FRAM71B
User’s Manual
FRAM71B 1.00
- 16 -
©Hans Brueggemann, 2016
PORT(5.02): 16 K RAM
MM_2, Chip_11, 16 K, LCIM, RAM
This is the maximum configuration in conjunction with the HPIL module. Note that MM_2 is
configured to "A" = 16 KByte. Attempting to configure it to a higher value will result in
"WRN:Configuration", or will make your HP-71B unresponsive
2)
.
Other "MAX” configurations are as follows:
MAX RAM, no modules
"93 94 95 96 97 98 99 9A 9B 9C 9D 9E BF 00 …"
à
408 KB RAM
MAX RAM, FORTH
"93 E4 95 96 97 98 99 9A 9B 9C 9D AE …" (93 is HC, E4 is SC ROM for FORTH)
à
320 KB RAM
MAX RAM, IL & FORTH
"93 E4 95 96 97 98 99 9A 9B 9C 9D AE …" (93 is HC, E4 is SC ROM for FORTH)
à
320 KB RAM
9.4 FRAM71B-1024 Example
This configuration utilizes TOP FRAM on a -1024 model to store ROM images of HRDFORTH,
FORTHROM, and MATHROM. It starts out with an all-RAM configuration:
"B3 B4 B5 93 00 00 …”
PORT(5.00): 32 KB TOP RAM; for HRDFRTH image, will later move to H_0xE0000
PORT(5.01): 32 KB TOP RAM; for FORTHROM image
PORT(5.02): 32 KB TOP RAM; for MATHROM
PORT(5.03): 32 KB BOT RAM; just RAM
Entry "B4" is 32 KB, although 16 KB would be sufficient to hold the FORTHROM. However,
TOP FRAM doesn't support 16 KB sizes, so 32 KB must be used. Then, the modules get filled
according to chapter 10.
Once CN2-5 is set, and power is cycled, the HP-71B re-orders the PORT numbers such that
the HC ROM at H_0xE0000 becomes invisible to SHOWPORT, the final configuration being:
"B3 F4 F5 93 00 00 …”
(Invisible) : 32 KB TOP RAM, marked as HC ROM and moved to H_0xE0000 by CN2-5
PORT(5.00): 32 KB TOP SC ROM, holding FRTHROM
PORT(5.01): 32 KB TOP SC ROM, holding MATHROM
PORT(5.02): 32 KB BOT RAM
1)
Only available on FRAM71B-1024
2)
In such a case, turn the HP-71B off, set jumper CN2-3, POKE the last known good configura-
tion to H_2C000, remove CN2-3, and power-cycle the HP-71B.
