Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_29.ADF » F/+MCART2
F/+MCART2
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/+MCART2 |
| Read OK: | ✔ |
| File size: | 1035 bytes |
| Load address: | 4D204556 |
| Exec address: | 54524143 |
File contents
�..
11 RNW/READY
This has different functions on the Electron and the Master 128.
On the Electron: READY - CPU wait state control : Open collector
output.When driven low, this line will cause the
CPU to extend its cycle until READY is released.
This will only work on Electrons with CMOS CPUs.
With NMOS CPUs it will only work on read cycles.
On the Master 128:
R/W - Data Direction Control : Input with TTL levels
This is the system data buffer direction control. If low,
cartridges are being written to.If high and selected they may
drive the bus during PH12.
12 nNMI - Non maskable interrupt : Open collector output
This signal is connected to the system NMI line. It is active low.
13 nIRQ - Interrupt request : Open collector output
This signal is connected to the system IRQ line. It is active low.
14 nINFC - Internal Page &FC : Memory active decode input : TTL active
low When bit IFJ is set in the Master 128 ACCCON register, all
accesses to the address range &FC00 to &FCFF will cause this select
to become active. The ACCCON access is not applicable to the
Electron.
15 nINFD - Internal page &FD : Memory active decode input : TTL active
low.When bit IFJ is set in the Master 128 ACCCON register, all
accesses to the address range &FD00 to &FDFF will cause this select
to become active. The ACCCON access is not applicable to the
Electron.
16 ROMQA - Memory paging select : Input with TTL levels
This is the least significant bit of the ROM select latch located
at &FE30 in the Master 128 and at &FE05 in the Electron.
17 Clock
This connection has different uses in the Electron and Master 128:
In the Electron: Clock is a 16MHz input with TTL levels.
In the Master 128:
Clock is a strap selectable function:
a) 16MHz input with TTL levels.
b) 8 MHz input with TTL levels.
The functions are selected by links on the host computer. The user
should ensure that the links are correct for a given application
and that proper termination is provided.
18 nROMSTB/nCRTCRST
This has different functions on the Electron and Master 128:
On the Electron:
nROMSTB is an active low input using TTL levels which selects the
location &FC73. This is intended to be used as a paging register.
On the Master 128:
nCRTCRST is an active low output signal meeting TTL levels of the
system CRTC reset input. It is provided for use in genlock
applications.
19 ADOUT - System audio output
This is the filtered output of the sum of all audio inputs to the
host computer.Significant load should not be taken from this node.
20 AGND - Audio Ground
This is the zero volt return for ADOUT. It should be used instead
of the system zero volt connection to reduce audio noise.
21 ADIN - Cartridge audio output
In the Electron: This is merely a connection from one cartridge to
the other.
In the Master 128: This is an output to the host computer audio
circuitry. It 'sees' an impedance of at least
1.0kOhms. Two cartridges with audio output should
not be inserted into the host computer together.
22 0V - Zero volts
This is the system earth return for digital signals.
SIDE 'B'
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 Second Processor fitted. No more than 10mA should be
drawn by a cartridge fitted to the Electron.
2 A10 - Address line 10 : Input with TTL levels
3 D3 - Data bus line 3 : Input/Output with TTL levels
4 A11 - Address line 11 : Input with TTL levels
5 A9 - Address line 9 : Input with TTL levels
6 D7 - Most significant data bus line : Input/Output with TTL levels
7 D6 - Data bus line 6 : Input/Output with TTL levels
8 D5 - Data bus line 5 : Input/Output with TTL levels
9 D4 - Data bus line 4 : Input/Output with TTL levels
00000000 81 2e 2e 0d 31 31 20 20 52 4e 57 2f 52 45 41 44 |....11 RNW/READ| 00000010 59 0d 20 20 20 20 54 68 69 73 20 68 61 73 20 64 |Y. This has d| 00000020 69 66 66 65 72 65 6e 74 20 66 75 6e 63 74 69 6f |ifferent functio| 00000030 6e 73 20 6f 6e 20 74 68 65 20 45 6c 65 63 74 72 |ns on the Electr| 00000040 6f 6e 20 61 6e 64 20 74 68 65 20 4d 61 73 74 65 |on and the Maste| 00000050 72 20 31 32 38 2e 0d 20 20 20 20 4f 6e 20 74 68 |r 128.. On th| 00000060 65 20 45 6c 65 63 74 72 6f 6e 3a 20 52 45 41 44 |e Electron: READ| 00000070 59 20 2d 20 43 50 55 20 77 61 69 74 20 73 74 61 |Y - CPU wait sta| 00000080 74 65 20 63 6f 6e 74 72 6f 6c 20 3a 20 4f 70 65 |te control : Ope| 00000090 6e 20 63 6f 6c 6c 65 63 74 6f 72 20 0d 20 20 20 |n collector . | 000000a0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000000b0 20 20 6f 75 74 70 75 74 2e 57 68 65 6e 20 64 72 | output.When dr| 000000c0 69 76 65 6e 20 6c 6f 77 2c 20 74 68 69 73 20 6c |iven low, this l| 000000d0 69 6e 65 20 77 69 6c 6c 20 63 61 75 73 65 20 74 |ine will cause t| 000000e0 68 65 20 0d 20 20 20 20 20 20 20 20 20 20 20 20 |he . | 000000f0 20 20 20 20 20 20 20 20 20 43 50 55 20 74 6f 20 | CPU to | 00000100 65 78 74 65 6e 64 20 69 74 73 20 63 79 63 6c 65 |extend its cycle| 00000110 20 75 6e 74 69 6c 20 52 45 41 44 59 20 69 73 20 | until READY is | 00000120 72 65 6c 65 61 73 65 64 2e 20 0d 20 20 20 20 20 |released. . | 00000130 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000140 54 68 69 73 20 77 69 6c 6c 20 6f 6e 6c 79 20 77 |This will only w| 00000150 6f 72 6b 20 6f 6e 20 45 6c 65 63 74 72 6f 6e 73 |ork on Electrons| 00000160 20 77 69 74 68 20 43 4d 4f 53 20 43 50 55 73 2e | with CMOS CPUs.| 00000170 20 0d 20 20 20 20 57 69 74 68 20 4e 4d 4f 53 20 | . With NMOS | 00000180 43 50 55 73 20 69 74 20 77 69 6c 6c 20 6f 6e 6c |CPUs it will onl| 00000190 79 20 77 6f 72 6b 20 6f 6e 20 72 65 61 64 20 63 |y work on read c| 000001a0 79 63 6c 65 73 2e 0d 20 20 20 20 4f 6e 20 74 68 |ycles.. On th| 000001b0 65 20 4d 61 73 74 65 72 20 31 32 38 3a 0d 20 20 |e Master 128:. | 000001c0 20 20 20 20 52 2f 57 20 2d 20 44 61 74 61 20 44 | R/W - Data D| 000001d0 69 72 65 63 74 69 6f 6e 20 43 6f 6e 74 72 6f 6c |irection Control| 000001e0 20 3a 20 49 6e 70 75 74 20 77 69 74 68 20 54 54 | : Input with TT| 000001f0 4c 20 6c 65 76 65 6c 73 0d 20 20 20 20 20 20 54 |L levels. T| 00000200 68 69 73 20 69 73 20 74 68 65 20 73 79 73 74 65 |his is the syste| 00000210 6d 20 64 61 74 61 20 62 75 66 66 65 72 20 64 69 |m data buffer di| 00000220 72 65 63 74 69 6f 6e 20 63 6f 6e 74 72 6f 6c 2e |rection control.| 00000230 20 20 49 66 20 6c 6f 77 2c 20 0d 20 20 20 20 20 | If low, . | 00000240 20 63 61 72 74 72 69 64 67 65 73 20 61 72 65 20 | cartridges are | 00000250 62 65 69 6e 67 20 77 72 69 74 74 65 6e 20 74 6f |being written to| 00000260 2e 49 66 20 68 69 67 68 20 61 6e 64 20 73 65 6c |.If high and sel| 00000270 65 63 74 65 64 20 74 68 65 79 20 6d 61 79 20 0d |ected they may .| 00000280 20 20 20 20 20 20 64 72 69 76 65 20 74 68 65 20 | drive the | 00000290 62 75 73 20 64 75 72 69 6e 67 20 50 48 31 32 2e |bus during PH12.| 000002a0 0d 0d 31 32 20 6e 4e 4d 49 20 2d 20 4e 6f 6e 20 |..12 nNMI - Non | 000002b0 6d 61 73 6b 61 62 6c 65 20 69 6e 74 65 72 72 75 |maskable interru| 000002c0 70 74 20 3a 20 4f 70 65 6e 20 63 6f 6c 6c 65 63 |pt : Open collec| 000002d0 74 6f 72 20 6f 75 74 70 75 74 0d 20 20 20 54 68 |tor output. Th| 000002e0 69 73 20 73 69 67 6e 61 6c 20 69 73 20 63 6f 6e |is signal is con| 000002f0 6e 65 63 74 65 64 20 74 6f 20 74 68 65 20 73 79 |nected to the sy| 00000300 73 74 65 6d 20 4e 4d 49 20 6c 69 6e 65 2e 20 49 |stem NMI line. I| 00000310 74 20 69 73 20 61 63 74 69 76 65 20 6c 6f 77 2e |t is active low.| 00000320 0d 0d 31 33 20 6e 49 52 51 20 2d 20 49 6e 74 65 |..13 nIRQ - Inte| 00000330 72 72 75 70 74 20 72 65 71 75 65 73 74 20 3a 20 |rrupt request : | 00000340 4f 70 65 6e 20 63 6f 6c 6c 65 63 74 6f 72 20 6f |Open collector o| 00000350 75 74 70 75 74 0d 20 20 20 54 68 69 73 20 73 69 |utput. This si| 00000360 67 6e 61 6c 20 69 73 20 63 6f 6e 6e 65 63 74 65 |gnal is connecte| 00000370 64 20 74 6f 20 74 68 65 20 73 79 73 74 65 6d 20 |d to the system | 00000380 49 52 51 20 6c 69 6e 65 2e 20 49 74 20 69 73 20 |IRQ line. It is | 00000390 61 63 74 69 76 65 20 6c 6f 77 2e 0d 0d 31 34 20 |active low...14 | 000003a0 6e 49 4e 46 43 20 2d 20 49 6e 74 65 72 6e 61 6c |nINFC - Internal| 000003b0 20 50 61 67 65 20 26 46 43 20 3a 20 4d 65 6d 6f | Page &FC : Memo| 000003c0 72 79 20 61 63 74 69 76 65 20 64 65 63 6f 64 65 |ry active decode| 000003d0 20 69 6e 70 75 74 20 3a 20 54 54 4c 20 61 63 74 | input : TTL act| 000003e0 69 76 65 20 0d 20 20 20 6c 6f 77 20 57 68 65 6e |ive . low When| 000003f0 20 62 69 74 20 49 46 4a 20 69 73 20 73 65 74 20 | bit IFJ is set | 00000400 69 6e 20 74 68 65 20 4d 61 73 74 65 72 20 31 32 |in the Master 12| 00000410 38 20 41 43 43 43 4f 4e 20 72 65 67 69 73 74 65 |8 ACCCON registe| 00000420 72 2c 20 61 6c 6c 20 0d 20 20 20 61 63 63 65 73 |r, all . acces| 00000430 73 65 73 20 74 6f 20 74 68 65 20 61 64 64 72 65 |ses to the addre| 00000440 73 73 20 72 61 6e 67 65 20 26 46 43 30 30 20 74 |ss range &FC00 t| 00000450 6f 20 26 46 43 46 46 20 77 69 6c 6c 20 63 61 75 |o &FCFF will cau| 00000460 73 65 20 74 68 69 73 20 73 65 6c 65 63 74 20 0d |se this select .| 00000470 20 20 20 74 6f 20 62 65 63 6f 6d 65 20 61 63 74 | to become act| 00000480 69 76 65 2e 20 54 68 65 20 41 43 43 43 4f 4e 20 |ive. The ACCCON | 00000490 61 63 63 65 73 73 20 69 73 20 6e 6f 74 20 61 70 |access is not ap| 000004a0 70 6c 69 63 61 62 6c 65 20 74 6f 20 74 68 65 20 |plicable to the | 000004b0 0d 20 20 20 45 6c 65 63 74 72 6f 6e 2e 0d 0d 31 |. Electron...1| 000004c0 35 20 6e 49 4e 46 44 20 2d 20 49 6e 74 65 72 6e |5 nINFD - Intern| 000004d0 61 6c 20 70 61 67 65 20 26 46 44 20 3a 20 4d 65 |al page &FD : Me| 000004e0 6d 6f 72 79 20 61 63 74 69 76 65 20 64 65 63 6f |mory active deco| 000004f0 64 65 20 69 6e 70 75 74 20 3a 20 54 54 4c 20 61 |de input : TTL a| 00000500 63 74 69 76 65 20 0d 20 20 20 6c 6f 77 2e 57 68 |ctive . low.Wh| 00000510 65 6e 20 62 69 74 20 49 46 4a 20 69 73 20 73 65 |en bit IFJ is se| 00000520 74 20 69 6e 20 74 68 65 20 4d 61 73 74 65 72 20 |t in the Master | 00000530 31 32 38 20 41 43 43 43 4f 4e 20 72 65 67 69 73 |128 ACCCON regis| 00000540 74 65 72 2c 20 61 6c 6c 20 0d 20 20 20 61 63 63 |ter, all . acc| 00000550 65 73 73 65 73 20 74 6f 20 74 68 65 20 61 64 64 |esses to the add| 00000560 72 65 73 73 20 72 61 6e 67 65 20 26 46 44 30 30 |ress range &FD00| 00000570 20 74 6f 20 26 46 44 46 46 20 77 69 6c 6c 20 63 | to &FDFF will c| 00000580 61 75 73 65 20 74 68 69 73 20 73 65 6c 65 63 74 |ause this select| 00000590 20 0d 20 20 20 74 6f 20 62 65 63 6f 6d 65 20 61 | . to become a| 000005a0 63 74 69 76 65 2e 20 54 68 65 20 41 43 43 43 4f |ctive. The ACCCO| 000005b0 4e 20 61 63 63 65 73 73 20 69 73 20 6e 6f 74 20 |N access is not | 000005c0 61 70 70 6c 69 63 61 62 6c 65 20 74 6f 20 74 68 |applicable to th| 000005d0 65 20 0d 20 20 20 45 6c 65 63 74 72 6f 6e 2e 0d |e . Electron..| 000005e0 0d 31 36 20 52 4f 4d 51 41 20 2d 20 4d 65 6d 6f |.16 ROMQA - Memo| 000005f0 72 79 20 70 61 67 69 6e 67 20 73 65 6c 65 63 74 |ry paging select| 00000600 20 3a 20 49 6e 70 75 74 20 77 69 74 68 20 54 54 | : Input with TT| 00000610 4c 20 6c 65 76 65 6c 73 0d 20 20 20 54 68 69 73 |L levels. This| 00000620 20 69 73 20 74 68 65 20 6c 65 61 73 74 20 73 69 | is the least si| 00000630 67 6e 69 66 69 63 61 6e 74 20 62 69 74 20 6f 66 |gnificant bit of| 00000640 20 74 68 65 20 52 4f 4d 20 73 65 6c 65 63 74 20 | the ROM select | 00000650 6c 61 74 63 68 20 6c 6f 63 61 74 65 64 20 0d 20 |latch located . | 00000660 20 20 61 74 20 26 46 45 33 30 20 69 6e 20 74 68 | at &FE30 in th| 00000670 65 20 4d 61 73 74 65 72 20 31 32 38 20 61 6e 64 |e Master 128 and| 00000680 20 61 74 20 26 46 45 30 35 20 69 6e 20 74 68 65 | at &FE05 in the| 00000690 20 45 6c 65 63 74 72 6f 6e 2e 0d 0d 31 37 20 20 | Electron...17 | 000006a0 43 6c 6f 63 6b 0d 20 20 20 20 54 68 69 73 20 63 |Clock. This c| 000006b0 6f 6e 6e 65 63 74 69 6f 6e 20 68 61 73 20 64 69 |onnection has di| 000006c0 66 66 65 72 65 6e 74 20 75 73 65 73 20 69 6e 20 |fferent uses in | 000006d0 74 68 65 20 45 6c 65 63 74 72 6f 6e 20 61 6e 64 |the Electron and| 000006e0 20 4d 61 73 74 65 72 20 31 32 38 3a 0d 20 20 20 | Master 128:. | 000006f0 20 49 6e 20 74 68 65 20 45 6c 65 63 74 72 6f 6e | In the Electron| 00000700 3a 20 43 6c 6f 63 6b 20 69 73 20 61 20 31 36 4d |: Clock is a 16M| 00000710 48 7a 20 69 6e 70 75 74 20 77 69 74 68 20 54 54 |Hz input with TT| 00000720 4c 20 6c 65 76 65 6c 73 2e 0d 20 20 20 20 49 6e |L levels.. In| 00000730 20 74 68 65 20 4d 61 73 74 65 72 20 31 32 38 3a | the Master 128:| 00000740 0d 20 20 20 20 20 20 43 6c 6f 63 6b 20 69 73 20 |. Clock is | 00000750 61 20 73 74 72 61 70 20 73 65 6c 65 63 74 61 62 |a strap selectab| 00000760 6c 65 20 66 75 6e 63 74 69 6f 6e 3a 0d 20 20 20 |le function:. | 00000770 20 20 20 61 29 20 20 31 36 4d 48 7a 20 69 6e 70 | a) 16MHz inp| 00000780 75 74 20 77 69 74 68 20 54 54 4c 20 6c 65 76 65 |ut with TTL leve| 00000790 6c 73 2e 0d 20 20 20 20 20 20 62 29 20 20 38 20 |ls.. b) 8 | 000007a0 4d 48 7a 20 69 6e 70 75 74 20 77 69 74 68 20 54 |MHz input with T| 000007b0 54 4c 20 6c 65 76 65 6c 73 2e 0d 20 20 20 20 54 |TL levels.. T| 000007c0 68 65 20 66 75 6e 63 74 69 6f 6e 73 20 61 72 65 |he functions are| 000007d0 20 73 65 6c 65 63 74 65 64 20 62 79 20 6c 69 6e | selected by lin| 000007e0 6b 73 20 6f 6e 20 74 68 65 20 68 6f 73 74 20 63 |ks on the host c| 000007f0 6f 6d 70 75 74 65 72 2e 20 54 68 65 20 75 73 65 |omputer. The use| 00000800 72 0d 20 20 20 20 73 68 6f 75 6c 64 20 65 6e 73 |r. should ens| 00000810 75 72 65 20 74 68 61 74 20 74 68 65 20 6c 69 6e |ure that the lin| 00000820 6b 73 20 61 72 65 20 63 6f 72 72 65 63 74 20 66 |ks are correct f| 00000830 6f 72 20 61 20 67 69 76 65 6e 20 61 70 70 6c 69 |or a given appli| 00000840 63 61 74 69 6f 6e 20 0d 20 20 20 20 61 6e 64 20 |cation . and | 00000850 74 68 61 74 20 70 72 6f 70 65 72 20 74 65 72 6d |that proper term| 00000860 69 6e 61 74 69 6f 6e 20 69 73 20 70 72 6f 76 69 |ination is provi| 00000870 64 65 64 2e 0d 0d 31 38 20 20 6e 52 4f 4d 53 54 |ded...18 nROMST| 00000880 42 2f 6e 43 52 54 43 52 53 54 0d 20 20 20 20 54 |B/nCRTCRST. T| 00000890 68 69 73 20 68 61 73 20 64 69 66 66 65 72 65 6e |his has differen| 000008a0 74 20 66 75 6e 63 74 69 6f 6e 73 20 6f 6e 20 74 |t functions on t| 000008b0 68 65 20 45 6c 65 63 74 72 6f 6e 20 61 6e 64 20 |he Electron and | 000008c0 4d 61 73 74 65 72 20 31 32 38 3a 0d 20 20 20 20 |Master 128:. | 000008d0 4f 6e 20 74 68 65 20 45 6c 65 63 74 72 6f 6e 3a |On the Electron:| 000008e0 0d 20 20 20 20 6e 52 4f 4d 53 54 42 20 69 73 20 |. nROMSTB is | 000008f0 61 6e 20 61 63 74 69 76 65 20 6c 6f 77 20 69 6e |an active low in| 00000900 70 75 74 20 75 73 69 6e 67 20 54 54 4c 20 6c 65 |put using TTL le| 00000910 76 65 6c 73 20 77 68 69 63 68 20 73 65 6c 65 63 |vels which selec| 00000920 74 73 20 74 68 65 0d 20 20 20 20 6c 6f 63 61 74 |ts the. locat| 00000930 69 6f 6e 20 26 46 43 37 33 2e 20 20 54 68 69 73 |ion &FC73. This| 00000940 20 69 73 20 69 6e 74 65 6e 64 65 64 20 74 6f 20 | is intended to | 00000950 62 65 20 75 73 65 64 20 61 73 20 61 20 70 61 67 |be used as a pag| 00000960 69 6e 67 20 72 65 67 69 73 74 65 72 2e 0d 20 20 |ing register.. | 00000970 20 20 4f 6e 20 74 68 65 20 4d 61 73 74 65 72 20 | On the Master | 00000980 31 32 38 3a 0d 20 20 20 20 6e 43 52 54 43 52 53 |128:. nCRTCRS| 00000990 54 20 69 73 20 61 6e 20 61 63 74 69 76 65 20 6c |T is an active l| 000009a0 6f 77 20 6f 75 74 70 75 74 20 73 69 67 6e 61 6c |ow output signal| 000009b0 20 6d 65 65 74 69 6e 67 20 54 54 4c 20 6c 65 76 | meeting TTL lev| 000009c0 65 6c 73 20 6f 66 20 74 68 65 0d 20 20 20 20 73 |els of the. s| 000009d0 79 73 74 65 6d 20 43 52 54 43 20 72 65 73 65 74 |ystem CRTC reset| 000009e0 20 69 6e 70 75 74 2e 20 20 49 74 20 69 73 20 70 | input. It is p| 000009f0 72 6f 76 69 64 65 64 20 66 6f 72 20 75 73 65 20 |rovided for use | 00000a00 69 6e 20 67 65 6e 6c 6f 63 6b 20 0d 20 20 20 20 |in genlock . | 00000a10 61 70 70 6c 69 63 61 74 69 6f 6e 73 2e 0d 0d 31 |applications...1| 00000a20 39 20 20 41 44 4f 55 54 20 2d 20 53 79 73 74 65 |9 ADOUT - Syste| 00000a30 6d 20 61 75 64 69 6f 20 6f 75 74 70 75 74 0d 20 |m audio output. | 00000a40 20 20 20 54 68 69 73 20 69 73 20 74 68 65 20 66 | This is the f| 00000a50 69 6c 74 65 72 65 64 20 6f 75 74 70 75 74 20 6f |iltered output o| 00000a60 66 20 74 68 65 20 73 75 6d 20 6f 66 20 61 6c 6c |f the sum of all| 00000a70 20 61 75 64 69 6f 20 69 6e 70 75 74 73 20 74 6f | audio inputs to| 00000a80 20 74 68 65 20 0d 20 20 20 20 68 6f 73 74 20 63 | the . host c| 00000a90 6f 6d 70 75 74 65 72 2e 53 69 67 6e 69 66 69 63 |omputer.Signific| 00000aa0 61 6e 74 20 6c 6f 61 64 20 73 68 6f 75 6c 64 20 |ant load should | 00000ab0 6e 6f 74 20 62 65 20 74 61 6b 65 6e 20 66 72 6f |not be taken fro| 00000ac0 6d 20 74 68 69 73 20 6e 6f 64 65 2e 0d 0d 32 30 |m this node...20| 00000ad0 20 20 41 47 4e 44 20 2d 20 41 75 64 69 6f 20 47 | AGND - Audio G| 00000ae0 72 6f 75 6e 64 0d 20 20 20 20 54 68 69 73 20 69 |round. This i| 00000af0 73 20 74 68 65 20 7a 65 72 6f 20 76 6f 6c 74 20 |s the zero volt | 00000b00 72 65 74 75 72 6e 20 66 6f 72 20 41 44 4f 55 54 |return for ADOUT| 00000b10 2e 20 20 49 74 20 73 68 6f 75 6c 64 20 62 65 20 |. It should be | 00000b20 75 73 65 64 20 69 6e 73 74 65 61 64 20 0d 20 20 |used instead . | 00000b30 20 20 6f 66 20 74 68 65 20 73 79 73 74 65 6d 20 | of the system | 00000b40 7a 65 72 6f 20 76 6f 6c 74 20 63 6f 6e 6e 65 63 |zero volt connec| 00000b50 74 69 6f 6e 20 74 6f 20 72 65 64 75 63 65 20 61 |tion to reduce a| 00000b60 75 64 69 6f 20 6e 6f 69 73 65 2e 0d 0d 32 31 20 |udio noise...21 | 00000b70 20 41 44 49 4e 20 2d 20 43 61 72 74 72 69 64 67 | ADIN - Cartridg| 00000b80 65 20 61 75 64 69 6f 20 6f 75 74 70 75 74 0d 20 |e audio output. | 00000b90 20 20 20 49 6e 20 74 68 65 20 45 6c 65 63 74 72 | In the Electr| 00000ba0 6f 6e 3a 20 54 68 69 73 20 69 73 20 6d 65 72 65 |on: This is mere| 00000bb0 6c 79 20 61 20 63 6f 6e 6e 65 63 74 69 6f 6e 20 |ly a connection | 00000bc0 66 72 6f 6d 20 6f 6e 65 20 63 61 72 74 72 69 64 |from one cartrid| 00000bd0 67 65 20 74 6f 20 0d 20 20 20 20 20 20 20 20 20 |ge to . | 00000be0 20 20 20 20 20 20 20 20 20 20 20 20 74 68 65 20 | the | 00000bf0 6f 74 68 65 72 2e 0d 20 20 20 20 49 6e 20 74 68 |other.. In th| 00000c00 65 20 4d 61 73 74 65 72 20 31 32 38 3a 20 54 68 |e Master 128: Th| 00000c10 69 73 20 69 73 20 61 6e 20 6f 75 74 70 75 74 20 |is is an output | 00000c20 74 6f 20 74 68 65 20 68 6f 73 74 20 63 6f 6d 70 |to the host comp| 00000c30 75 74 65 72 20 61 75 64 69 6f 20 0d 20 20 20 20 |uter audio . | 00000c40 20 20 20 20 20 20 20 20 20 20 20 20 20 20 63 69 | ci| 00000c50 72 63 75 69 74 72 79 2e 20 49 74 20 27 73 65 65 |rcuitry. It 'see| 00000c60 73 27 20 61 6e 20 69 6d 70 65 64 61 6e 63 65 20 |s' an impedance | 00000c70 6f 66 20 61 74 20 6c 65 61 73 74 20 0d 20 20 20 |of at least . | 00000c80 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 31 | 1| 00000c90 2e 30 6b 4f 68 6d 73 2e 20 54 77 6f 20 63 61 72 |.0kOhms. Two car| 00000ca0 74 72 69 64 67 65 73 20 77 69 74 68 20 61 75 64 |tridges with aud| 00000cb0 69 6f 20 6f 75 74 70 75 74 20 73 68 6f 75 6c 64 |io output should| 00000cc0 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |. | 00000cd0 20 20 20 6e 6f 74 20 62 65 20 69 6e 73 65 72 74 | not be insert| 00000ce0 65 64 20 69 6e 74 6f 20 74 68 65 20 68 6f 73 74 |ed into the host| 00000cf0 20 63 6f 6d 70 75 74 65 72 20 74 6f 67 65 74 68 | computer togeth| 00000d00 65 72 2e 0d 0d 32 32 20 20 30 56 20 2d 20 5a 65 |er...22 0V - Ze| 00000d10 72 6f 20 76 6f 6c 74 73 0d 20 20 20 20 54 68 69 |ro volts. Thi| 00000d20 73 20 69 73 20 74 68 65 20 73 79 73 74 65 6d 20 |s is the system | 00000d30 65 61 72 74 68 20 72 65 74 75 72 6e 20 66 6f 72 |earth return for| 00000d40 20 64 69 67 69 74 61 6c 20 73 69 67 6e 61 6c 73 | digital signals| 00000d50 2e 0d 0d 53 49 44 45 20 27 42 27 0d 0d 31 20 20 |...SIDE 'B'..1 | 00000d60 2b 35 56 20 2d 20 50 6f 77 65 72 20 73 75 70 70 |+5V - Power supp| 00000d70 6c 79 0d 20 20 20 54 68 69 73 20 69 73 20 74 68 |ly. This is th| 00000d80 65 20 73 79 73 74 65 6d 20 6c 6f 67 69 63 20 73 |e system logic s| 00000d90 75 70 70 6c 79 20 72 61 69 6c 2e 20 20 4e 6f 20 |upply rail. No | 00000da0 6d 6f 72 65 20 74 68 61 6e 20 31 35 30 6d 41 20 |more than 150mA | 00000db0 73 68 6f 75 6c 64 20 62 65 0d 20 20 20 64 72 61 |should be. dra| 00000dc0 77 6e 20 62 79 20 61 20 63 61 72 74 72 69 64 67 |wn by a cartridg| 00000dd0 65 20 69 6e 20 61 20 66 75 6c 6c 79 20 63 6f 6e |e in a fully con| 00000de0 66 69 67 75 72 65 64 20 4d 61 73 74 65 72 20 31 |figured Master 1| 00000df0 32 38 20 63 6f 6d 70 75 74 65 72 2c 20 69 65 20 |28 computer, ie | 00000e00 0d 20 20 20 77 69 74 68 20 69 6e 74 65 72 6e 61 |. with interna| 00000e10 6c 20 53 65 63 6f 6e 64 20 50 72 6f 63 65 73 73 |l Second Process| 00000e20 6f 72 20 66 69 74 74 65 64 2e 20 20 4e 6f 20 6d |or fitted. No m| 00000e30 6f 72 65 20 74 68 61 6e 20 31 30 6d 41 20 73 68 |ore than 10mA sh| 00000e40 6f 75 6c 64 20 62 65 20 0d 20 20 20 64 72 61 77 |ould be . draw| 00000e50 6e 20 62 79 20 61 20 63 61 72 74 72 69 64 67 65 |n by a cartridge| 00000e60 20 66 69 74 74 65 64 20 74 6f 20 74 68 65 20 45 | fitted to the E| 00000e70 6c 65 63 74 72 6f 6e 2e 0d 0d 32 20 20 41 31 30 |lectron...2 A10| 00000e80 20 2d 20 41 64 64 72 65 73 73 20 6c 69 6e 65 20 | - Address line | 00000e90 31 30 20 3a 20 49 6e 70 75 74 20 77 69 74 68 20 |10 : Input with | 00000ea0 54 54 4c 20 6c 65 76 65 6c 73 0d 0d 33 20 20 44 |TTL levels..3 D| 00000eb0 33 20 2d 20 44 61 74 61 20 62 75 73 20 6c 69 6e |3 - Data bus lin| 00000ec0 65 20 33 20 3a 20 49 6e 70 75 74 2f 4f 75 74 70 |e 3 : Input/Outp| 00000ed0 75 74 20 77 69 74 68 20 54 54 4c 20 6c 65 76 65 |ut with TTL leve| 00000ee0 6c 73 0d 0d 34 20 20 41 31 31 20 2d 20 41 64 64 |ls..4 A11 - Add| 00000ef0 72 65 73 73 20 6c 69 6e 65 20 31 31 20 3a 20 49 |ress line 11 : I| 00000f00 6e 70 75 74 20 77 69 74 68 20 54 54 4c 20 6c 65 |nput with TTL le| 00000f10 76 65 6c 73 0d 0d 35 20 20 41 39 20 2d 20 41 64 |vels..5 A9 - Ad| 00000f20 64 72 65 73 73 20 6c 69 6e 65 20 39 20 3a 20 49 |dress line 9 : I| 00000f30 6e 70 75 74 20 77 69 74 68 20 54 54 4c 20 6c 65 |nput with TTL le| 00000f40 76 65 6c 73 0d 0d 36 20 20 44 37 20 2d 20 4d 6f |vels..6 D7 - Mo| 00000f50 73 74 20 73 69 67 6e 69 66 69 63 61 6e 74 20 64 |st significant d| 00000f60 61 74 61 20 62 75 73 20 6c 69 6e 65 20 3a 20 49 |ata bus line : I| 00000f70 6e 70 75 74 2f 4f 75 74 70 75 74 20 77 69 74 68 |nput/Output with| 00000f80 20 54 54 4c 20 6c 65 76 65 6c 73 0d 0d 37 20 20 | TTL levels..7 | 00000f90 44 36 20 2d 20 44 61 74 61 20 62 75 73 20 6c 69 |D6 - Data bus li| 00000fa0 6e 65 20 36 20 3a 20 49 6e 70 75 74 2f 4f 75 74 |ne 6 : Input/Out| 00000fb0 70 75 74 20 77 69 74 68 20 54 54 4c 20 6c 65 76 |put with TTL lev| 00000fc0 65 6c 73 0d 0d 38 20 20 44 35 20 2d 20 44 61 74 |els..8 D5 - Dat| 00000fd0 61 20 62 75 73 20 6c 69 6e 65 20 35 20 3a 20 49 |a bus line 5 : I| 00000fe0 6e 70 75 74 2f 4f 75 74 70 75 74 20 77 69 74 68 |nput/Output with| 00000ff0 20 54 54 4c 20 6c 65 76 65 6c 73 0d 0d 39 20 20 | TTL levels..9 | 00001000 44 34 20 2d 20 44 61 74 61 20 62 75 73 20 6c 69 |D4 - Data bus li| 00001010 6e 65 20 34 20 3a 20 49 6e 70 75 74 2f 4f 75 74 |ne 4 : Input/Out| 00001020 70 75 74 20 77 69 74 68 20 54 54 4c 20 6c 65 76 |put with TTL lev| 00001030 65 6c 73 0d 0d |els..| 00001035
F/+MCART2.m0
F/+MCART2.m1
F/+MCART2.m2
F/+MCART2.m4
F/+MCART2.m5
.