ATPL Sidewise manual - Retro-kit
Contents
1. Page 112. SYMPHONY 4 octave electronic keyboard turns your BBC into a versatile musical instrument taking full advantage of the sound generation capabilities of the computer SYMPHONY OPTIONS SUSTAIN FOOTSWITCH 6 95 50p p p Complete with cable and Jack plug 5 WATT AMPLIFIER 39 50 3 00 p p In robust vinyl covered cabinet Phones and Input sockets Tone and volume controls 340x290x210 mm AMPLIFIER INTERFACE KIT 5 89 50p p p v4 Jack socket mounts through Econet hole Pre Wired for installation without soldering SYMPHONY ACORN MUSIC 500 SOFTWARE 14 95 50p p p Allows the SYMPHONY keyboard to be used in conjunction with the MUSIC 500 Synthesiser Now with Sequencer SIDEWISE 38 00 1 00 p p Sideways ROM RAM expansion board for the BBC microcomputer provides for an expansion of an additional 12 Sideways ROMs SIDEWISE OPTIONS 8K LOW POWER CMOS RAM 8 00 per pair 50p P P BATTERY BACK UP KIT FOR THE ABOVE 17 00 50p p p AUTOPROM 98 00 2 00 p p EPROM programmer for BBC with facility for the contents of a ROM to be downloaded and rum from on board on power up INSIDE OUT 13 00 50p p p Allows extension of one Sideways ROM socket out of the BBC allowing ROMs to be exchanged without opening the case BREAK LOCK 8 53 50p p p This is a two position lockable keyswitch which is mounted in the ash tray which allows the BREAK key to be isolated thereby preventing accidental loss of data In addi
3. has been split into two 8K sockets 15a and 15b to allow use of 8K byte CMOS RAM chips and therefore provides support for up to 16K of SIDEWAYS RAM The logic is arranged such that any write performed to the SIDEWAYS ROM area of the machine will access the RAM directly irrespective of and without affecting the current ROM selected The RAM may be read as a normal SIDEWAYS ROM by writing the appropriate number into the latch at HEX FE30 as performed by the OS The most obvious application of the RAM option is in the development of SIDEWAYS ROM software as the interaction with the OS may be checked out in the true SIDEWAYS ROM environment The RAM option will also allow you to download SIDEWAYS ROM software from cassette or disc and then to run as normal By addition of a few components the RAM may be backed up by a battery to allow for retention of data in the RAM even with the power to the computer removed A WRITE PROTECT facility may be added to the board simply by fitting a switch as may a RAM READ DISABLE facility to get you out of trouble should your development software CRASH within the RAM and lock you out of the machine It is also possible to fit an 8K ROM together with 8K RAM as device number 15 thereby allowing a ROM to have private access to its own 8K RAM workspace In standard form SIDEWISE is supplied ready to PLUG IN AND GO no soldering being required The board will accept 16K of RAM simply by inserting appropriate devi
4. AT ADVANCED TECHNOLOGY PRODUCTS LIMITED PL SIDEWISE USER MANUAL SECTION CONTENTS Page 1 WHAT ARE SIDEWAYS ROMs 2 2 ROM FILING SYSTEM 2 3 INTRODUCING SIDEWISE 2 4 CONNECTION TO THE BBC COMPUTER 3 5 BATTERY BACKED RAM OPTION 5 6 LINK SELECTABLE OPTIONS 6 TABLE 1 8 SIDEWISE LAYOUT DIAGRAM 9 Station Road Clowne Chesterfield S43 4AB ENGLAND TEL Chesterfield 0246 811585 4 lines c p 1983 ATPL SECTION 1 WHAT ARE SIDEWAYS ROMs The BBC COMPUTER incorporates facilities whereby a number of applications programs may be resident in the machine in firmware e g ROM or EPROM memory and which may be called upon by the user via the operating system to perform specific tasks such as word processing floppy disc management and so on The memory is organised in such a way that only one such SIDEWAYS ROM may be active at any instant in time and all communication between such ROMs must be performed via the operating system Each SIDEWAYS RCM occupies the same physical area of the BBC COMPUTER memory map namely 8000 BEFF HEX SIDEWAYS ROMs therefore provide a convenient method of expanding the memory of the BBC COMPUTER The BBC COMPUTER OPERATING SYSTEM OS requires that all software for SIDEWAYS ROM application be written to obey specific rules regarding communications with the OS This aspect may become quite complicated but a useful application note is available from CUSTOMER SERVICES DEPARTMENT ACORN COMPUTER
5. EWISE board Another possibility is that the two flying leads onto S21 have been inserted the wrong way round N B Failure to comply with ATPL installation instructions will invalidate any possible warranty claim If in doubt regarding the installation procedure please feel free to contact ATPL for guidance ATPL standard terms and conditions of sale available on request It has been brought to our attention that some Model Bs and upgraded Model As do not switch between ROMs This is because IC76 74LS163 is not fitted or wire links 12 aid S13 are not cut open circuit To enable paging of ROMs IC76 must therefore be fitted AND 12 and S13 should be cut Similarly there are apparently several ROMs available which cause interaction problems when combined in a system This is generally due to the offending ROMs not obeying the operating system correctly in terms of workspace used and is typically not associated with using ROM extension boards SECTION 5 BATTERY BACKED RAM OPTION As supplied SIDEWISE will accept up to 16K RAN in the two special sockets 15a aid 15b The RAM is written to by any write instruction to the SIDEWAYS ROM area addresses in the range 8000 BFFF hex The write access will override the currently selected SIDEWAYS ROM causing data to be stored on the RAM chips This data may then only be read by selecting ROM NUMBER 15 in the normal way This allows a FILING SYSTEM ROM which may be itself a SIDEWAYS ROM to co
6. S LTD CAMBRIDGE TECHNO PARK 645 NEWMARKET ROAD CAMBRIDGE CB5 8PD TELEPHONE 0223 214411 and is entitled BBC MICROCOMPUTER SIDEWAYS ROMs Fortunately many of the mere serious applications software packages are available in ROM form which greatly enhance the facilities offered by the machine SECTION 2 ROM FILING SYSTEM A special application of the SIDEWAYS ROM is the ROM FILING SYSTEM referred to but not explained in the USER GUIDE on page 472 It is possible to generate EPROMs again formatted in a specific way containing your favourite programs allowing you to have them instantaneously available in the firmware of the machine The data is stored on the EPROM in a form very similar to the cassette file format This specific application of SIDEWAYS ROMs does not however save you any memory as the programs must be downloaded into RAM to execute unlike SIDEWAYS ROMs such as BASIC DFS and others However the ability to have programs and data stored in ROM in this form is very useful in many applications SECTION 3 INTRODUCING SIDEWISE The ATPL SIDEWISE BOARD provides an expansion of the SIDEWAYS ROM facility of the BBC COMPUTER increasing support from four devices up to the maximum of sixteen supported by the OS Each device may be either 8K or 16K bytes in standard configuration with some useful options selectable by links on the board see section 6 SIDEWISE c p 1983 ATPL Page 1 The socket for ROM number 15
7. bent any pins If you do not have this device fitted SIDEWISE c p 1983 ATPL Page 2 do not worry it is not essential to the functioning of SIDEWISE 6 These two devices may now be re inserted into the corresponding sockets on the SIDEWISE board being careful to observe correct orientation and insertion of the devices 7 Carefully ease off one of the pair of push on power supply connector leads adjacent to IC32 Holding the female connector between finger and thumb gently bend the connector over at 90 as shown Now replace the connector and repeat for the other one of the pair Position of power connectors on BBC oe Rend power p connector at 90 y Ig 8 Remove the shorting link from the lower half of S21 This is situated close to the centre of the main board i e ANALOGUE a jej 522 REMOVE THIS LINK BZ s20 m Save the link for future use by placing it on the spare pin of S20 9 Connect the flying leads from SIDEWISE to the vacated S21 ensuring that the wire marked EI is to the right 10 Position the SIDEWISE connector pins directly over the sockets of IC51 and IC73 and observing pin alignment firmly push each connector in turn starting with the rear one into the respective socket to ensure good contact 11 In order that the BBC COMPUTER will power up into BASIC the BASIC ROM should be removed from the main board and inserted into the ROM SOCKET marked 14 in the SIDEWISE layout diagram Thi
8. ces but the battery backup circuit and RAM chips are available at extra cost as a kit from ATPL SECTION 4 CONNECTION TO THE BBC COMPUTER On RE of SIDEWISE the following installation procedure MUST be followed carefully It is ESSENTIAL that your machine contains an operating system which will support SIDEWAYS ROMs Some early machines were provided with the OPERATING SYSTEM in EPROM mounted on a carrier board Unfortunately this carrier may not be used with the SIDEWISE board as it will foul on the keyboard If your machine is like this it will be necessary for you to obtain a 1 2 OS R M Your local dealer should be able to provide this bit if in doubt please contact ATPL 1 Ensure that the BBC COMPUTER is switched OFF and the mains plug is removed 2 Remove the lid of the machine by releasing the four screws on the case marked FIX 3 Disconnect the keyboard cable from its connector on the main circuit board and remove the two keyboard retaining bolts thereby releasing the keyboard Remove the loudspeaker connecting lead from its connector 4 Carefully remove the OS ROM from its socket being careful not to bend any pins This is IC51 on the main board and is the leftmost 28 pin device of the five situated immediately behind the keyboard to the right of the machine 5 Now remove the A D CONVERTER chip 1C73 This is situated at the rear of the machine in front of the ANALOGUE IN socket Again be careful not to
9. ndard form SIDEWISE is supplied to accept the following devices ROM ONLY SOCKETS ROM 4 thru ROM 14 2764 or 27128 EPROMs i e 8K or 16K and equivalent MASKED ROM devices such as BASIC ROM RAM SOCKETS ROM 15a 2764 addressed from 8000 9FFF or CMOS RAM ROM 15b 2764 addressed from A000 BFFF or CMOS RAM The standard configuration will therefore permit one 16K program to be split across two 8K devices and used in sockets 15a and 15b SIDEWISE provides several link options to permit other configurations These are detailed below and summarised in TABLE 1 The default conditions are formed as part of the p c b etch and should be CAREFULLY cut with a modelling knife if it is desired to change the link position S1 This selects the power source for socket number 15b to originate from either the main 5v supply or from the battery backup supply if the battery backup option is installed Default condition is to 5v direction NORTH S2 This has a similar effect to S1 but applies to socket number 15a Default condition is to 5v direction NORTH B3 When made joins the battery backup supply rail to the main 5v supply to ensure operation without the battery backup circuit installed Default condition MADE SIDEWISE c p 1983 ATPL Page 5 S4 When made socket number 15a is mapped into 8000 9FFF 8K With S4 and S5 both not made socket number 15a is effectively disabled chip select pulled high to the power
10. ntrol the loading of a file to this RAM area without affecting itself A not altogether useful example might be the BASIC line FORX amp 8000 TO amp BFFF X X NEXT This will make a copy of the BASIC ROM in the SIDEWAYS RAM The contents of any Sideways ROM or RAM may be read by use of the operating system OSRDRM call at amp FFB9 On entry Y should be set to SIDEWISE c p 1983 ATPL Page 4 the ROM number 0 amp F and locations amp F6 amp F7 should contain the address of the byte to be read On exit A will contain the value of the byte read Note that this is an undocumented operating system call By addition of a few suitable components the RAM may be backed up by a rechargeable battery allowing data to be retained for long periods of the order of months with power to the BBC COMPUTER removed A suitable upgrade kit with fitting instructions is obtainable from ATPL The kit comprises battery aid charging circuit together with a low voltage detection circuit to shut down the RAM as the power supply voltage rail falls For lowest standby power consumption we recommend that only true low power RAMs such as TC5565LP or HM6264LP are used the Low Power suffix is important Note that the RAM option will function without the battery circuit it being a simple matter of inserting the one or two RAM chips as required however in this case data will NOT be retained when power is removed SECTION 6 LINK SELECTABLE OPTIONS In sta
11. number 15a see S4 and S5 S8 should be made in the WEST direction in order to apply address line A13 to pin 26 Mote that it is possible to have an 8K EPROM in socket 15a and RAM in socket 15b irrespective of S8 Default condition is EAST SIDEWISE c p 1983 ATPL Page 6 LINK SI S2 S3 S4 S5 S6 S7 S8 DIRECTION MADE MADE MADE MADE EAST WEST EAST Vcc main 5v supply Vbb battery supply DENOTES DEFAULT POSITION OF LINK Absence of indicates NOT made SIDEWISE c p 1983 ATPL TABLE 1 ACTION Power to 15b from Vcc Power to 15b from Vbb Power to 15a from Vcc Power to 15a from Vbb Connects Vcc to Vbb for no battery circuit 15a enabled from 8000 9FFF 8k Do NOT make with S5 made Also provides RAM inhibit 15a enabled from 8000 BFFF 16k Do NOT make with S4 made Vacate 15b Inhibit write to 15a 15b Provides WRITE PROTECT for RAM 4k or 8k devices in 4 5 6 8k or 16k devices in 4 5 6 Secondary chip select to pin 26 of 15a refer to S4 S5 Page 7 SINEWISE LAYOUT DIAGRAM p ARG A D C SOCKET RAM RAM ROM ROM158 0 S ROM S1 52 SOCKE T SIDEWAYS ROM RAM Bidewisel pa fel ex o so Po r EL esi K C R6 KEYBOARD SIDE OF BBC COMPUTER SIDEWISE c p 1983 ATPL Page 8 ALSO AVAILABLE FROM ATPL ref RH1 17 NOTE All prices are excluding VAT SYMPHONY 105 70 3 50 p p The
12. rail of socket number 15a allowing any garbage in this device to be ignored This facility is useful for disabling the RAM devices to prevent the machine hanging up on a badly formatted SIDEWAYS RAM program This link must NOT be made at the same time as S5 Default condition MADE S5 When made socket number 15a is mapped into 8000 BFFF 16K This permits use of a 16K device in socket number 15a Socket number 15b will still be enabled from A000 BFFF as normal and hence must be vacated to avoid possible conflict S5 must NOT be made at the same time as S4 Default condition NOT MADE When made inhibits write access to sockets 15a and 15b A suggested way of applying S6 with the RAM option fitted is to hard wire a single pole switch across So The switch may then be conveniently mounted at the rear of the machine to provide a WRITE PROTECT facility for the RAM Default condition NOT MADE S7 This two way link permits use of 2732 4K devices in sockets 4 5 and 6 only When made to EAST pin 26 of sockets 4 5 and 6 is connected to 5v Devices may therefore be either 2732 or 2764 When made to WEST pin 26 is connected to address line A13 Devices may then be either 2764 or 27128 Default condition is WEST S8 This link controls the secondary chip select signal on pin 26 of socket number 15a With RAM fitted in socket 15a S8 should be made in the EAST direction to provide secondary chip select With a 16K device in socket
13. s is required as the BBC COMPUTER treats ROM NUMBER 15 as highest priority in its search of the SIDEWAYS ROMs ROM NUMBER 0 is the lowest priority With SIDEWISE fitted the four sockets on the main board are now ROM NUMBERS 0 1 2 3 SIDEWISE is supplied with ROM NUMBER 15 split into two 8K devices in order that RAM may be easily added to the system ROM NUMBER 14 is therefore the highest priority 16K socket Refer to SIDEWISE c p 1983 ATPL Page 3 section 6 for changing the configuration of ROM NUMBER 15 12 Re assemble the machine in reverse order Do NOT forget the loudspeaker lead Note polarity of this lead is not important 13 Re connect the machine and switch on The machine should now function as normal except that you now have a further twelve SIDEWAYS ROM sockets available Should the machine fail to function check to ensure that you have followed the above instructions carefully paying particular attention to orientation and insertion of all devices aid connectors Typical problems which might occur due to faulty insertion are a SCREEN SHOWS NOTHING AT SWITCH ON This is normally the OS ROM or its connector badly inserted Also check that the BASIC and OS ROMs have not been interchanged Of course you may have forgotten the connection to the monitor b SCREEN SHOWS No language ROM AT SWITCH ON This is normally due to faulty insertion of the connector into IC73 causing the OS ROM not to recognise the SID
14. tion the machine may be locked in a disabled state thereby rendering it unusable by unauthorised persons DISC SOFTWARE FROM ATPL SPOOLIT 10 00 50p p p Allows Sideways RAM on SIDEWISE to be used as a printer buffer TURBOPROMI 10 00 50p p p Uses a fast programming algorithm to greatly reduce programming time of EPROMs when used in conjunction with AUTOPROM DES SHIFT 10 00 50p p p Available for ACORN 0 90 and 1 2 DFS only moves the workspace required by the DFS into Sideways RAM allowing reclamation of DES workspace Note either ACORN DFS 0 90 or 1 2 MUST be resident in ROM in your system SIDESWIPE 10 00 50p p p SIDEWISE c p 1983 ATPL Page 9 Allows Sideways ROM RAM contents to be transferred to disc direct from the computer SIDEWISE c p 1983 ATPL Page 10 NOTE ON BENDING POWER CONNECTORS We have recently purchased a BBC computer with hard plastic power connectors These are most easily identified by their sharp cornered rectangular shape We could not bend the connectors by hand alone however we could damage them by forcing them over the edge of a table DON T DO THIS Instead if you have one of these BBC s please proceed as follows CUT THE PLASTIC FOR BBC COMPUTERS ONLY ON THE FLAT CUT WITH THESE CRIMPS SIDE OF THE CRIMP This replaces section 7 on page 4 of the manual SIDEWISE c p 1983 ATPL THEN BEND AT RIGHT ANGLES WITH THE STEP ON THE INSIDE OF THE BEND
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