MEMORY PLUS Manual By Lee Davison
Page 13
The following connections must be made between the MICRO and the MEMORY PLUS
board before any EPROM Programming can take place:
MICRO A-9 to MP A-19 Port B Bit 0 (PB0) Address Bit 8 for EPROM
MICRO A-10 to MP A-20 Port B Bit 1 (PB1) Address Bit 9 for EPROM
MICRO A-11 to MP A-21 Port B Bit 2 (PB2) Address Bit 10 for EPROM
If the MEMORY PLUS board is mounted in its normal position, directly below the
MICRO, it may be difficult or impossible to get access to the EPROM socket for
programming. There are two ways around this problem.
1. Use a 24 pin header to bring wires directly from the EPROM
Programming Socket out to a more accessible location.
2. Attach wires for an additional EPROM Programming Socket directly
to the MP application connector. All of the lines necessary for
attaching an external EPROM Programming Socket are available:
EPROM Socket MP Application Function
Connector
1 A-15 Address bit7 from VIA PB7
2 A-B Address bit6 from VIA PB6
3 A-16 Address bitS from VIA PBS
4 A-13 Address bit4 from VIA PB4
5 A-12 Address bit3 from VIA PB3
6 A-11 Address bit2 from VIA PB2
7 A-10 Address bit1 from VIA PB1
8 A-9 Address bit0 from VIA PBO
9 A-14 Data bit 0 from VIA PA0
10 A-2 Data bit 1 from VIA PA1
11 A-3 Data bit 2 from VIA PA2
12 A-1 Ground
13 A-4 Data bit 3 from VIA PA3
14 A-5 Data bit 4 from VIA PA4
15 A-6 Data bit S from VIA PAS
16 A-7 Data bit 6 from VIA PA6
17 A-8 Data bit 7 from VIA PA7
18 A-18 Program Pulse Inverted from VIA CB2
19 (MICRO A-11) A-21 Address bit 10 from MICRO PB2
20 A-F Chip Select from VIA CA2
21 A-22 +25V direct or from +27 to +30 regulator
22 (MICRO A-10) A-20 Address bit 9 from MICRO PB1
23 (MICRO A-9) A-19 Address bit 8 from MICRO PB0
24 (MICRO A-A) A-A +5V regulated
The addressing for the EPROM Socket only consists of eleven (11) bits. This
means that addressing for programming purposes runs from 0000 to 07FF, regardless
of the actual address that the EPROM will eventually reside at. The high order
five (5) bits of EPROM address are totally defined by which socket the EPROM is
placed in and where the set of EPROMs are switched to: 2000, 4000,..., E000.
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Last page update: 8th December, 2002. |
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