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F/+HINT1
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_30.ADF |
| Filename: | F/+HINT1 |
| Read OK: | ✔ |
| File size: | 0DF9 bytes |
| Load address: | 2B204556 |
| Exec address: | 544E4948 |
File contents
Acorn Electron Plus One: Disabling the Centronics and A/D Port
Applicable Hardware: Acorn Electron
We have received a number of enquiries regarding the Plus One with other
software houses products, which make use of some of the locations reserved
in the operating system. Such software usually works on the Acorn
Electron alone, but not with the Plus One fitted. Issuing the command *FX
163,128,1 as described in the User Guide may be sufficient to enable the
software to be used; if not the following code will remove the Plus One
completely from the address map disabling the Centronics and A/D ports
(additionally disabling the RS423 cartridge if fitted).
Pressing <BREAK> will return the Electron to its normal state. The
routine can be saved on cassette/disc and CHAINed prior to loading the
required program.
10 *FX 163,128,1
20 A%=&AA : X%=0 : Y%=&FF
30 !&80=USR&FFF4 : A%=!&81
40 A%?12=0
NB: This routine will not operate across the tube.
Acorn Electron Cartridge Interface Specification
-------------------------------------------------
This specification details the characteristics of the Cartridge interface
as fitted to the Acorn Electron and BBC Master 128 computers.
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
2.1 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' respectively. 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.
2.2 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 n0E - 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.
00000000 0d 41 63 6f 72 6e 20 45 6c 65 63 74 72 6f 6e 20 |.Acorn Electron | 00000010 50 6c 75 73 20 4f 6e 65 3a 20 44 69 73 61 62 6c |Plus One: Disabl| 00000020 69 6e 67 20 74 68 65 20 43 65 6e 74 72 6f 6e 69 |ing the Centroni| 00000030 63 73 20 61 6e 64 20 41 2f 44 20 50 6f 72 74 0d |cs and A/D Port.| 00000040 0d 41 70 70 6c 69 63 61 62 6c 65 20 48 61 72 64 |.Applicable Hard| 00000050 77 61 72 65 3a 20 41 63 6f 72 6e 20 45 6c 65 63 |ware: Acorn Elec| 00000060 74 72 6f 6e 0d 0d 0d 57 65 20 68 61 76 65 20 72 |tron...We have r| 00000070 65 63 65 69 76 65 64 20 61 20 6e 75 6d 62 65 72 |eceived a number| 00000080 20 6f 66 20 65 6e 71 75 69 72 69 65 73 20 72 65 | of enquiries re| 00000090 67 61 72 64 69 6e 67 20 74 68 65 20 50 6c 75 73 |garding the Plus| 000000a0 20 4f 6e 65 20 77 69 74 68 20 6f 74 68 65 72 0d | One with other.| 000000b0 73 6f 66 74 77 61 72 65 20 68 6f 75 73 65 73 20 |software houses | 000000c0 70 72 6f 64 75 63 74 73 2c 20 77 68 69 63 68 20 |products, which | 000000d0 6d 61 6b 65 20 75 73 65 20 6f 66 20 73 6f 6d 65 |make use of some| 000000e0 20 6f 66 20 74 68 65 20 6c 6f 63 61 74 69 6f 6e | of the location| 000000f0 73 20 72 65 73 65 72 76 65 64 0d 69 6e 20 74 68 |s reserved.in th| 00000100 65 20 6f 70 65 72 61 74 69 6e 67 20 73 79 73 74 |e operating syst| 00000110 65 6d 2e 20 20 53 75 63 68 20 73 6f 66 74 77 61 |em. Such softwa| 00000120 72 65 20 75 73 75 61 6c 6c 79 20 77 6f 72 6b 73 |re usually works| 00000130 20 6f 6e 20 74 68 65 20 41 63 6f 72 6e 0d 45 6c | on the Acorn.El| 00000140 65 63 74 72 6f 6e 20 61 6c 6f 6e 65 2c 20 62 75 |ectron alone, bu| 00000150 74 20 6e 6f 74 20 77 69 74 68 20 74 68 65 20 50 |t not with the P| 00000160 6c 75 73 20 4f 6e 65 20 66 69 74 74 65 64 2e 20 |lus One fitted. | 00000170 20 49 73 73 75 69 6e 67 20 74 68 65 20 63 6f 6d | Issuing the com| 00000180 6d 61 6e 64 20 2a 46 58 0d 31 36 33 2c 31 32 38 |mand *FX.163,128| 00000190 2c 31 20 61 73 20 64 65 73 63 72 69 62 65 64 20 |,1 as described | 000001a0 69 6e 20 74 68 65 20 55 73 65 72 20 47 75 69 64 |in the User Guid| 000001b0 65 20 6d 61 79 20 62 65 20 73 75 66 66 69 63 69 |e may be suffici| 000001c0 65 6e 74 20 74 6f 20 65 6e 61 62 6c 65 20 74 68 |ent to enable th| 000001d0 65 0d 73 6f 66 74 77 61 72 65 20 74 6f 20 62 65 |e.software to be| 000001e0 20 75 73 65 64 3b 20 69 66 20 6e 6f 74 20 74 68 | used; if not th| 000001f0 65 20 66 6f 6c 6c 6f 77 69 6e 67 20 63 6f 64 65 |e following code| 00000200 20 77 69 6c 6c 20 72 65 6d 6f 76 65 20 74 68 65 | will remove the| 00000210 20 50 6c 75 73 20 4f 6e 65 0d 63 6f 6d 70 6c 65 | Plus One.comple| 00000220 74 65 6c 79 20 66 72 6f 6d 20 74 68 65 20 61 64 |tely from the ad| 00000230 64 72 65 73 73 20 6d 61 70 20 64 69 73 61 62 6c |dress map disabl| 00000240 69 6e 67 20 74 68 65 20 43 65 6e 74 72 6f 6e 69 |ing the Centroni| 00000250 63 73 20 61 6e 64 20 41 2f 44 20 70 6f 72 74 73 |cs and A/D ports| 00000260 0d 28 61 64 64 69 74 69 6f 6e 61 6c 6c 79 20 64 |.(additionally d| 00000270 69 73 61 62 6c 69 6e 67 20 74 68 65 20 52 53 34 |isabling the RS4| 00000280 32 33 20 63 61 72 74 72 69 64 67 65 20 69 66 20 |23 cartridge if | 00000290 66 69 74 74 65 64 29 2e 0d 0d 50 72 65 73 73 69 |fitted)...Pressi| 000002a0 6e 67 20 3c 42 52 45 41 4b 3e 20 77 69 6c 6c 20 |ng <BREAK> will | 000002b0 72 65 74 75 72 6e 20 74 68 65 20 45 6c 65 63 74 |return the Elect| 000002c0 72 6f 6e 20 74 6f 20 69 74 73 20 6e 6f 72 6d 61 |ron to its norma| 000002d0 6c 20 73 74 61 74 65 2e 20 20 54 68 65 0d 72 6f |l state. The.ro| 000002e0 75 74 69 6e 65 20 63 61 6e 20 62 65 20 73 61 76 |utine can be sav| 000002f0 65 64 20 6f 6e 20 63 61 73 73 65 74 74 65 2f 64 |ed on cassette/d| 00000300 69 73 63 20 61 6e 64 20 43 48 41 49 4e 65 64 20 |isc and CHAINed | 00000310 70 72 69 6f 72 20 74 6f 20 6c 6f 61 64 69 6e 67 |prior to loading| 00000320 20 74 68 65 0d 72 65 71 75 69 72 65 64 20 70 72 | the.required pr| 00000330 6f 67 72 61 6d 2e 0d 0d 09 31 30 20 20 2a 46 58 |ogram....10 *FX| 00000340 20 31 36 33 2c 31 32 38 2c 31 0d 09 32 30 20 20 | 163,128,1..20 | 00000350 41 25 3d 26 41 41 20 3a 20 58 25 3d 30 20 3a 20 |A%=&AA : X%=0 : | 00000360 59 25 3d 26 46 46 0d 09 33 30 20 20 21 26 38 30 |Y%=&FF..30 !&80| 00000370 3d 55 53 52 26 46 46 46 34 20 3a 20 41 25 3d 21 |=USR&FFF4 : A%=!| 00000380 26 38 31 0d 09 34 30 20 20 41 25 3f 31 32 3d 30 |&81..40 A%?12=0| 00000390 0d 0d 0d 4e 42 3a 20 20 54 68 69 73 20 72 6f 75 |...NB: This rou| 000003a0 74 69 6e 65 20 77 69 6c 6c 20 6e 6f 74 20 6f 70 |tine will not op| 000003b0 65 72 61 74 65 20 61 63 72 6f 73 73 20 74 68 65 |erate across the| 000003c0 20 74 75 62 65 2e 0d 0d 0d 0d 41 63 6f 72 6e 20 | tube.....Acorn | 000003d0 45 6c 65 63 74 72 6f 6e 20 43 61 72 74 72 69 64 |Electron Cartrid| 000003e0 67 65 20 49 6e 74 65 72 66 61 63 65 20 53 70 65 |ge Interface Spe| 000003f0 63 69 66 69 63 61 74 69 6f 6e 0d 2d 2d 2d 2d 2d |cification.-----| 00000400 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| * 00000420 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0d 0d 54 68 |------------..Th| 00000430 69 73 20 73 70 65 63 69 66 69 63 61 74 69 6f 6e |is specification| 00000440 20 64 65 74 61 69 6c 73 20 74 68 65 20 63 68 61 | details the cha| 00000450 72 61 63 74 65 72 69 73 74 69 63 73 20 6f 66 20 |racteristics of | 00000460 74 68 65 20 43 61 72 74 72 69 64 67 65 20 69 6e |the Cartridge in| 00000470 74 65 72 66 61 63 65 0d 61 73 20 66 69 74 74 65 |terface.as fitte| 00000480 64 20 74 6f 20 74 68 65 20 41 63 6f 72 6e 20 45 |d to the Acorn E| 00000490 6c 65 63 74 72 6f 6e 20 61 6e 64 20 42 42 43 20 |lectron and BBC | 000004a0 4d 61 73 74 65 72 20 31 32 38 20 63 6f 6d 70 75 |Master 128 compu| 000004b0 74 65 72 73 2e 20 0d 0d 54 68 65 20 73 70 65 63 |ters. ..The spec| 000004c0 69 66 69 63 61 74 69 6f 6e 20 64 65 74 61 69 6c |ification detail| 000004d0 73 20 74 68 65 20 70 68 79 73 69 63 61 6c 20 61 |s the physical a| 000004e0 6e 64 20 65 6c 65 63 74 72 69 63 61 6c 20 63 68 |nd electrical ch| 000004f0 61 72 61 63 74 65 72 69 73 74 69 63 73 20 61 6e |aracteristics an| 00000500 64 0d 73 6f 66 74 77 61 72 65 20 65 6e 76 69 72 |d.software envir| 00000510 6f 6e 6d 65 6e 74 20 6f 66 20 74 68 65 20 63 61 |onment of the ca| 00000520 72 74 72 69 64 67 65 73 2e 0d 0d 0d 31 2e 30 20 |rtridges....1.0 | 00000530 20 54 65 72 6d 69 6e 6f 6c 6f 67 79 0d 0d 43 4d | Terminology..CM| 00000540 4f 53 20 20 2d 20 20 43 6f 6d 70 6c 65 6d 65 6e |OS - Complemen| 00000550 74 61 72 79 20 6d 65 74 61 6c 2d 6f 78 69 64 65 |tary metal-oxide| 00000560 2d 73 69 6c 69 63 6f 6e 20 74 65 63 68 6e 6f 6c |-silicon technol| 00000570 6f 67 79 0d 0d 43 50 55 20 20 20 20 2d 20 54 68 |ogy..CPU - Th| 00000580 65 20 6d 69 63 72 6f 70 72 6f 63 65 73 73 6f 72 |e microprocessor| 00000590 20 69 6e 20 74 68 65 20 68 6f 73 74 20 63 6f 6d | in the host com| 000005a0 70 75 74 65 72 0d 0d 54 54 4c 20 20 20 20 2d 20 |puter..TTL - | 000005b0 54 72 61 6e 73 69 73 74 6f 72 2f 54 72 61 6e 73 |Transistor/Trans| 000005c0 69 73 74 6f 72 20 4c 6f 67 69 63 0d 0d 26 20 20 |istor Logic..& | 000005d0 20 20 20 20 2d 20 41 73 20 61 20 6e 75 6d 62 65 | - As a numbe| 000005e0 72 20 70 72 65 66 69 78 20 6d 65 61 6e 73 20 61 |r prefix means a| 000005f0 20 68 65 78 61 64 65 63 69 6d 61 6c 20 6e 75 6d | hexadecimal num| 00000600 62 65 72 20 66 6f 6c 6c 6f 77 73 0d 0d 6e 20 20 |ber follows..n | 00000610 20 20 20 20 2d 20 41 73 20 61 20 73 69 67 6e 61 | - As a signa| 00000620 6c 20 70 72 65 66 69 78 20 6d 65 61 6e 73 20 74 |l prefix means t| 00000630 68 65 20 73 69 67 6e 61 6c 20 69 73 20 61 63 74 |he signal is act| 00000640 69 76 65 20 6c 6f 77 0d 0d 0d 32 2e 31 20 20 48 |ive low...2.1 H| 00000650 6f 73 74 20 43 6f 6d 70 75 74 65 72 20 43 6f 6e |ost Computer Con| 00000660 6e 65 63 74 69 6f 6e 0d 0d 43 61 72 74 72 69 64 |nection..Cartrid| 00000670 67 65 73 20 70 6c 75 67 20 69 6e 74 6f 20 61 20 |ges plug into a | 00000680 34 34 20 77 61 79 20 67 6f 6c 64 20 70 6c 61 74 |44 way gold plat| 00000690 65 64 20 65 64 67 65 20 63 6f 6e 6e 65 63 74 6f |ed edge connecto| 000006a0 72 20 61 72 72 61 6e 67 65 64 20 6f 6e 20 65 61 |r arranged on ea| 000006b0 63 68 0d 73 69 64 65 20 6f 66 20 61 20 30 2e 30 |ch.side of a 0.0| 000006c0 35 20 69 6e 63 68 20 73 6c 6f 74 20 61 73 20 32 |5 inch slot as 2| 000006d0 32 20 77 61 79 73 20 6f 66 20 30 2e 30 35 22 20 |2 ways of 0.05" | 000006e0 78 20 30 2e 35 22 20 6f 6e 20 30 2e 31 22 20 63 |x 0.5" on 0.1" c| 000006f0 65 6e 74 72 65 73 2e 20 20 54 68 65 0d 63 6f 6e |entres. The.con| 00000700 6e 65 63 74 6f 72 73 20 61 72 65 20 70 61 72 61 |nectors are para| 00000710 6c 6c 65 6c 20 74 6f 20 74 68 65 20 66 72 6f 6e |llel to the fron| 00000720 74 20 6f 66 20 74 68 65 20 63 6f 6d 70 75 74 65 |t of the compute| 00000730 72 20 77 69 74 68 20 74 68 65 20 66 72 6f 6e 74 |r with the front| 00000740 20 61 6e 64 0d 72 65 61 72 20 66 61 63 69 6e 67 | and.rear facing| 00000750 20 73 69 64 65 73 20 64 65 73 69 67 6e 61 74 65 | sides designate| 00000760 64 20 27 42 27 20 61 6e 64 20 27 41 27 20 72 65 |d 'B' and 'A' re| 00000770 73 70 65 63 74 69 76 65 6c 79 2e 20 20 50 69 6e |spectively. Pin| 00000780 20 31 20 6f 66 20 65 61 63 68 20 73 69 64 65 0d | 1 of each side.| 00000790 69 73 20 6f 6e 20 74 68 65 20 66 61 72 20 72 69 |is on the far ri| 000007a0 67 68 74 2e 20 20 54 68 69 73 20 69 73 20 73 68 |ght. This is sh| 000007b0 6f 77 6e 20 69 6e 20 44 69 61 67 72 61 6d 20 31 |own in Diagram 1| 000007c0 2e 0d 0d 43 61 72 74 72 69 64 67 65 73 20 61 72 |...Cartridges ar| 000007d0 65 20 61 6c 69 67 6e 65 64 20 61 6e 64 20 70 6f |e aligned and po| 000007e0 6c 61 72 69 73 65 64 20 62 79 20 74 68 65 20 63 |larised by the c| 000007f0 61 73 65 3b 20 74 68 65 79 20 61 72 65 20 70 6c |ase; they are pl| 00000800 75 67 67 65 64 0d 76 65 72 74 69 63 61 6c 6c 79 |ugged.vertically| 00000810 20 69 6e 74 6f 20 74 68 65 20 68 6f 73 74 2e 20 | into the host. | 00000820 20 41 6c 6c 20 63 61 72 74 72 69 64 67 65 73 20 | All cartridges | 00000830 63 6f 6e 73 74 72 75 63 74 65 64 20 74 6f 20 74 |constructed to t| 00000840 68 65 20 74 69 6d 65 20 6f 66 0d 77 72 69 74 69 |he time of.writi| 00000850 6e 67 20 68 61 76 65 20 74 68 65 20 63 6f 6d 70 |ng have the comp| 00000860 6f 6e 65 6e 74 73 20 6d 6f 75 6e 74 65 64 20 6f |onents mounted o| 00000870 6e 20 74 68 65 20 70 63 62 20 27 41 27 20 73 69 |n the pcb 'A' si| 00000880 64 65 2e 0d 0d 0d 32 2e 32 20 20 50 69 6e 6f 75 |de....2.2 Pinou| 00000890 74 0d 0d 54 68 65 20 70 69 6e 73 20 61 72 65 20 |t..The pins are | 000008a0 64 65 73 63 72 69 62 65 64 20 61 73 20 73 65 65 |described as see| 000008b0 6e 20 66 72 6f 6d 20 74 68 65 20 63 61 72 74 72 |n from the cartr| 000008c0 69 64 67 65 73 3b 20 69 65 20 61 6e 20 69 6e 70 |idges; ie an inp| 000008d0 75 74 20 74 6f 20 74 68 65 0d 63 61 72 74 72 69 |ut to the.cartri| 000008e0 64 67 65 2e 0d 0d 53 49 44 45 20 27 41 27 0d 0d |dge...SIDE 'A'..| 000008f0 31 20 20 20 2b 35 56 20 2d 20 50 6f 77 65 72 20 |1 +5V - Power | 00000900 73 75 70 70 6c 79 0d 20 20 20 20 20 54 68 69 73 |supply. This| 00000910 20 69 73 20 74 68 65 20 73 79 73 74 65 6d 20 6c | is the system l| 00000920 6f 67 69 63 20 73 75 70 70 6c 79 20 72 61 69 6c |ogic supply rail| 00000930 2e 20 20 4e 6f 20 6d 6f 72 65 20 74 68 61 6e 20 |. No more than | 00000940 31 35 30 6d 41 20 73 68 6f 75 6c 64 20 62 65 0d |150mA should be.| 00000950 64 72 61 77 6e 20 62 79 20 61 20 63 61 72 74 72 |drawn by a cartr| 00000960 69 64 67 65 20 69 6e 20 61 20 66 75 6c 6c 79 20 |idge in a fully | 00000970 63 6f 6e 66 69 67 75 72 65 64 20 4d 61 73 74 65 |configured Maste| 00000980 72 20 31 32 38 20 63 6f 6d 70 75 74 65 72 2c 20 |r 128 computer, | 00000990 69 65 20 77 69 74 68 0d 69 6e 74 65 72 6e 61 6c |ie with.internal| 000009a0 20 63 6f 2d 70 72 6f 63 65 73 73 6f 72 20 66 69 | co-processor fi| 000009b0 74 74 65 64 2e 20 20 4e 6f 20 6d 6f 72 65 20 74 |tted. No more t| 000009c0 68 61 6e 20 35 30 6d 41 20 73 68 6f 75 6c 64 20 |han 50mA should | 000009d0 62 65 20 64 72 61 77 6e 20 62 79 20 61 0d 63 61 |be drawn by a.ca| 000009e0 72 74 72 69 64 67 65 20 66 69 74 74 65 64 20 74 |rtridge fitted t| 000009f0 6f 20 74 68 65 20 45 6c 65 63 74 72 6f 6e 2e 0d |o the Electron..| 00000a00 0d 32 20 20 20 6e 30 45 20 2d 20 4f 75 74 70 75 |.2 n0E - Outpu| 00000a10 74 20 45 6e 61 62 6c 65 20 3a 20 49 6e 70 75 74 |t Enable : Input| 00000a20 20 77 69 74 68 20 43 4d 4f 53 20 6c 65 76 65 6c | with CMOS level| 00000a30 73 20 0d 20 20 20 20 20 54 68 69 73 20 69 73 20 |s . This is | 00000a40 61 6e 20 61 63 74 69 76 65 20 6c 6f 77 20 73 69 |an active low si| 00000a50 67 6e 61 6c 20 64 75 72 69 6e 67 20 74 68 65 20 |gnal during the | 00000a60 50 48 31 32 20 70 65 72 69 6f 64 20 6f 66 20 74 |PH12 period of t| 00000a70 68 65 20 73 79 73 74 65 6d 0d 63 6c 6f 63 6b 2e |he system.clock.| 00000a80 20 20 49 74 20 69 73 20 69 6e 74 65 6e 64 65 64 | It is intended| 00000a90 20 74 6f 20 73 77 69 74 63 68 20 6f 6e 20 74 68 | to switch on th| 00000aa0 65 20 6f 75 74 70 75 74 20 62 75 66 66 65 72 73 |e output buffers| 00000ab0 20 6f 66 20 6d 65 6d 6f 72 79 20 64 65 76 69 63 | of memory devic| 00000ac0 65 73 0d 69 6e 20 63 61 72 74 72 69 64 67 65 73 |es.in cartridges| 00000ad0 2e 20 20 49 74 20 69 73 20 6e 6f 74 20 67 75 61 |. It is not gua| 00000ae0 72 61 6e 74 65 65 64 20 74 6f 20 62 65 20 68 69 |ranteed to be hi| 00000af0 67 68 20 61 74 20 6f 74 68 65 72 20 74 69 6d 65 |gh at other time| 00000b00 73 2e 0d 0d 20 20 20 20 20 54 68 65 20 66 72 6f |s... The fro| 00000b10 6e 74 20 63 61 72 74 72 69 64 67 65 20 73 6c 6f |nt cartridge slo| 00000b20 74 20 69 73 20 61 6c 6c 6f 63 61 74 65 64 20 74 |t is allocated t| 00000b30 6f 20 73 79 73 74 65 6d 20 52 4f 4d 20 70 6f 73 |o system ROM pos| 00000b40 69 74 69 6f 6e 73 20 30 20 61 6e 64 0d 31 2e 20 |itions 0 and.1. | 00000b50 20 54 68 65 20 72 65 61 72 20 73 6c 6f 74 20 69 | The rear slot i| 00000b60 73 20 61 6c 6c 6f 63 61 74 65 64 20 74 6f 20 70 |s allocated to p| 00000b70 6f 73 69 74 69 6f 6e 73 20 32 20 61 6e 64 20 33 |ositions 2 and 3| 00000b80 2e 0d 0d 33 20 20 20 6e 52 53 54 20 2d 20 53 79 |...3 nRST - Sy| 00000b90 73 74 65 6d 20 52 65 73 65 74 20 3a 20 49 6e 70 |stem Reset : Inp| 00000ba0 75 74 20 77 69 74 68 20 43 4d 4f 53 20 6c 65 76 |ut with CMOS lev| 00000bb0 65 6c 73 0d 20 20 20 20 20 54 68 69 73 20 73 69 |els. This si| 00000bc0 67 6e 61 6c 20 69 73 20 61 63 74 69 76 65 20 6c |gnal is active l| 00000bd0 6f 77 20 64 75 72 69 6e 67 20 73 79 73 74 65 6d |ow during system| 00000be0 20 72 65 73 65 74 2e 20 20 49 74 20 69 73 20 6e | reset. It is n| 00000bf0 6f 74 0d 73 79 6e 63 68 72 6f 6e 69 73 65 64 20 |ot.synchronised | 00000c00 74 6f 20 61 6e 79 20 69 6e 74 65 72 6e 61 6c 20 |to any internal | 00000c10 63 6c 6f 63 6b 2e 0d 0d 34 20 20 20 43 53 52 57 |clock...4 CSRW| 00000c20 20 2d 20 43 68 69 70 20 53 65 6c 65 63 74 20 2f | - Chip Select /| 00000c30 20 52 65 61 64 2f 57 72 69 74 65 20 3a 20 49 6e | Read/Write : In| 00000c40 70 75 74 20 77 69 74 68 20 43 4d 4f 53 20 6c 65 |put with CMOS le| 00000c50 76 65 6c 73 0d 20 20 20 20 20 4f 6e 20 74 68 65 |vels. On the| 00000c60 20 45 6c 65 63 74 72 6f 6e 3a 0d 20 20 20 20 20 | Electron:. | 00000c70 54 68 69 73 20 70 69 6e 20 69 73 20 74 68 65 20 |This pin is the | 00000c80 43 50 55 20 72 65 61 64 2f 77 72 69 74 65 20 6c |CPU read/write l| 00000c90 69 6e 65 2e 0d 0d 20 20 20 20 20 4f 6e 20 74 68 |ine... On th| 00000ca0 65 20 4d 61 73 74 65 72 20 31 32 38 3a 0d 20 20 |e Master 128:. | 00000cb0 20 20 20 54 68 69 73 20 70 69 6e 20 63 68 61 6e | This pin chan| 00000cc0 67 65 73 20 66 75 6e 63 74 69 6f 6e 20 61 63 63 |ges function acc| 00000cd0 6f 72 64 69 6e 67 20 74 6f 20 74 68 65 20 6d 65 |ording to the me| 00000ce0 6d 6f 72 79 20 72 65 67 69 6f 6e 20 74 68 61 74 |mory region that| 00000cf0 20 74 68 65 20 43 50 55 0d 69 73 20 61 64 64 72 | the CPU.is addr| 00000d00 65 73 73 69 6e 67 2e 20 20 44 75 72 69 6e 67 20 |essing. During | 00000d10 61 63 63 65 73 73 65 73 20 74 6f 20 64 65 76 69 |accesses to devi| 00000d20 63 65 73 20 69 6e 20 74 68 65 20 72 65 67 69 6f |ces in the regio| 00000d30 6e 20 26 46 43 30 30 20 74 6f 20 26 46 45 46 46 |n &FC00 to &FEFF| 00000d40 20 69 74 0d 69 73 20 65 71 75 69 76 61 6c 65 6e | it.is equivalen| 00000d50 74 20 74 6f 20 74 68 65 20 43 50 55 20 72 65 61 |t to the CPU rea| 00000d60 64 2f 77 72 69 74 65 20 6c 69 6e 65 20 64 75 72 |d/write line dur| 00000d70 69 6e 67 20 6e 50 48 31 32 2e 20 20 46 6f 72 20 |ing nPH12. For | 00000d80 61 6c 6c 20 6f 74 68 65 72 0d 61 63 63 65 73 73 |all other.access| 00000d90 65 73 20 69 74 20 69 73 20 61 6e 20 61 63 74 69 |es it is an acti| 00000da0 76 65 20 68 69 67 68 20 63 68 69 70 20 73 65 6c |ve high chip sel| 00000db0 65 63 74 20 66 6f 72 20 6d 65 6d 6f 72 79 20 64 |ect for memory d| 00000dc0 65 76 69 63 65 73 2e 20 20 49 74 20 69 73 20 6e |evices. It is n| 00000dd0 6f 74 0d 67 75 61 72 61 6e 74 65 65 64 20 74 6f |ot.guaranteed to| 00000de0 20 62 65 20 6c 6f 77 20 61 74 20 6f 74 68 65 72 | be low at other| 00000df0 20 74 69 6d 65 73 2e 0d 0d | times...| 00000df9
F/+HINT1.m0
F/+HINT1.m1
F/+HINT1.m2
F/+HINT1.m4
F/+HINT1.m5
.