Msx Eprom

015 COMPUTERS The "64 Kbyte RAM extension for msx computers"(Ref. 1) can house moms, but there is a small problem. To keep the board lay- out as simple as possible, the data and address lines on the exten- sion board were not connected sequentially. With RAMS that does not matter too much and, in principle, not with EPROMS either, but 12 their programming becomes a bit of a tangle. To prevent that, it is possible to use the auxiliary board shown here, which ensures that the address and data lines are connected to the correct pins of the lc. The board may be adapted to two types of EPROM by means of a wire link. With the link between A and B, a Type 27128 EPROM (16 K) may be used; if a 32 K EPROM is to be used, the link should be laid between A and C. The two RAMS on the extension board each take two pages (a total of 32 K) in the address memory (pages 0/1 and 2/3 respec- tively). That means that when a Type 27128 EPROM is used, the 20 17 05 15 D3 DI D2 MSX EPROM O 0-O a 26 4 24 AS...