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F/+MCART1
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_29.ADF |
| Filename: | F/+MCART1 |
| Read OK: | ✔ |
| File size: | 0F93 bytes |
| Load address: | 4D204556 |
| Exec address: | 54524143 |
File contents
�..>......*.......*.......*.......*.......*.......*.......*.......*.......*.<
Support Group Application Note Number: 014
------------------------------------------
Copyright (C) Acorn Computers Limited 1992
Acorn Computers Limited
Acorn House
Vision Park
Histon
Cambridge CB4 4AE
Acorn Electron Cartridge Interface Specification
Applicable Hardware: Acorn Electron
This specification details the characteristics of the Cartridge interface
as fitted to the Acorn Electron and BBC Master 128 compute rs.
The specification details the physical and electrical characteristics and
software environment of the cartridges.
1.0 Terminology
CMOS - Complementary metal-oxide-silicon technology
CPU - The microprocessor in the host computer
TTL - Transistor/Transistor Logic
& - As a number prefix means a hexadecimal number follows
n - As a signal prefix means the signal is active low
2.0 Host Computer Connection
Cartridges plug into a 44 way gold plated edge connector arranged on each
side of a 0.05 inch slot as 22 ways of 0.05" x 0.5" on 0.1 " centres. The
connectors are parallel to the front of the computer with the front and
rear facing sides designated 'B' and 'A' res pectively. Pin 1 of each
side is on the far right.
This is shown in Diagram 1.
Cartridges are aligned and polarised by the case; they are plugged
vertically into the host. All cartridges constructed to the time of
writing have the components mounted on the pcb 'A' side.
2.1 Pinout
The pins are described as seen from the cartridges; ie an input to the
cartridge.
SIDE 'A'
1 +5V - Power supply
This is the system logic supply rail. No more than 150mA should be
drawn by a cartridge in a fully configured Master 128 computer, ie
with internal co-processor fitted. No more than 50mA should be
drawn by a cartridge fitted to the Electron.
2 nOE - Output Enable : Input with CMOS levels
This is an active low signal during the PH12 period of the system
clock. It is intended to switch on the output buffers of memory
devices in cartridges. It is not guaranteed to be high at other
times.
The front cartridge slot is allocated to system ROM positions 0 and
1. The rear slot is allocated to positions 2 and 3.
3 nRST - System Reset : Input with CMOS levels
This signal is active low during system reset. It is not
synchronised to any internal clock.
4 CSRW - Chip Select / Read/Write : Input with CMOS levels
On the Electron: This pin is the CPU read/write line.
On the Master 128: This pin changes function according to the
memory region that the CPU is addressing. During accesses to
devices in the region &FC00 to &FEFF it is equivalent to the CPU
read/write line during nPH12. For all other accesses it is an
active high chip select for memory devices. It is not guaranteed
to be low at other times.
This approach is necessary for compatibility with the Electron.
5 A8 - Address line 8 : Input with TTL levels
6 A13 - Address line 13 : Input with TTL levels
7 A12 - Address line 12 : Input with TTL levels
8 PH12 - CPU clock : Input with CMOS levels
This input is the host computer PH12out.
9 -5V - The negative supply voltage
No more than 20mA per cartridge should be drawn from this supply.
10 CSYNC/MADET
On the Electron: This is a "no connect" on the Electron.
On the Master 128: This pin has two functions dependant on the
position of a link in the host computer:-
E/nB: this is the default function. It allows hardware in
cartridges to "know" which into which type of computer it is
plugged. It is a direct connection to+0V in the Master 128
and a floating node in the Electron.
CSYNC - Composite Synchronisation: Input with TTL levels
The system composite vertical and horizontal
synchronisation is made available. It is intended to be
used in genlock applications.
00000000 81 2e 2e 3e 2e 2e 2e 2e 2e 2e 2a 2e 2e 2e 2e 2e |...>......*.....| 00000010 2e 2e 2a 2e 2e 2e 2e 2e 2e 2e 2a 2e 2e 2e 2e 2e |..*.......*.....| * 00000040 2e 2e 2a 2e 2e 2e 2e 2e 2e 2e 2a 2e 3c 0d 0d 53 |..*.......*.<..S| 00000050 75 70 70 6f 72 74 20 47 72 6f 75 70 20 41 70 70 |upport Group App| 00000060 6c 69 63 61 74 69 6f 6e 20 4e 6f 74 65 20 4e 75 |lication Note Nu| 00000070 6d 62 65 72 3a 20 30 31 34 0d 2d 2d 2d 2d 2d 2d |mber: 014.------| 00000080 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| * 000000a0 2d 2d 2d 2d 0d 43 6f 70 79 72 69 67 68 74 20 28 |----.Copyright (| 000000b0 43 29 20 41 63 6f 72 6e 20 43 6f 6d 70 75 74 65 |C) Acorn Compute| 000000c0 72 73 20 4c 69 6d 69 74 65 64 20 31 39 39 32 0d |rs Limited 1992.| 000000d0 41 63 6f 72 6e 20 43 6f 6d 70 75 74 65 72 73 20 |Acorn Computers | 000000e0 4c 69 6d 69 74 65 64 0d 41 63 6f 72 6e 20 48 6f |Limited.Acorn Ho| 000000f0 75 73 65 0d 56 69 73 69 6f 6e 20 50 61 72 6b 0d |use.Vision Park.| 00000100 48 69 73 74 6f 6e 0d 43 61 6d 62 72 69 64 67 65 |Histon.Cambridge| 00000110 20 20 20 20 20 20 20 43 42 34 20 34 41 45 0d 0d | CB4 4AE..| 00000120 41 63 6f 72 6e 20 45 6c 65 63 74 72 6f 6e 20 43 |Acorn Electron C| 00000130 61 72 74 72 69 64 67 65 20 49 6e 74 65 72 66 61 |artridge Interfa| 00000140 63 65 20 53 70 65 63 69 66 69 63 61 74 69 6f 6e |ce Specification| 00000150 0d 41 70 70 6c 69 63 61 62 6c 65 20 48 61 72 64 |.Applicable Hard| 00000160 77 61 72 65 3a 20 41 63 6f 72 6e 20 45 6c 65 63 |ware: Acorn Elec| 00000170 74 72 6f 6e 0d 0d 54 68 69 73 20 73 70 65 63 69 |tron..This speci| 00000180 66 69 63 61 74 69 6f 6e 20 64 65 74 61 69 6c 73 |fication details| 00000190 20 74 68 65 20 63 68 61 72 61 63 74 65 72 69 73 | the characteris| 000001a0 74 69 63 73 20 6f 66 20 74 68 65 20 43 61 72 74 |tics of the Cart| 000001b0 72 69 64 67 65 20 69 6e 74 65 72 66 61 63 65 0d |ridge interface.| 000001c0 61 73 20 66 69 74 74 65 64 20 74 6f 20 74 68 65 |as fitted to the| 000001d0 20 41 63 6f 72 6e 20 45 6c 65 63 74 72 6f 6e 20 | Acorn Electron | 000001e0 61 6e 64 20 42 42 43 20 4d 61 73 74 65 72 20 31 |and BBC Master 1| 000001f0 32 38 20 63 6f 6d 70 75 74 65 20 72 73 2e 0d 0d |28 compute rs...| 00000200 54 68 65 20 73 70 65 63 69 66 69 63 61 74 69 6f |The specificatio| 00000210 6e 20 64 65 74 61 69 6c 73 20 74 68 65 20 70 68 |n details the ph| 00000220 79 73 69 63 61 6c 20 61 6e 64 20 65 6c 65 63 74 |ysical and elect| 00000230 72 69 63 61 6c 20 63 68 61 72 61 63 74 65 72 69 |rical characteri| 00000240 73 74 69 63 73 20 61 6e 64 0d 73 6f 66 74 77 61 |stics and.softwa| 00000250 72 65 20 65 6e 76 69 72 6f 6e 6d 65 6e 74 20 6f |re environment o| 00000260 66 20 74 68 65 20 63 61 72 74 72 69 64 67 65 73 |f the cartridges| 00000270 2e 0d 0d 31 2e 30 20 20 54 65 72 6d 69 6e 6f 6c |...1.0 Terminol| 00000280 6f 67 79 0d 0d 43 4d 4f 53 20 20 2d 20 20 43 6f |ogy..CMOS - Co| 00000290 6d 70 6c 65 6d 65 6e 74 61 72 79 20 6d 65 74 61 |mplementary meta| 000002a0 6c 2d 6f 78 69 64 65 2d 73 69 6c 69 63 6f 6e 20 |l-oxide-silicon | 000002b0 74 65 63 68 6e 6f 6c 6f 67 79 0d 43 50 55 20 20 |technology.CPU | 000002c0 20 20 2d 20 54 68 65 20 6d 69 63 72 6f 70 72 6f | - The micropro| 000002d0 63 65 73 73 6f 72 20 69 6e 20 74 68 65 20 68 6f |cessor in the ho| 000002e0 73 74 20 63 6f 6d 70 75 74 65 72 0d 54 54 4c 20 |st computer.TTL | 000002f0 20 20 20 2d 20 54 72 61 6e 73 69 73 74 6f 72 2f | - Transistor/| 00000300 54 72 61 6e 73 69 73 74 6f 72 20 4c 6f 67 69 63 |Transistor Logic| 00000310 0d 26 20 20 20 20 20 20 2d 20 41 73 20 61 20 6e |.& - As a n| 00000320 75 6d 62 65 72 20 70 72 65 66 69 78 20 6d 65 61 |umber prefix mea| 00000330 6e 73 20 61 20 68 65 78 61 64 65 63 69 6d 61 6c |ns a hexadecimal| 00000340 20 6e 75 6d 62 65 72 20 66 6f 6c 6c 6f 77 73 0d | number follows.| 00000350 6e 20 20 20 20 20 20 2d 20 41 73 20 61 20 73 69 |n - As a si| 00000360 67 6e 61 6c 20 70 72 65 66 69 78 20 6d 65 61 6e |gnal prefix mean| 00000370 73 20 74 68 65 20 73 69 67 6e 61 6c 20 69 73 20 |s the signal is | 00000380 61 63 74 69 76 65 20 6c 6f 77 0d 0d 32 2e 30 20 |active low..2.0 | 00000390 20 48 6f 73 74 20 43 6f 6d 70 75 74 65 72 20 43 | Host Computer C| 000003a0 6f 6e 6e 65 63 74 69 6f 6e 0d 0d 43 61 72 74 72 |onnection..Cartr| 000003b0 69 64 67 65 73 20 70 6c 75 67 20 69 6e 74 6f 20 |idges plug into | 000003c0 61 20 34 34 20 77 61 79 20 67 6f 6c 64 20 70 6c |a 44 way gold pl| 000003d0 61 74 65 64 20 65 64 67 65 20 63 6f 6e 6e 65 63 |ated edge connec| 000003e0 74 6f 72 20 61 72 72 61 6e 67 65 64 20 6f 6e 20 |tor arranged on | 000003f0 65 61 63 68 0d 73 69 64 65 20 6f 66 20 61 20 30 |each.side of a 0| 00000400 2e 30 35 20 69 6e 63 68 20 73 6c 6f 74 20 61 73 |.05 inch slot as| 00000410 20 32 32 20 77 61 79 73 20 6f 66 20 30 2e 30 35 | 22 ways of 0.05| 00000420 22 20 78 20 30 2e 35 22 20 6f 6e 20 30 2e 31 20 |" x 0.5" on 0.1 | 00000430 22 20 63 65 6e 74 72 65 73 2e 20 20 54 68 65 0d |" centres. The.| 00000440 63 6f 6e 6e 65 63 74 6f 72 73 20 61 72 65 20 70 |connectors are p| 00000450 61 72 61 6c 6c 65 6c 20 74 6f 20 74 68 65 20 66 |arallel to the f| 00000460 72 6f 6e 74 20 6f 66 20 74 68 65 20 63 6f 6d 70 |ront of the comp| 00000470 75 74 65 72 20 77 69 74 68 20 74 68 65 20 66 72 |uter with the fr| 00000480 6f 6e 74 20 61 6e 64 0d 72 65 61 72 20 66 61 63 |ont and.rear fac| 00000490 69 6e 67 20 73 69 64 65 73 20 64 65 73 69 67 6e |ing sides design| 000004a0 61 74 65 64 20 27 42 27 20 61 6e 64 20 27 41 27 |ated 'B' and 'A'| 000004b0 20 72 65 73 20 70 65 63 74 69 76 65 6c 79 2e 20 | res pectively. | 000004c0 20 50 69 6e 20 31 20 6f 66 20 65 61 63 68 0d 73 | Pin 1 of each.s| 000004d0 69 64 65 20 69 73 20 6f 6e 20 74 68 65 20 66 61 |ide is on the fa| 000004e0 72 20 72 69 67 68 74 2e 20 20 0d 0d 54 68 69 73 |r right. ..This| 000004f0 20 69 73 20 73 68 6f 77 6e 20 69 6e 20 44 69 61 | is shown in Dia| 00000500 67 72 61 6d 20 31 2e 0d 0d 43 61 72 74 72 69 64 |gram 1...Cartrid| 00000510 67 65 73 20 61 72 65 20 61 6c 69 67 6e 65 64 20 |ges are aligned | 00000520 61 6e 64 20 70 6f 6c 61 72 69 73 65 64 20 62 79 |and polarised by| 00000530 20 74 68 65 20 63 61 73 65 3b 20 74 68 65 79 20 | the case; they | 00000540 61 72 65 20 70 6c 75 67 67 65 64 0d 76 65 72 74 |are plugged.vert| 00000550 69 63 61 6c 6c 79 20 69 6e 74 6f 20 74 68 65 20 |ically into the | 00000560 68 6f 73 74 2e 20 20 41 6c 6c 20 63 61 72 74 72 |host. All cartr| 00000570 69 64 67 65 73 20 63 6f 6e 73 74 72 75 63 74 65 |idges constructe| 00000580 64 20 74 6f 20 74 68 65 20 74 69 6d 65 20 6f 66 |d to the time of| 00000590 0d 77 72 69 74 69 6e 67 20 68 61 76 65 20 74 68 |.writing have th| 000005a0 65 20 63 6f 6d 70 6f 6e 65 6e 74 73 20 6d 6f 75 |e components mou| 000005b0 6e 74 65 64 20 6f 6e 20 74 68 65 20 70 63 62 20 |nted on the pcb | 000005c0 27 41 27 20 73 69 64 65 2e 0d 0d 32 2e 31 20 20 |'A' side...2.1 | 000005d0 50 69 6e 6f 75 74 0d 0d 54 68 65 20 70 69 6e 73 |Pinout..The pins| 000005e0 20 61 72 65 20 64 65 73 63 72 69 62 65 64 20 61 | are described a| 000005f0 73 20 73 65 65 6e 20 66 72 6f 6d 20 74 68 65 20 |s seen from the | 00000600 63 61 72 74 72 69 64 67 65 73 3b 20 69 65 20 61 |cartridges; ie a| 00000610 6e 20 69 6e 70 75 74 20 74 6f 20 74 68 65 0d 63 |n input to the.c| 00000620 61 72 74 72 69 64 67 65 2e 0d 0d 53 49 44 45 20 |artridge...SIDE | 00000630 27 41 27 0d 0d 31 20 20 2b 35 56 20 2d 20 50 6f |'A'..1 +5V - Po| 00000640 77 65 72 20 73 75 70 70 6c 79 0d 20 20 20 54 68 |wer supply. Th| 00000650 69 73 20 69 73 20 74 68 65 20 73 79 73 74 65 6d |is is the system| 00000660 20 6c 6f 67 69 63 20 73 75 70 70 6c 79 20 72 61 | logic supply ra| 00000670 69 6c 2e 20 20 4e 6f 20 6d 6f 72 65 20 74 68 61 |il. No more tha| 00000680 6e 20 31 35 30 6d 41 20 73 68 6f 75 6c 64 20 62 |n 150mA should b| 00000690 65 20 0d 20 20 20 64 72 61 77 6e 20 62 79 20 61 |e . drawn by a| 000006a0 20 63 61 72 74 72 69 64 67 65 20 69 6e 20 61 20 | cartridge in a | 000006b0 66 75 6c 6c 79 20 63 6f 6e 66 69 67 75 72 65 64 |fully configured| 000006c0 20 4d 61 73 74 65 72 20 31 32 38 20 63 6f 6d 70 | Master 128 comp| 000006d0 75 74 65 72 2c 20 69 65 20 0d 20 20 20 77 69 74 |uter, ie . wit| 000006e0 68 20 69 6e 74 65 72 6e 61 6c 20 63 6f 2d 70 72 |h internal co-pr| 000006f0 6f 63 65 73 73 6f 72 20 66 69 74 74 65 64 2e 20 |ocessor fitted. | 00000700 20 4e 6f 20 6d 6f 72 65 20 74 68 61 6e 20 35 30 | No more than 50| 00000710 6d 41 20 73 68 6f 75 6c 64 20 62 65 20 0d 20 20 |mA should be . | 00000720 20 64 72 61 77 6e 20 62 79 20 61 20 63 61 72 74 | drawn by a cart| 00000730 72 69 64 67 65 20 66 69 74 74 65 64 20 74 6f 20 |ridge fitted to | 00000740 74 68 65 20 45 6c 65 63 74 72 6f 6e 2e 0d 0d 32 |the Electron...2| 00000750 20 20 6e 4f 45 20 2d 20 4f 75 74 70 75 74 20 45 | nOE - Output E| 00000760 6e 61 62 6c 65 20 3a 20 49 6e 70 75 74 20 77 69 |nable : Input wi| 00000770 74 68 20 43 4d 4f 53 20 6c 65 76 65 6c 73 20 0d |th CMOS levels .| 00000780 20 20 20 54 68 69 73 20 69 73 20 61 6e 20 61 63 | This is an ac| 00000790 74 69 76 65 20 6c 6f 77 20 73 69 67 6e 61 6c 20 |tive low signal | 000007a0 64 75 72 69 6e 67 20 74 68 65 20 50 48 31 32 20 |during the PH12 | 000007b0 70 65 72 69 6f 64 20 6f 66 20 74 68 65 20 73 79 |period of the sy| 000007c0 73 74 65 6d 0d 20 20 20 63 6c 6f 63 6b 2e 20 20 |stem. clock. | 000007d0 49 74 20 69 73 20 69 6e 74 65 6e 64 65 64 20 74 |It is intended t| 000007e0 6f 20 73 77 69 74 63 68 20 6f 6e 20 74 68 65 20 |o switch on the | 000007f0 6f 75 74 70 75 74 20 62 75 66 66 65 72 73 20 6f |output buffers o| 00000800 66 20 6d 65 6d 6f 72 79 20 0d 20 20 20 64 65 76 |f memory . dev| 00000810 69 63 65 73 20 69 6e 20 63 61 72 74 72 69 64 67 |ices in cartridg| 00000820 65 73 2e 20 20 49 74 20 69 73 20 6e 6f 74 20 67 |es. It is not g| 00000830 75 61 72 61 6e 74 65 65 64 20 74 6f 20 62 65 20 |uaranteed to be | 00000840 68 69 67 68 20 61 74 20 6f 74 68 65 72 20 0d 20 |high at other . | 00000850 20 20 74 69 6d 65 73 2e 0d 20 20 20 54 68 65 20 | times.. The | 00000860 66 72 6f 6e 74 20 63 61 72 74 72 69 64 67 65 20 |front cartridge | 00000870 73 6c 6f 74 20 69 73 20 61 6c 6c 6f 63 61 74 65 |slot is allocate| 00000880 64 20 74 6f 20 73 79 73 74 65 6d 20 52 4f 4d 20 |d to system ROM | 00000890 70 6f 73 69 74 69 6f 6e 73 20 30 20 61 6e 64 20 |positions 0 and | 000008a0 0d 20 20 20 31 2e 20 54 68 65 20 72 65 61 72 20 |. 1. The rear | 000008b0 73 6c 6f 74 20 69 73 20 61 6c 6c 6f 63 61 74 65 |slot is allocate| 000008c0 64 20 74 6f 20 70 6f 73 69 74 69 6f 6e 73 20 32 |d to positions 2| 000008d0 20 61 6e 64 20 33 2e 0d 0d 33 20 20 6e 52 53 54 | and 3...3 nRST| 000008e0 20 2d 20 53 79 73 74 65 6d 20 52 65 73 65 74 20 | - System Reset | 000008f0 3a 20 49 6e 70 75 74 20 77 69 74 68 20 43 4d 4f |: Input with CMO| 00000900 53 20 6c 65 76 65 6c 73 0d 20 20 20 54 68 69 73 |S levels. This| 00000910 20 73 69 67 6e 61 6c 20 69 73 20 61 63 74 69 76 | signal is activ| 00000920 65 20 6c 6f 77 20 64 75 72 69 6e 67 20 73 79 73 |e low during sys| 00000930 74 65 6d 20 72 65 73 65 74 2e 20 20 49 74 20 69 |tem reset. It i| 00000940 73 20 6e 6f 74 20 0d 20 20 20 73 79 6e 63 68 72 |s not . synchr| 00000950 6f 6e 69 73 65 64 20 74 6f 20 61 6e 79 20 69 6e |onised to any in| 00000960 74 65 72 6e 61 6c 20 63 6c 6f 63 6b 2e 0d 0d 34 |ternal clock...4| 00000970 20 20 43 53 52 57 20 2d 20 43 68 69 70 20 53 65 | CSRW - Chip Se| 00000980 6c 65 63 74 20 2f 20 52 65 61 64 2f 57 72 69 74 |lect / Read/Writ| 00000990 65 20 3a 20 49 6e 70 75 74 20 77 69 74 68 20 43 |e : Input with C| 000009a0 4d 4f 53 20 6c 65 76 65 6c 73 0d 20 20 20 4f 6e |MOS levels. On| 000009b0 20 74 68 65 20 45 6c 65 63 74 72 6f 6e 3a 20 54 | the Electron: T| 000009c0 68 69 73 20 70 69 6e 20 69 73 20 74 68 65 20 43 |his pin is the C| 000009d0 50 55 20 72 65 61 64 2f 77 72 69 74 65 20 6c 69 |PU read/write li| 000009e0 6e 65 2e 0d 20 20 20 4f 6e 20 74 68 65 20 4d 61 |ne.. On the Ma| 000009f0 73 74 65 72 20 31 32 38 3a 20 54 68 69 73 20 70 |ster 128: This p| 00000a00 69 6e 20 63 68 61 6e 67 65 73 20 66 75 6e 63 74 |in changes funct| 00000a10 69 6f 6e 20 61 63 63 6f 72 64 69 6e 67 20 74 6f |ion according to| 00000a20 20 74 68 65 20 0d 20 20 20 6d 65 6d 6f 72 79 20 | the . memory | 00000a30 72 65 67 69 6f 6e 20 74 68 61 74 20 74 68 65 20 |region that the | 00000a40 43 50 55 20 69 73 20 61 64 64 72 65 73 73 69 6e |CPU is addressin| 00000a50 67 2e 20 20 44 75 72 69 6e 67 20 61 63 63 65 73 |g. During acces| 00000a60 73 65 73 20 74 6f 20 0d 20 20 20 64 65 76 69 63 |ses to . devic| 00000a70 65 73 20 69 6e 20 74 68 65 20 72 65 67 69 6f 6e |es in the region| 00000a80 20 26 46 43 30 30 20 74 6f 20 26 46 45 46 46 20 | &FC00 to &FEFF | 00000a90 69 74 20 69 73 20 65 71 75 69 76 61 6c 65 6e 74 |it is equivalent| 00000aa0 20 74 6f 20 74 68 65 20 43 50 55 20 0d 20 20 20 | to the CPU . | 00000ab0 72 65 61 64 2f 77 72 69 74 65 20 6c 69 6e 65 20 |read/write line | 00000ac0 64 75 72 69 6e 67 20 6e 50 48 31 32 2e 20 20 46 |during nPH12. F| 00000ad0 6f 72 20 61 6c 6c 20 6f 74 68 65 72 20 61 63 63 |or all other acc| 00000ae0 65 73 73 65 73 20 69 74 20 69 73 20 61 6e 20 0d |esses it is an .| 00000af0 20 20 20 61 63 74 69 76 65 20 68 69 67 68 20 63 | active high c| 00000b00 68 69 70 20 73 65 6c 65 63 74 20 66 6f 72 20 6d |hip select for m| 00000b10 65 6d 6f 72 79 20 64 65 76 69 63 65 73 2e 20 20 |emory devices. | 00000b20 49 74 20 69 73 20 6e 6f 74 20 67 75 61 72 61 6e |It is not guaran| 00000b30 74 65 65 64 20 0d 20 20 20 74 6f 20 62 65 20 6c |teed . to be l| 00000b40 6f 77 20 61 74 20 6f 74 68 65 72 20 74 69 6d 65 |ow at other time| 00000b50 73 2e 0d 0d 20 20 20 54 68 69 73 20 61 70 70 72 |s... This appr| 00000b60 6f 61 63 68 20 69 73 20 6e 65 63 65 73 73 61 72 |oach is necessar| 00000b70 79 20 66 6f 72 20 63 6f 6d 70 61 74 69 62 69 6c |y for compatibil| 00000b80 69 74 79 20 77 69 74 68 20 74 68 65 20 45 6c 65 |ity with the Ele| 00000b90 63 74 72 6f 6e 2e 0d 0d 35 20 20 41 38 20 2d 20 |ctron...5 A8 - | 00000ba0 41 64 64 72 65 73 73 20 6c 69 6e 65 20 38 20 3a |Address line 8 :| 00000bb0 20 49 6e 70 75 74 20 77 69 74 68 20 54 54 4c 20 | Input with TTL | 00000bc0 6c 65 76 65 6c 73 0d 0d 36 20 20 41 31 33 20 2d |levels..6 A13 -| 00000bd0 20 41 64 64 72 65 73 73 20 6c 69 6e 65 20 31 33 | Address line 13| 00000be0 20 3a 20 49 6e 70 75 74 20 77 69 74 68 20 54 54 | : Input with TT| 00000bf0 4c 20 6c 65 76 65 6c 73 0d 0d 37 20 20 41 31 32 |L levels..7 A12| 00000c00 20 2d 20 41 64 64 72 65 73 73 20 6c 69 6e 65 20 | - Address line | 00000c10 31 32 20 3a 20 49 6e 70 75 74 20 77 69 74 68 20 |12 : Input with | 00000c20 54 54 4c 20 6c 65 76 65 6c 73 0d 0d 38 20 20 50 |TTL levels..8 P| 00000c30 48 31 32 20 2d 20 43 50 55 20 63 6c 6f 63 6b 20 |H12 - CPU clock | 00000c40 3a 20 49 6e 70 75 74 20 77 69 74 68 20 43 4d 4f |: Input with CMO| 00000c50 53 20 6c 65 76 65 6c 73 0d 20 20 20 54 68 69 73 |S levels. This| 00000c60 20 69 6e 70 75 74 20 69 73 20 74 68 65 20 68 6f | input is the ho| 00000c70 73 74 20 63 6f 6d 70 75 74 65 72 20 50 48 31 32 |st computer PH12| 00000c80 6f 75 74 2e 0d 0d 39 20 20 2d 35 56 20 2d 20 54 |out...9 -5V - T| 00000c90 68 65 20 6e 65 67 61 74 69 76 65 20 73 75 70 70 |he negative supp| 00000ca0 6c 79 20 76 6f 6c 74 61 67 65 0d 20 20 20 20 4e |ly voltage. N| 00000cb0 6f 20 6d 6f 72 65 20 74 68 61 6e 20 32 30 6d 41 |o more than 20mA| 00000cc0 20 70 65 72 20 63 61 72 74 72 69 64 67 65 20 73 | per cartridge s| 00000cd0 68 6f 75 6c 64 20 62 65 20 64 72 61 77 6e 20 66 |hould be drawn f| 00000ce0 72 6f 6d 20 74 68 69 73 20 73 75 70 70 6c 79 2e |rom this supply.| 00000cf0 0d 0d 31 30 20 43 53 59 4e 43 2f 4d 41 44 45 54 |..10 CSYNC/MADET| 00000d00 0d 20 20 20 4f 6e 20 74 68 65 20 45 6c 65 63 74 |. On the Elect| 00000d10 72 6f 6e 3a 20 54 68 69 73 20 69 73 20 61 20 22 |ron: This is a "| 00000d20 6e 6f 20 63 6f 6e 6e 65 63 74 22 20 6f 6e 20 74 |no connect" on t| 00000d30 68 65 20 45 6c 65 63 74 72 6f 6e 2e 0d 20 20 20 |he Electron.. | 00000d40 4f 6e 20 74 68 65 20 4d 61 73 74 65 72 20 31 32 |On the Master 12| 00000d50 38 3a 20 20 54 68 69 73 20 70 69 6e 20 68 61 73 |8: This pin has| 00000d60 20 74 77 6f 20 66 75 6e 63 74 69 6f 6e 73 20 64 | two functions d| 00000d70 65 70 65 6e 64 61 6e 74 20 6f 6e 20 74 68 65 20 |ependant on the | 00000d80 0d 20 20 20 70 6f 73 69 74 69 6f 6e 20 6f 66 20 |. position of | 00000d90 61 20 6c 69 6e 6b 20 69 6e 20 74 68 65 20 68 6f |a link in the ho| 00000da0 73 74 20 63 6f 6d 70 75 74 65 72 3a 2d 0d 20 20 |st computer:-. | 00000db0 20 45 2f 6e 42 3a 20 20 74 68 69 73 20 69 73 20 | E/nB: this is | 00000dc0 74 68 65 20 64 65 66 61 75 6c 74 20 66 75 6e 63 |the default func| 00000dd0 74 69 6f 6e 2e 20 20 49 74 20 61 6c 6c 6f 77 73 |tion. It allows| 00000de0 20 68 61 72 64 77 61 72 65 20 69 6e 20 0d 20 20 | hardware in . | 00000df0 20 20 20 20 20 20 20 20 63 61 72 74 72 69 64 67 | cartridg| 00000e00 65 73 20 74 6f 20 22 6b 6e 6f 77 22 20 77 68 69 |es to "know" whi| 00000e10 63 68 20 69 6e 74 6f 20 77 68 69 63 68 20 74 79 |ch into which ty| 00000e20 70 65 20 6f 66 20 63 6f 6d 70 75 74 65 72 20 69 |pe of computer i| 00000e30 74 20 69 73 20 0d 20 20 20 20 20 20 20 20 20 20 |t is . | 00000e40 70 6c 75 67 67 65 64 2e 20 20 49 74 20 69 73 20 |plugged. It is | 00000e50 61 20 64 69 72 65 63 74 20 63 6f 6e 6e 65 63 74 |a direct connect| 00000e60 69 6f 6e 20 74 6f 2b 30 56 20 69 6e 20 74 68 65 |ion to+0V in the| 00000e70 20 4d 61 73 74 65 72 20 31 32 38 20 0d 20 20 20 | Master 128 . | 00000e80 20 20 20 20 20 20 20 61 6e 64 20 61 20 66 6c 6f | and a flo| 00000e90 61 74 69 6e 67 20 6e 6f 64 65 20 69 6e 20 74 68 |ating node in th| 00000ea0 65 20 45 6c 65 63 74 72 6f 6e 2e 0d 20 20 20 43 |e Electron.. C| 00000eb0 53 59 4e 43 20 2d 20 43 6f 6d 70 6f 73 69 74 65 |SYNC - Composite| 00000ec0 20 53 79 6e 63 68 72 6f 6e 69 73 61 74 69 6f 6e | Synchronisation| 00000ed0 3a 20 20 49 6e 70 75 74 20 77 69 74 68 20 54 54 |: Input with TT| 00000ee0 4c 20 6c 65 76 65 6c 73 0d 20 20 20 20 20 20 20 |L levels. | 00000ef0 20 20 20 20 54 68 65 20 73 79 73 74 65 6d 20 63 | The system c| 00000f00 6f 6d 70 6f 73 69 74 65 20 76 65 72 74 69 63 61 |omposite vertica| 00000f10 6c 20 61 6e 64 20 68 6f 72 69 7a 6f 6e 74 61 6c |l and horizontal| 00000f20 20 0d 20 20 20 20 20 20 20 20 20 20 20 73 79 6e | . syn| 00000f30 63 68 72 6f 6e 69 73 61 74 69 6f 6e 20 69 73 20 |chronisation is | 00000f40 6d 61 64 65 20 61 76 61 69 6c 61 62 6c 65 2e 20 |made available. | 00000f50 20 49 74 20 69 73 20 69 6e 74 65 6e 64 65 64 20 | It is intended | 00000f60 74 6f 20 62 65 20 0d 20 20 20 20 20 20 20 20 20 |to be . | 00000f70 20 20 75 73 65 64 20 69 6e 20 67 65 6e 6c 6f 63 | used in genloc| 00000f80 6b 20 61 70 70 6c 69 63 61 74 69 6f 6e 73 2e 20 |k applications. | 00000f90 20 0d 0d | ..| 00000f93
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