One of the forgotten microprocessors / microcontrollers is the Intel MCS-48 family which was Intel’s first microcontroller and was released in 1976 and was manufactured into the 1990ties. At the bottom of this page I have a overview of the many members of this microcontroller family. The 8048 is the most prominent member of the family. The MCS-48 family has a modified Harvard architecture, with internal or external program ROM and 64 to 256 bytes of internal RAM. The I/O is mapped into its own address space, separate from programs and data. Because of its low costs and single chip operation its was used in many cost-sensitive consumer electronics devices such as TV remotes, computer keyboards (TRS-80 Model II, IBM PC), and toys. Years later the MCS-48 chips were replaced by the very successful MCS-51 series that is still manufactured (and used) today.
I also have a Facebook Group on Retro Computing and Electronics, feel free to join!
The MCS-48 processor family
NEC UPD8022C (Processor)
In 1976 Intel and NEC agreed that NEC could make second source chips from Intel and NEC also made and 8022 from Intel. The 8022 is as standard
MCS-48 series chip and has a modified Harvard architecture, with 2K × 8 ROM 64 × 8 RAM + A/D-converter. I cannot find any datasheet on this chip.
wikipedia MCS-48 / 8035 (Processor) (Eng)
Intel 8035 (Processor)
In 1976 Intel introduced the MCS-48 microcontroller series, its first members were 8048, 8035 and 8748. In the beginning these chips were using NMOS
technology, later they became available in CMOS technology. The MCS-48 series has a modified Harvard architecture, with internal or external program
ROM and 64–256 bytes of internal (on-chip) RAM. The I/O is mapped into its own address space, separate from programs and data.The MCS-48 series was
later replaced by the very successful MCS-51 series but the chips are still used in cheap consumer electronics devices such as TV remotes, computer
keyboards. and toys. Compared to the standard 8048 the 8035 has no internal ROM and 64 x 8 bytes internal RAM memory.
wikipedia MCS-48 / 8035 (Processor) (Eng)
UPD80C35 Processor Datasheet
Intel 8039 (Processor)
The 8039 is also a member of the MCS-48 processor family. Compared to the standard 8048 the 8039 equals to a 8035 and has no internal ROM and
128 x 8 bytes internal RAM memory on chip.
wikipedia MCS-48 / 8035 (Processor) (Eng)
P8039AHL Processor Datasheet
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Intel 8039 (Processor)
The 8040 is also a member of the MCS-48 processor family. Compared to the standard 8048 the 8040 equals to a 8035 and has no internal ROM and
256 x 8 bytes internal RAM memory on chip.
wikipedia MCS-48 / 8035 (Processor) (Eng)
P8039AHL Processor Datasheet
8041 (UPI)
The 8041 is also a member of the MCS-48 processor family and it use is a Universal Peripheral Interface 8 bit Slave Microcontroller. It has
1024 x 8 ROM and 64 x 8 RAM on chip. The 8041 is essentially a ‘‘slave’’ microcontroller, or a microcontroller with a slave interface included
on the chip. Interface registers are included to enable the UPI device to function as a slave peripheral controller in the MCS Modules and iAPX
family, as well as other 8-, 16-, and 32-bit systems.
wikipedia 8048 (Eng)
UPD8041 DatasManual
D8741 (UPI)
The 8741 is also a member of the MCS-48 processor family and it use is a Universal Peripheral Interface 8 bit Slave Microcontroller. It has
1024 x 8 EPROM and 64 x 8 RAM on chip. The 8741 is essentially a ‘‘slave’’ microcontroller, or a microcontroller with a slave interface included
on the chip. Interface registers are included to enable the UPI device to function as a slave peripheral controller in the MCS Modules and iAPX
family, as well as other 8-, 16-, and 32-bit systems.
I have four D8741 from NEC and two D8741 from Intel in my collection.
wikipedia 8048 (Eng)
D8741 DatasManual
8042 (UPI)
The 8042 is also a member of the MCS-48 processor family and it use is a Universal Peripheral Interface 8 bit Slave Microcontroller. It has
4096 x 8 ROM and 256 x 8 RAM on chip. The 8042 is essentially a ‘‘slave’’ microcontroller, or a microcontroller with a slave interface included
on the chip. Interface registers are included to enable the UPI device to function as a slave peripheral controller in the MCS Modules and iAPX
family, as well as other 8-, 16-, and 32-bit systems.
wikipedia 8048 (Eng)
MBL8042 DatasManual
8048 (MCU)
The 8048 is also a member of the MCS-48 processor family. The 8048 has 1Kb x 8 bytes ROM and 64 x 8 bytes
internal RAM memory on chip, and 27 I/O lines.
I have two PE8048 from Intel and four MAB8048 from Philips in my collection.
wikipedia 8048 (Eng)
8048 DatasManual
P8748 (MCU)
The 8748 is also a member of the MCS-48 processor family. Compared to the standard 8048 the 8748 has 1Kb x 8 bytes PROM and 64 x 8 bytes
internal RAM memory on chip, and 27 I/O lines.
wikipedia 8048 (Eng)
P8748 DatasManual
8049 (MCU)
The 8049 is also a member of the MCS-48 processor family. Compared to the standard 8048 the 8049 has 2Kb x 8 bytes ROM and 128 x 8 bytes
internal RAM memory on chip.
wikipedia 8048 (Eng)
MBL8042 DatasManual
8050 (8 bit Microsontroller)
The 8050 is also a member of the MCS-48 processor family. Compared to the standard 8048 the 8039 has 4K x 8 ROM and 256 × 8 RAM memory on chip.
M5M8050H Datasheet (pdf)
The MSC-48 internals
The MSC-48 pin layouts
