RCA Spectra 70 Training Manual

Examples:
1. Convert (1024)16 to Decimal
1 x 16
3
+ 0 x 16
2
+ 2 x 16
1
+ 4 x 16
0
4096 +
o + 32 + 4 = (4132)10
2. Convert (3AFj16 to Decimal
3 x 16
2
+ 10 x 16
1
+ 15 x 16
0
3 x 256
+ 10 x 16 + 15 x 1
768
+ 160 + 15 = (943)10
The first example shows the hexadecimal address
(I024h6 which has a decimal value of (4132)10. The
actual machine (binary) address is:
0001000000100100
Each hexadecimal character can be represented by
four bits. Therefore, hexadecimal is converted to
binary by replacing each hexadecimal character with
its binary value.
(0001000000100100)2 = 4096 + 32 + 4 (4132)10
The second example shows that the hexadecimal ad-
dress 3AF has a decimal value of 943.
Exercise:
1. A byte consists of __ information bits and
a ___ bit, and is the ___ addressable unit in
the 70/25 HSM.
5
2. An effective HSM address is the absolute sum
of a and a ___ _
3. Base address values are stored in . The
___ and! or fields of an instruction
specify which base address will be used to com-
pute an effective address.
4. The decimal value of a displacement may not
exceed ___ _
5. Convert following hexadecimal numbers to
binary:
a. A4E8(16)
b. E82C(16)
c. 3D71(16)
6. Convert following hexadecimal numbers to
decimal:
a. B5F9(16)
b. F93D(16)
7. Convert following binary numbers to hexa-
decimal:
a. 1100011000001010(2)
b. 0000101001001110(2)
c. 0010110001100000(2)
8. Convert following decimal numbers to hexa-
decimal:
a. 55067(10)
b. 7007(10)

RCA Spectra 70 Specifications

General

Brand	RCA
Model	Spectra 70
Category	Computer Hardware
Language	English