Scor­pio News


April–June 1987 – Volume 1. Issue 2

Page 45 of 51

The MPI is supplied either ready built, or as akit. A-number of options are available:

FOC and Winchester controller (2797 or 2793 FOC Controller, depending upon system)

‘The board or kit 12 supplied with ehe appropriate combination of options a Ordered. The PCB ia the standard 8" aquere, with the usuel Map 60 blue resist ‘and high qualicy Kit assembly is quire straightforward and the instructions are reasonably clear – there is a separate assembly manual which T didn’t Feceive but s phone call to Map soon solved the problea.

There are 22 Links on the boerd, some of which are not needed for standard Configurations and «20 way Link header to be wired up if one vants the $10 and/or CTC facilities Details of the link functions and also the changes hecessary to accommodate the 2793 controller, if the board is to beused at a Iueae/Nascom compatible FDC, are provided.

‘A slight disadvantage 42 that the instructions are not very clear on which Links fre needed for particular uses = sy boards have Links 2 (a-b),3 3 (a-b).8 (a> a). 13 (em), e (a- 13m) 18 (acc), 16 (COM-B), 17 (bec},18 (28, 4-3), and 21 (a clk). Map will supply details of modifications required to read odd disk Formate with bad side 2 flage, which wight be necessary 4f you wish to wee thefr Format transfer progremt No details ave provided of the crystal Exequencies or types required for on-board frequency generation.

‘he 810 and CTC seen co be standard dmplenentations using the 2804 CTC and ST Chips. ‘The ciecuitey around the 2/97 seems to be almgst identical to thee

‘on Che VPC nnd the AG485 Interface te provided oy ditterentini Tine ariver and Fecelver (75174/75175), in conteast co the R5232 interface which uses the Eonventional 75188 and 75169 types.

My main use for the MPI is as a Floppy/Winchester controller and both the ready-buiit and kit versions have performed without trouble vith a vide range of other boards from Nascom, Map and Gemini In particular, the combination of the MPI with TEAC compatible drives and the Map version of CP/M Plus provides fast, quiet disk access = T hate nofay computers!

As I sometimes need to copy disks with peculiar formats, the small modifications Co the beard for this purpose are easily made I’don’t need to use either the S10 or CTC functions (although they are implemented on one of the boards) T use the Serial o/p on the Map or Gemini cP board for this,

‘the fully-assembled version with FDC, CTC and S10 options is possibly a bit pricey av £195 + VAT but money can be raved by building the kit youreel? – not Long job – possibly a couple of evenings. Host users need only the FDC/SAST version and this ig quite a bit cheaper T haven’t seen an up-to-date price Tis feom Gemini or Map but suspect that the ready built FOC/SASI is about. the same price as the GMe29 or GHaig (Cie5, in the last price list I saw from

Te ‘would be worth contacting Map to see what their current prices are

I can thoroughly recommend this product for anyone contemplating upgrading an

‘a0 BUS system even if they already have the Gemini #09 FOC, since it will enable

them to take full advantage of higher access speeds and quieter operation If the

newer TEAC-compatibie drives are used. (Ed. – alternatively readers may like to fe the GH809 modifications shown elsewhere in this issue ]

This is an OCR’d version of the scanned page and likely contains recognition errors.

Page 45 of 51