SLOT6 board





=C ROM data=

CR0~CR31 are multiplexed by 32 74LS151 8-to-1 data selectors. See Graphic glitches.


 * K28: CR0
 * K29: CR1
 * K30: CR2
 * J28: CR3
 * J29: CR4
 * J30: CR5
 * H28: CR6
 * H29: CR7
 * H30: CR8
 * G28: CR9
 * G29: CR10
 * G30: CR11
 * F28: CR12
 * F29: CR13
 * F30: CR14
 * E28: CR15
 * E29: CR16
 * E30: CR17
 * D28: CR18
 * D29: CR19
 * K3: CR20
 * K2: CR21
 * J3: CR22
 * J2: CR23
 * H3: CR24
 * H2: CR25
 * G3: CR26
 * G2: CR27
 * G1: CR82
 * F3: CR29
 * F2: CR30
 * F1: CR31

=S ROM data=

FIXD0~FIXD7 are multiplexed by 8 74LS151 8-to-1 data selectors. See Graphic glitches.


 * E3: FIXD0
 * E2: FIXD1
 * D3: FIXD2
 * D2: FIXD3
 * D1: FIXD4
 * C3: FIXD5
 * C2: FIXD6
 * C1: FIXD7

=Blocks=

Chip 1, 2 & 3: 74F244 68k address lines




Chip 11 & 13: 74LS245 PCM-A ROM multiplexed bus 0~23


Note: it looks like SDRADx and sSDRADx are swapped on chip 11 schematic compared to real board.

Chip 12 & 14: 74LS245 PCM-B ROM multiplexed bus 0~11


Note: it looks like SDRADx and sSDRADx are swapped on chip 12 schematic compared to real board.