5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS T2130
MICROCOMPUTER
The purpose of the microcomputer block is to run the programme properly. It consists of the following
units:
- an 8 bit Hitachi microprocessor U02
- an EPROM carrying the programme U01
- chip select circuit for the EPROM P01 and U13/2
- a watch dog & battery low detector U03.
There are several options when configuring the microcomputer. The options are selectable in the jumper
block area, ref. P01.
- P01 selects where the microprocessor has to find the programme.
I - Mode: Internal mode, (U02, pin 5 at +5V)
This means that the programme must be masked and the processor is an
HD6301Y type.
The remaining jumpers P01/2, P01/3, and P01/4 have then no sense.
E - Mode: External mode, (U02, pin 5 at 0V).
The programme must reside in an EPROM (PROM) ref. U01. The processor
type can either be HD6301Y or HD6303Y.
- P01/2 sets the EPROM size
- P01/3 &
- P01/4 select in conjunction the address where the EPROM is to be seen
for the microprocessor.
27C64 starts address E000 Hex:
Figure 1: P01 connections for 27C64
27C128 starts address C000 Hex:
Figure 2: P01 connections for 27C128
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