Some more info on the 8049 familie, just for fun:

Philips had some derivatives with extra hardware, like they have now for the 8051 derivatives.
(e.g. a version with build-in on screen display for the control of television sets.)

I have found the 8048 and the 8049 many times in older PC-keyboards.

Basic devices from the 8048 family of Intel were:

8035: 64x8 RAM, ROMless version of 8048
8039: 128x8 RAM, ROMless version of 8049
8040: 256x8 RAM, ROMless version of 8050
8048: 64x8 RAM, 1Kx8 MASKROM
8049: 128x8 RAM, 2Kx8 MASKROM
8050: 256x8 RAM, 4Kx8 MASKROM

All these mentioned devices are in 40 pin DIL cases and had (like many 8051 derivatives) an EA pin to make it possible to acces external program or data memory

There were also HMOS and CMOS versions, e.g. 80C49 for the CMOS version of 8049.

Some common features:

* 8-bit timer/event counter
* Internal oscillatorcircuit
* single level vectored interrupts:external and timer/counter
* 17 internal registers: accumulator and 16 addressable registers
* over 90 instructions: 70% single-byte; all instructions 1 or 2 cycles
* power down mode

Like I said earlier, this info is just for fun (hope Erik Malund will read this too :) ).
And, as the others said in their reactions, I also won't reccomment you to invest time to learn about programming this family, as it is outdated and the ASM is not compatible with the 8051-52 core. Spend your time on the 8052 to have a lot more fun !

Succes in this really interesting world of microcontrollers.

Henk.