#1 MEG Ram Expansion
4 messages in this thread
I upgraded my Amiga last night to 1 meg last night. Thanks for posting
the correction. I would not have noticed it. Works great! I made one
mistake. I nicked the wire from pin 3 on U1H (74F138) to pin 10 U1J
(74F399) and it broke without my noticing it. It would boot under 1.1 but
not 1.2. Would crash with addmem, otherwise ran fine in 512K mode.
Replaced wire and everything was fine.
Question, why does avail give the following results when system is booted
with 1.2 and 1.1 with addmem C00000 C7FFFF respectively?
Wb1.2 Wb1.1
Maximum Maximum
Chip 523232 524288
Fast 516888 524280 (not a typo)
Total 1040120 1048568
The reason for the "524280" must be that 8 bytes are used in FAST memory
to store some information after an addmem is done under 1.1 With
autoconfig, of course, there is even more taken away since a lot of system
stuff gets loaded directly into FAST.
Larry,
I thought that the column label maximum in avail meant the total
physical memory, not unallocated. Am I confused? Not much memory to quibble
over, just want to be sure everything is ok. Thanks.
John
John,
I don't remember what it did under 1.1 on my machine, but an AVAIL under 1.2
seems to give you a maximum that is really the maximum available for allocation
after boot-up. Notice the maximums in your example under 1.2, where you have
523232 CHIP and 516888 FAST. If this were indeed the maximum of all memory, the
numbers would be 524288 and the total would be 1048576.
Regards, Larry.