and interfaces.

Internal

  • 16Kb of RAM instead of 32Kb (The empty spaces were fitted with sockets to simplify upgrades)
  • 6522 VIA Chip

Rear interface sockets

  • RGB port
  • Serial port
  • Analogue port

Underside interface sockets

  • Tube
  • User port
  • Centronics (printer) port
  • 1MHz Bus

All of these components could be installed to bring the machine up to full Model B specifications, and many were.