TSM : 16R4

TSM is a 16R4 device whose major function is control of the dynamic RAM. For
inputs, it has the decoded RAM enable signal, along with the address and data
strobes from the processor which signify whether the data transfer will be low
byte, hi byte, or word. From these the RAS and CAS strobes are generated, and
the row/column address multiplexer is controlled. Until there were PALs, this
type of dynamic RAM control function required either about 10-20 discrete TTL
packages, or a 40 pin LSI dynamic RAM controller which usually didn't do what
you wanted anyway.

/TSEN0  /CS     11              10              GND
/CASL    O      12              9        I      /LDS
/CASR    O      13              8        I      /UDS
/RAS     R      14              7        I      /AS
TC       R      15              6        I      /ROM
C1M      R      16              5        I      /RAM
C4M      R      17              4        I      VID/u*
C2M      O      18              3        I      C8M
/DTACK   O      19              2        I      C16M
Vcc             20              1       CLK     C16M

From Kryten's (now gone) page:

Apple Mac Timing State Machine, PAL16R8

NB: Not verified yet!

PAL16R8  PAL DESIGN SPECIFICATIONS

16MBUF C16M 8M MU RAMEN ROMEN AS UDS LDS GND 
TSEN CAS0 CAS1 RAS TC 1M 4M 2M DTACK VCC

RAS is the DRAM Row Address Strobe.

RAS: =       /4M *             /RAS
     +  8M *  4M *             /RAS + 
     + /8M *  4M *       /2M * /RAS
     +  8M * /4M *  1M *        RAS
     +  8M * /4M * /1M *  2M *  RAS
     + /8M *  4M * /1M *        RAS *  LDS
     + /8M *  4M * /1M *        RAS *  UDS
     + /8M *  4M * /1M *        RAS * /LDS * /UDS * /CAS0
     + 

TC goes to the LAG and to the video counter (U1F)

TC:= 8M + /4M + 2M +  /1M + RAS

1M: =      /8M *  4M * /2M * 1M * /RAS + 
     /1M *  8M * /4M * /RAS + 
     /1M * /8M *  4M * 2M * /RAS + 
     /1M *              RAS + 
     /1M * /8M * /4M * /RAS + 
     /1M * 8M *   4M * /RAS

4M: =                    1M *  RAS + 
       8M *  4M *  2M * /1M *  RAS + 
      /8M * /4M *       /1M *  RAS + 
       8M * /4M *  2M * /1M *  RAS + 
      /8M *  4M * /2M *       /RAS + 
there may be a line missing here..... 

2M: = /C16M *       /8M * /4M * /RAS
    +         /2M + /8M + /4M 
    +         /2M + /1M + * /TC
    +  C16M * /2M
    + /C16M * /8M * /4M * /1M * RAS * /ROMEN * /RAMEN * /AS
    + /2M * 4M
    + /2M * 8M * /4M *1M * MU

DTACK := /C16M * /8M * /4M *        /RAS * /AS * /ROMEN *  RAMEN
      +  /C16M * /8M * /4M * /1M  * /RAS * /AS * /RAMEN *  ROMEN
      +  /C16M * /8M * /4M *  1M  * /RAS * /AS * /RAMEN *  ROMEN * /MU
      +  /C16M * /8M *  4M * /1M  *  RAS * /AS * /RAMEN * /ROMEN
      +  /DTACK * /UDS
      +  /DATACK * /LDS
      +  /DATACK * /RAS

This is probably not right for the Mac Plus...

CAS0: =  4M * /2M *       /RAS * /DTACK * /RAMEN * ROMEN * /LDS * MU
      +  4M * /2M * 1M * /RAS * MU
      + /CAS0 
      + /RAS
      +  8M + 4M + /2M * /1M * RAS * /DTACK
      + /CAS0 * /2M + /1M

CAS1: = 4M * /2M *              /RAS * /DTACK * /RAMEN * ROMEN * /UDS * MU
      + 4M * /2M * 1M *         /RAS *                                  MU
      +                 /CAS1 + /RAS